Preface, ContentsPart 1: Working with theLadder EditorPart 2: Language DescriptionAppendixGlossary, IndexC79000-G7076-C504-02Ladder Logic (LAD) for S7
xLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212 Floating-Point Math Instructions 12-1. . . . . . . . . . . . . . . . . . . . . . . . .
8-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.1 OverviewBit logic instructions work with two digits, 1 and 0. These two digits form
8-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.2 Normally Open ContactYou can use the Normally Open Contact (Address) instruction to
8-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.3 Normally Closed ContactYou can use the Normally Closed Contact (Address) instructio
8-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.4 Output CoilThe Output Coil instruction works like a coil in a relay logic diagram.
8-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.5 Midline OutputThe Midline Output instruction is an intermediate assigning element t
8-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.6 Invert Power FlowThe Invert Power Flow instruction negates the RLO.Table 8-5 Invert
8-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.7 Save RLO to BR MemoryThe Save RLO to BR Memory instruction saves the RLO to the BR
8-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.8 Set CoilThe Set Coil instruction is executed only if the RLO = 1. If the RLO = 1, t
8-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.9 Reset CoilThe Reset Coil instruction is executed only if the RLO = 1. If the RLO =
8-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.10 Set Counter ValueYou can use the Set Counter Value (SC) instruction to place a pr
xiLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215 Word Logic Instructions 15-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.11 Up Counter CoilThe Up Counter Coil (CU) instruction increments the value of a spe
8-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.12 Down Counter CoilThe Down Counter Coil (CD) instruction decrements the value of a
8-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.13 Pulse Timer CoilThe Pulse Timer Coil (SP) instruction starts a specified timer wi
8-15Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.14 Extended Pulse Timer CoilThe Extended Pulse Timer Coil (SE) instruction starts a
8-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.15 On-Delay Timer CoilThe On-Delay Timer Coil (SD) instruction starts a specified ti
8-17Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.16 Retentive On-Delay Timer CoilThe Retentive On-Delay Timer Coil (SS) instruction s
8-18Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.17 Off-Delay Timer CoilThe Off-Delay Timer Coil (SF) instruction starts a specified
8-19Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.18 Positive RLO Edge DetectionThe operation Positive RLO Edge Detection recognizes a
8-20Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.19 Negative RLO Edge DetectionThe operation Negative RLO Edge Detection recognizes a
8-21Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.20 Address Positive Edge DetectionThe Address Positive Edge Detection instruction co
xiiLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02AppendixA Alphabetical Listing of Instructions A-1. . . . . . . . . . . . . . . . . . .
8-22Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.21 Address Negative Edge DetectionThe Address Negative Edge Detection instruction co
8-23Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.22 Set Reset FlipflopThe Set Reset Flipflop instruction executes Set (S) and Reset (
8-24Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.23 Reset Set FlipflopThe Reset Set Flipflop instruction executes Set (S) and Reset (
9-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Timer InstructionsSection Description Page9.1 Location of a Timer in Memory and Compone
9-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-029.1 Location of a Timer in Memory and Components of a TimerTimers have an area reserved
9-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Because time values are stored with only one time interval, values that arenot exact mu
9-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-029.2 Choosing the Right TimerFigure 9-2 provides an overview of the five types of timers
9-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-029.3 Pulse S5 TimerThe Pulse S5 Timer instruction starts a specified timer if there is a
9-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 9-3 shows the Pulse S5 Timer instruction, describes the status wordbits, and sho
9-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-029.4 Extended Pulse S5 TimerThe Extended Pulse S5 Timer instruction starts a specified t
Product Overview1Introduction2Creating Logic Blocks3Creating Data Blocks andUser Data Types4Editing the Block Properties and Testing the Program5Part
9-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 9-4 shows the Extended Pulse S5 Timer instruction, describes thestatus word bits
9-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-029.5 On-Delay S5 TimerThe On-Delay S5 Timer instruction starts a specified timer if ther
9-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02–– t –– –– t ––t = programmed timeIf the signal state of input I 0.0 changes from 0 to
9-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-029.6 Retentive On-Delay S5 TimerThe Retentive On-Delay S5 Timer instruction starts a sp
9-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 9-6 shows the Retentive On-Delay S5 Timer instruction, describes thestatus word
9-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-029.7 Off-Delay S5 TimerThe Off-Delay S5 Timer instruction starts a specified timer if t
9-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 9-7 shows the Off-Delay S5 Timer instruction, describes the statusword bits, an
10-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Counter InstructionsSection Description Page10.1 Location of a Counter in Memory and C
10-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0210.1 Location of a Counter in Memory and Components of a CounterCounters have an area
10-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0210.2 Up-Down CounterA positive edge (i.e. a change in signal state from 0 to 1) at inp
1-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02
10-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 10-2 Up-Down Counter Box and Parameters, with SIMATIC Short NameLAD Box Paramete
10-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0210.3 Up CounterA positive edge (i.e. a change in signal state from 0 to 1) at input S
10-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 10-4 Up Counter Box and Parameters, with SIMATIC Short NameLAD Box Parameter Dat
10-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0210.4 Down CounterA positive edge (that is, a change in signal state from 0 to 1) at in
10-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 10-6 Down Counter Box and Parameters, with SIMATIC Short NameLAD Box Parameter D
11-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Integer Math InstructionsSection Description Page11.1 Add Integer 11-211.2 Add Double
11-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.1 Add IntegerA signal state of 1 at the Enable (EN) input activates the Add Integer
11-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.2 Add Double IntegerA signal state of 1 at the Enable (EN) input activates the Add
11-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.3 Subtract IntegerA signal state of 1 at the Enable (EN) input activates the Subtra
11-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.4 Subtract Double IntegerA signal state of 1 at the Enable (EN) input activates the
1-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Product OverviewLAD stands for Ladder Logic. LAD is a graphic programming language. The
11-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.5 Multiply IntegerA signal state of 1 at the Enable (EN) input activates the Multip
11-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.6 Multiply Double IntegerA signal state of 1 at the Enable (EN) input activates the
11-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.7 Divide IntegerA signal state of 1 at the Enable (EN) input activates the Divide I
11-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.8 Divide Double IntegerA signal state of 1 at the Enable (EN) input activates the D
11-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.9 Return Fraction Double IntegerA signal state of 1 at the Enable (EN) input activ
11-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0211.10 Evaluating the Bits of the Status Word After Integer MathInstructionsThe basic
11-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Integer Math Instructions
12-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Floating-Point Math InstructionsSection Description Page12.1 Overview 12-212.2 Add Flo
12-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.1 OverviewYou can use the floating-point math instructions to perform the following
12-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.2 Add Floating-Point NumbersA signal state of 1 at the Enable (EN) input activates
1-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02
12-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.3 Subtract Floating-Point NumbersA signal state of 1 at the Enable (EN) input activ
12-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.4 Multiply Floating-Point NumbersA signal state of 1 at the Enable (EN) input activ
12-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.5 Divide Floating-Point NumbersA signal state of 1 at the Enable (EN) input activat
12-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.6 Evaluating the Bits of the Status Word After Floating-PointInstructionsThe math i
12-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.7 Establishing the Absolute Value of a Floating-Point NumberWith the Establishing t
12-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.8 Establishing the Square and/or the Square Root of a Floating-PointNumberWith the
12-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Status Word Bits BR CC 1 CC 0 OV OS OR STA RLO FCWrite x x x x x 0 x x 1Function is e
12-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.9 Establishing the Natural Logarithm of a Floating-Point NumberWith the Establishi
12-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.10 Establishing the Exponential Value of a Floating-Point NumberWith the Establish
12-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0212.11 Establishing the Trigonometrical Functions of Angles asFloating-Point NumbersWi
2-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02IntroductionThis chapter is a brief description of the structure of a user programconsi
12-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 12-13 Box ASIN and ParametersLAD Box Parameter DataTypeMemoryAreaDescriptionASI
12-15Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 12-16 Box TAN and ParametersLAD Box Parameter DataTypeMemoryAreaDescriptionTANE
12-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Floating-Point Math Instructions
13-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Comparison InstructionsSection Description Page13.1 Compare Integer 13-213.2 Compare D
13-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0213.1 Compare IntegerThe Compare Integer instruction carries out a compare operation on
13-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0213.2 Compare Double IntegerThe Compare Double Integer instruction carries out a compar
13-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Status Word Bits BR CC 1 CC 0 OV OS OR STA RLO FCWrite – x x 0 – x 1 x 1I 0.1Output Q
13-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0213.3 Compare Floating-Point NumbersThe Compare Floating-Point Numbers instruction trig
13-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Comparison Instructions
14-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Move and Conversion InstructionsSection Description Page14.1 Assign a Value 14-214.2 B
2-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-022.1 Structure of User ProgramsA user program consists of logic blocks and data blocks.
14-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.1 Assign a ValueThe Assign a Value instruction enables you to pre-assign a variable
14-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02For information on integrated system functions that act as move instructionswhich can
14-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.2 BCD to IntegerThe BCD to Integer conversion instruction reads the contents specif
14-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.3 Integer to BCDThe Integer to BCD conversion instruction reads the contents specif
14-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.4 Integer to Double IntegerThe Integer to Double Integer conversion instruction rea
14-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.5 BCD to Double IntegerThe BCD to Double Integer conversion instruction reads the c
14-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.6 Double Integer to BCDThe Double Integer to BCD conversion instruction reads the c
14-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.7 Double Integer to Floating-Point NumberThe Double Integer to Floating-Point Numbe
14-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.8 Ones Complement IntegerThe Ones Complement Integer instruction reads the content
14-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.9 Ones Complement Double IntegerThe Ones Complement Double Integer instruction rea
2-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02You can also define your own data:S You can define shared data in data blocks. This dat
14-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.10 Twos Complement Integer The Twos Complement Integer instruction reads the cont
14-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.11 Twos Complement Double IntegerThe Twos Complement Double Integer instruction re
14-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.12 Negate Floating-Point NumberThe Negate Floating-Point Number instruction reads
14-15Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.13 Round to Double IntegerThe Round to Double Integer conversion instruction reads
14-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.14 Truncate Double Integer PartThe Truncate Double Integer Part conversion instruc
14-17Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.15 CeilingThe Ceiling conversion instruction reads the contents specified in the i
14-18Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0214.16 FloorThe Floor conversion instruction reads the contents specified in the input
15-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Word Logic InstructionsSection Description Page15.1 Overview 15-215.2 WAnd Word 15-315
15-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215.1 OverviewWord logic instructions compare pairs of words (16 bits) and double words
15-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215.2 WAnd WordA 1 at the Enable (EN) input activates the (Word) And Word instruction.
iiLadder Logic (LAD) for S7-300 and S7-400C79000 G7076 C504 02This manual contains notices which you should observe to ensure your own personal safety
2-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-022.2 Creating User Programs – OverviewA user program that runs on an S7 CPU is essential
15-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215.3 WAnd Double WordA 1 at the Enable (EN) input activates the (Word) And Double Word
15-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215.4 WOr WordA 1 at the Enable (EN) input activates the (Word) Or Word instruction. Th
15-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215.5 WOr Double WordA 1 at the Enable (EN) input activates the (Word) Or Double Wordin
15-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215.6 WXOr WordA 1 at the Enable (EN) input activates the (Word) Exclusive Or Wordinstr
15-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215.7 WXOr Double WordA 1 at the Enable (EN) input activates the (Word) Exclusive Or Do
16-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Shift and Rotate InstructionsSection Description Page16.1 Shift Instructions 16-216.2
16-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0216.1 Shift InstructionsYou can use the Shift instructions to move the contents of inpu
16-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215... ...8 7... ...00 1 0 10 1 0 1 0 1 0 10 0 0 00 1 0 01 1 0 1INNOU
16-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A signal state of 1 at the Enable (EN) input activates the Shift Left DoubleWord instr
16-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A signal state of 1 at the Enable (EN) input activates the Shift Right Wordinstruction
2-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02FilePress F1 for helpOptions HelpSIMATIC Manager – TRAFFICNUMTRAFFIC - <Offline>
16-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A signal state of 1 at the Enable (EN) input activates the Shift Right DoubleWord inst
16-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Status Word Bits BR CC 1 CC 0 OV OS OR STA RLO FCWrite x x x x – x x x 1I 0.0A signal
16-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0215... ...8 7... ...01 0 1 00 0 0 0 1 0 1 01 0 1 01
16-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A signal state of 1 at the Enable (EN) input activates the Shift Right DoubleInteger i
16-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0216.2 Rotate InstructionsYou can use the Rotate instructions to rotate the entire cont
16-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 16-7 Rotate Left Double Word Box and ParametersLAD Box Parameter Data Type Memo
16-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-021 0 131... ...16 15... ...01 0 1 01 0 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 1 0 1 0 1
17-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Data Block InstructionsSection Description Page17.1 Open Data Block: DB or DI 17-2Chap
17-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0217.1 Open Data Block: DB or DIYou can use the Open Data Block: DB or DI instruction to
18-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Jump InstructionsSection Description Page18.1 Overview 18-218.2 Jump in the Block If R
2-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02When you save a block in the Editor, remember the following points:S File " Save a
18-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0218.1 OverviewThe address of a Jump instruction is a label. A label consists of a maxim
18-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0218.2 Jump in the Block If RLO = 1 (Unconditional Jump)The Unconditional Jump instructi
18-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0218.3 Jump in the Block If RLO = 1 (Conditional Jump)The Conditional Jump instruction c
18-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0218.4 Jump in the Block If RLO = 0 (Jump-If-Not)The Jump-If-Not instruction corresponds
18-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0218.5 LabelLABEL is the identifier for the destination of a jump instruction. For every
19-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Status Bit InstructionsSection Description Page19.1 Overview 19-219.2 Exception Bit BR
19-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0219.1 OverviewThe status bit instructions are bit logic instructions (see Section 8.1)
19-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0219.2 Exception Bit BR MemoryYou can use the Exception Bit BR Memory instruction to che
19-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0219.3 Result BitsYou can use the Result Bit instructions to determine the relationship
19-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Status Word Bits BR CC 1 CC 0 OV OS OR STA RLO FCWrite – – – – – x x x 1I 0.0If the si
2-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-022.3 Rules to ObserveThe order in which you create logic blocks and data blocks in a use
19-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0219.4 Exception Bits UnorderedYou can use the Exception Bit Unordered instruction to ch
19-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0219.5 Exception Bit OverflowYou can use the Exception Bit Overflow instruction to recog
19-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Status Word BitsI 0.0If the signal state at input I 0.0 is 1, the SUB_Ibox is activate
19-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0219.6 Exception Bit Overflow StoredYou can use the Exception Bit Overflow Stored instru
19-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Status Word Bits BR CC 1 CC 0 OV OS OR STA RLO FCWrite – – – – – x x x 1I 0.0If the s
20-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Program Control InstructionsSection Description Page20.1 Calling FCs/SFCs from Coil 20
20-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0220.1 Calling FCs/SFCs from CoilYou can use the Call FC/SFC from Coil instruction to ca
20-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02OPNIf the unconditional call of FC10 is executed, the CALL instruction performs the fo
20-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0220.2 Calling FBs, FCs, SFBs, SFCs, and Multiple InstancesYou can call function blocks
20-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The enable output (ENO) of a Ladder box corresponds to the BR bit of thestatus word (s
2-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Introduction
20-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The parameters that have been defined in the VAR section of the block willbe displayed
20-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0220.3 ReturnYou can use the Return instruction to abandon blocks. You can abandon abloc
20-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0220.4 Master Control Relay InstructionsThe Master Control Relay (MCR, see also Section
20-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0220.5 Master Control Relay Activate/DeactivateWith the instruction Activate Master Cont
20-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02OB1MCRAMCRDMCRAMCRAMCRAMCRDBEUBEUOperations dependent on the MCR bitOperations not de
20-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The instruction ––(MCRA) activates the function MCR up to the next MCRD. The instruct
20-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-0220.6 Master Control Relay On/OffThe Master Control Relay On (MCR<) instruction tri
20-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02 RLORLORLOMSP !MAMCRA MCRD10""12345678RLO Pushed bit#"#"MSP = MCR
20-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02When the MCRA instruction activates the MCR function, you can create up to eight nest
Alphabetical Listing ofInstructionsAProgramming ExamplesBNumber RepresentationCReferencesDAppendix
3-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Creating Logic BlocksA user program cannot exist without logic blocks. In many situatio
T-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02
A-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Alphabetical Listing of InstructionsSection Description PageA.1 Listing with Internatio
A-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A.1 Listing with International NamesTable A-1 provides an alphabetical listing of instr
A-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-1 Ladder Logic Instructions Arranged Alphabetically by International Name, with
A-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-1 Ladder Logic Instructions Arranged Alphabetically by International Name, with
A-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A.2 Listing with International Names and SIMATIC EquivalentsTable A-2 provides an alpha
A-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-2 Ladder Logic Instructions Arranged Alphabetically by International Name,with
A-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-2 Ladder Logic Instructions Arranged Alphabetically by International Name,with
A-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-2 Ladder Logic Instructions Arranged Alphabetically by International Name,with
A-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A.3 Listing with SIMATIC NamesTable A-3 provides an alphabetical listing of instruction
3-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.1 Creating Logic Blocks – OverviewLogic blocks (OBs, FBs, FCs) are made up of a varia
A-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-3 Ladder Logic Instructions Arranged Alphabetically by SIMATIC Name, with Shor
A-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-3 Ladder Logic Instructions Arranged Alphabetically by SIMATIC Name, with Shor
A-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A.4 Listing with SIMATIC Names and International EquivalentsTable A-4 provides an alph
A-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-4 Ladder Logic Instructions Arranged Alphabetically by SIMATIC Name, with Inte
A-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-4 Ladder Logic Instructions Arranged Alphabetically by SIMATIC Name, with Inte
A-15Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table A-4 Ladder Logic Instructions Arranged Alphabetically by SIMATIC Name, with Inte
A-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A.5 Listing with International Short Names and SIMATIC Short NamesTable A-5 provides a
B-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Programming ExamplesSection Description PageB.1 Overview B-2B.2 Bit Logic Instructions
B-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02B.1 OverviewEach ladder logic instruction described in this manual triggers a specifico
B-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02B.2 Bit Logic InstructionsFigure B-1 shows a conveyor belt that can be activated electr
3-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.2 Logic Blocks in the EditorBefore you start programming in the LAD Editor, you shoul
B-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02You can write a program to control the conveyor belt shown in Figure B-1using absolute
B-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure B-3 shows a conveyor belt that is equipped with two photoelectricbarriers (PEB1
B-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table B-4 Elements of Absolute Programming for Detecting DirectionSystem ComponentAbsol
B-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02B.3 Timer InstructionsYou can use a clock pulse generator or flasher relay when you nee
B-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02MW100M0.2 T 1SES5T#250MSM0.2Network 1: If the signal state of timer T 1 is 0, load the
B-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A signal check of timer T 1 produces the result of logic operation (RLO, seeSection 6.2
B-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table B-5 Frequencies for Clock Pulse Timer ExampleBits ofMB101/MB100DurationFrequency
B-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02B.4 Counter and Comparison InstructionsFigure B-9 shows a system with two conveyor bel
B-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02MW200I12.0Q12.1Network 1: Counter C1 counts up at each signal change from “0” to “1” a
B-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02B.5 Integer Math InstructionsThe sample program in Figure B-11 shows you how to use th
3-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02When you open a logic block, a window appears displaying the following:S The variable d
B-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02B.6 Word Logic InstructionsThe operator of the oven shown in Figure B-12 starts the ov
B-15Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02T 1“Heating starts”Q 4.0RETNetwork 1: If the timer is running, then turn on the heater
B-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Programming Examples
C-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Number NotationSection Description PageC.1 Number Notation C-2Chapter OverviewC
C-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02C.1 Number NotationLadder logic instructions work with data objects of specific sizes (
C-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table C-2 Constant Formats for Elementary Data TypesType andDescriptionSizeinBitsFormat
C-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table C-3 Integer RangeFormat Range16-bit integer -32,768 to +32,7671 1 0 0037
C-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table C-5 Real Number RangesFormat Range1Real numbers-3.402823E+38 to -1.175495E-38and
C-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Real numbers (also called floating-point numbers) of the basic format, singlewidth, are
C-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure C-4 shows the real number format for the following decimal values:S 10.0S (3.1
3-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 3-1 Relationship between Variable Declaration and Code SectionAction in the Varia
C-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The binary coded decimal (BCD) format represents a decimal number byusing groups of bin
C-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02When you enter time duration using the S5TIME data type, your entries arestored in bina
C-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The following examples show the syntax for the date and time for Thursday,December 25,
D-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02References/30/ Primer: S7-300 Programmable Controller,Quick Start/70/ Manual: S7-300 Pr
D-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02/270/ Manual: S7-PDIAG for S7-300 and S7-400“Configuring Process Diagnostics for LAD, S
Glossary-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02GlossaryAAbsolute addressing specifies the location of the address which is curr
Glossary-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02BThe bit result is the link between bit and word-oriented processing. This is an
Glossary-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02DData blocks are areas in a user program which store user data. There areshared
Glossary-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02FFirst check of the result of logic operation.A folder on the user interface of
Glossary-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02When a block is input incrementally, each line or element is checkedimmediately
iiiLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02PrefaceThis manual is your guide to creating user programs in the Ladder Logic(LAD) pro
3-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.3 Structure of the Variable Declaration TableIn the variable declaration table, you s
Glossary-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A logic string is that portion of a user program which begins with an FC bitthat
Glossary-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02OThe OR bit is needed if you perform a logical AND before OR operation.The OR bi
Glossary-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02SA container for user programs, source files, and charts for S7 programmablecont
Glossary-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The status word is part of the register of the CPU. It contains statusinformatio
Glossary-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The user program contains all the statements and declarations and all the dataf
Index-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02IndexSymbols(Word) And Double Word (WAND_DW)instruction, 15-4–15-5(Word) And Word (
Index-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02ADD_I. See Add Integer math instructionADD_R. See Add Real floating-point mathinstr
Index-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Branch, creating, 3-21Byteas data type, C-2range, 7-3, C-3CCall environment, 5-7See
Index-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Count valueformat, 10-2range, 10-2Countersarea in memory, 10-2count valueformat, 10
Index-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02EEdge detection, 8-19–8-25Edit, the variable declaration table, 4-5Editing, variabl
3-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The columns in the variable declaration table are interpreted as follows:Table 3-2 Colu
Index-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02shift, 16-2–16-13shift and rotate, 16-2–16-18status bit, 19-2–19-12that evaluate th
Index-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Midline Output ––(#)–– instruction, 8-6–8-7MOD_DI. See Return Fraction Double Integ
Index-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02POS. See Address Positive Edge DetectioninstructionPositive RLO Edge Detection ––(P
Index-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Set Coil ––(S) instruction, 8-9Set Counter Value ––(SC) instruction, 8-11Set Reset
Index-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02System function blocks. See SFBSystem function blocks (SFBs)calling SFBs from a bo
Index-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02WOR_DW. See (Word) Or Double WordinstructionWOR_W. See (Word) Or Word instructionW
Index-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Index
Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-021✄Siemens AGAUT E 146Östliche Rheinbrückenstr. 50D–76181 KarlsruheFederal Republic of Germ
2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Additional comments:_____________________________________________________________________
3-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.4 Editing Variable Declaration Tables – OverviewAfter you have entered the required d
3-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02To enter an array as a data type, enter the name in the “Symbol” column andthe keyword
3-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.5 Declaring Multiple InstancesA multiple instance results from declaring a static va
3-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.6 Assigning System Attributes for ParametersYou can assign system attributes to bloc
3-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 3-3 System Attributes for Parameters, continuedAttribute PermittedDeclaration ty
3-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.7 Editing the Code Section – OverviewIn the code section you describe the program se
3-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The order in which you perform each of the following steps is not fixed.When programmi
3-15Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.8 Basic Guidelines for Entering Ladder Logic InstructionsA Ladder network can contai
ivLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02There is a wide range of both general and task-oriented user documentationavailable to s
3-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02You cannot create branches that cause a short circuit. Figure 3-9 shows anexample:I 1.
3-17Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Some coils require preceding logic and some coils cannot accept precedinglogic.S Coils
3-18Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.9 Entering Ladder ElementsTo select a network to allow you to enter LAD elements, cl
3-19Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02The following options are available for inserting Ladder elements:S Enter a normally o
3-20Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02NoteIf you select the group “FB Blocks”or “FC Blocks” in the “ProgramElements” list bo
3-21Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.10 Creating Parallel BranchesTo create OR instructions in the Ladder programming lan
3-22Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02M2.0I1.0M2.0I1.0M2.0I1.0??.?I1.0??.?M2.0Step 1.Step 2.Step 3.Step 4.or <F8>or &l
3-23Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.11 Editing Addresses and ParametersThe Block Editor uses the character string ??:? a
3-24Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.12 Symbolic AddressingIn the Ladder programming language you can either enter absolu
3-25Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02PROJ1\...\FB53-<Offline>”lampon””sensor1” ”button2”Symbol Information:I0.0 senso
vLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 1-1 Summary of the DocumentationTitleSubjectS7-300 ProgrammableControllerQuick Star
3-26Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.13 Editing in the Overwrite ModeIn the Block Editor you can change addresses or para
3-27Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02If at one point in a branch one parallel branch closes and another one opens,this is c
3-28Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-023.14 Entering Titles and CommentsIn the code section of a logic block, you can enter i
4-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Creating Data Blocks and User-DefinedData TypesData blocks are an important part of you
4-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-024.1 Creating Data Blocks – OverviewData blocks (DBs) are used to handle data which is w
4-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02NoteWhen you change the declaration section of an FB, you have to recreate allthe insta
4-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-024.2 Selecting a MethodWhen you create a DB in the SIMATIC Manager or in the LAD Editor,
4-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-024.3 Editing the Declaration TableWhen you create single shared data blocks or UDTs, you
4-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-024.4 Editing Actual Data ValuesWhen you create and save a data block for the first time,
4-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02You can overwrite the actual values in the “Actual Value” column. Thevalues you enter m
viLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02To use the LAD effectively, you should already be familiar with the theorybehind S7 prog
4-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-024.5 Creating User-Defined Data Types (UDTs)User-defined data types are data structures
4-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02UDT56 - <Offline>Address Symbol Data Type Initial Value Commentspeedruntimemotor_
4-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Creating Data Blocks and User-Defined Data Types
5-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Editing the Block Properties and Testingthe ProgramAfter you have created and edited th
5-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-025.1 Editing the Block PropertiesThe block properties contain additional information abo
5-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Blocks with a name and family are easier to classify. For example you couldallocate som
5-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02NoteAttributes such as block protection, write protection and unlinked can onlybe added
5-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-025.2 Testing your Ladder Program - OverviewYou can test your Ladder program by visually
5-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-025.3 Setting the Program StatusBefore starting the Ladder program test, you select the c
5-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-025.4 Setting the Trigger ConditionsBy setting the trigger condition you select the call
viiLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02ContentsPreface iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-025.5 Choosing a Test Environment and Starting/Stopping the ProgramStatusThere are two wa
5-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Activating the test mode increases the scan time. If the set scan time isexceeded, the
5-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Editing the Block Properties and Testing the Program
Configuration andElements of Ladder Logic6Addressing7Bit Logic Instructions8Timer Instructions9Counter Instructions10Integer Math Instructions11Floati
5-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02
6-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Configuration and Elements of LadderLogicSection Description Page6.1 Elements and Box S
6-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-026.1 Elements and BoxesLadder instructions consist of elements and boxes which are conne
6-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02STEP 7 represents some ladder logic instructions as boxes with linesindicating inputs a
6-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 6-5 Memory Areas and Their FunctionsName of AreaFunction of AreaAccess to AreaNam
6-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 6-6 lists the maximum address ranges for various memory areas. Forthe address ran
viiiLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-024 Creating Data Blocks and User-Defined Data Types 4-1. . . . . . . . . . . . . . . .
6-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-026.2 Boolean Logic and Truth TablesA ladder logic program tracks power flow between powe
6-7Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 6-2 shows two representations of a relay logic circuit with one contactbetween a
6-8Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 6-3 shows a logic string of Ladder instructions that represents twonormally open
6-9Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 6-3 shows a ladder logic diagram that you can use to program twonormally open co
6-10Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Figure 6-4 shows a logic string of Ladder instructions that represent twonormally open
6-11Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02 Figure 6-4 shows a ladder logic diagram that you can use to program twonormally open
6-12Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-026.3 Significance of the CPU Registers in InstructionsRegisters help the CPU perform lo
6-13Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Bit 0 of the status word is called the first-check bit (FC bit, see Figure 6-6).At the
6-14Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Bit 2 of the status word is called the status bit (STA bit, see Figure 6-6). Thestatus
6-15Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Tables 6-10 through 6-15 list the significance of CC 1 and CC 0 after yourprogram exec
ixLadder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-028.15 On-Delay Timer Coil 8-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-16Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 6-13 CC 1 and CC 0 after Comparison InstructionsCC 1CC 0 Explanation0 0 IN2 = IN
6-17Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02!WarningPossible unintentional resetting of the BR bit to 0.When writing FBs and FCs i
6-18Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Configuration and Elements of Ladder Logic
7-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02AddressingSection Description Page7.1 Overview 7-27.2 Types of Addresses 7-4Chapter Ove
7-2Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-027.1 OverviewMany ladder logic instructions work together with one or more addresses(ope
7-3Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Table 7-1 Constant Formats for Immediate Addressing Using Addresses of Elementary Data
7-4Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-027.2 Types of AddressesAn address of a ladder logic instruction can indicate any of the
7-5Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02A pointer is a device that identifies the location of a variable. A pointercontains an
7-6Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Addressing
8-1Ladder Logic (LAD) for S7-300 and S7-400C79000-G7076-C504-02Bit Logic InstructionsSection Description Page8.1 Overview 8-28.2 Normally Open Contact
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