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Simple example
2.4 Create program
STEP 7 Basic V10.5
36 Getting Started, 12/2009, A5E02651459-01
The representation of this programming language is based on circuit diagrams, i.e. each
LAD program of a block is divided into networks, each of which consists of one power rail
and at least one rung.
A network can be extended by adding additional rungs. You can use branches to program
parallel connections in the specific rungs. Rungs and networks are executed from top to
bottom and from left to right.
LAD instructions
You create the actual contents of the program using the LAD instructions that are available
in the "Instructions" task card of the user interface. There are three different types of LAD
instructions:
● Contacts: You can use contacts to create or interrupt a current-carrying connection
between two elements. In such cases the elements can be the LAD program elements or
the edges of the power rail. The current is relayed from left to right. You can use contacts
to query the signal state or the value of an operand and control it depending on the result
of the current flow.
● Coils: You use the coils to modify binary operands. Coils can set or reset a binary
operand depending on the signal state of the result of logic operation.
● Boxes: Boxes are LAD elements with complex functions. The empty box is an exception.
You can use the empty box as a placeholder in which you can select the required
operation.
In the "Instructions" task card you can find various variations of contacts, coils and boxes
that are sorted into various folders depending on their function. Most LAD instructions must
be supplied with tags.
The following figure shows an example of a programmed LAD network:
5
&RQWDFW &RQWDFW &RLO
&RLO
&RLO
$GGHGYDOXH
$GGHGYDOXH
6XP
(1
,1
,1
(12
287
(1
,QW
① Power rail
② Rung
③ Branch
④ Contact
⑤ Coil
⑥ Box
- SIMATIC 1
- TIA Portal 1
- STEP 7 Basic V10.5 1
- Legal information 2
- Table of contents 3
- 1.1 Overview 6
- 1.2 TIA Portal basics 7
- 7,$3RUWDO 8
- 8QLIRUPHQJLQHHULQJV\VWHP 8
- :LQ&&%DVLF9 8
- 67(3%DVLF9 8
- 1.2.3 Data management 9
- Library concept 10
- 1.3 Views in the TIA portal 11
- 1.3.2 Portal view 12
- 1.3.3 Project view 13
- TIA Portal Introduction 14
- 1.3 Views in the TIA portal 14
- 1.4 Example projects 15
- 1.4 Example projects 16
- 1.4.2 Loading a project 17
- TIA Portal Introduction 19
- 1.4 Example projects 19
- Simple example 21
- 2.3.1 Inserting a PLC 23
- Simple example 25
- Network view 26
- Device view 28
- 2.3.3 Configure PLC 29
- 2.4 Create program 31
- 2.4 Create program 33
- 2.4 Create program 34
- 2.4.4 What are networks? 35
- LAD instructions 36
- Normally open contact 37
- Negated coil 38
- 2.4.6 What are tags? 42
- PLC tag table 44
- 2.5 Test program 48
- 2.5 Test program 50
- 2.5 Test program 51
- Additional information 53
- +0, 3/& 3URFHVV 57
- Adding a new HMI device 58
- 2.6 Create HMI screen 59
- 2.6 Create HMI screen 60
- Graphic objects 65
- Use of graphic objects 65
- External HMI tags 66
- Internal HMI tags 77
- 2.7 Testing HMI screen 85
- 2.7.2 Simulate runtime 87
- 2.7 Testing HMI screen 88
- 3.1 Introduction 90
- 3.2 Expanding the program 91
- Normally closed contact 97
- Extended example 100
- 3.2 Expanding the program 100
- 2SHUDQG! 101
- Procedure 102
- Requirements 103
- Introduction 103
- Extended example 105
- 3.2 Expanding the program 105
- On delay 110
- Output coil 110
- 3.4 Expand HMI screen 123
- 3.4 Expand HMI screen 124
- 3.4 Expand HMI screen 129
- 3.5 Simulate HMI screen 132
- Testing in the HMI device 133
- 3.5 Simulate HMI screen 134
- 4.1 Introduction 135
- Use of the PID controller 136
- 4.1 Introduction 137
- STEP 7 Basic V10.5 140
- 4.4 Load simulation block 143
- 4.4 Load simulation block 144
- 4.4 Load simulation block 145
- 4.5 Configure PID controller 150
- Block name 151
- Parameter 151
- 4.8 Adjust HMI screen 158
- 4.8 Adjust HMI screen 159
- 4.8 Adjust HMI screen 160
- Controller optimization 161
- Example "Motion" 165
- Hardware configuration 166
- Example "Motion" 167
- 5.1 Introduction 167
- 5.4 Enable axis 173
- 5.4 Enable axis 174
- 5.4 Enable axis 175
- 5.5 Position axis relative 176
- 5.5 Position axis relative 177
- 5.5 Position axis relative 178
- 5.6 Expand HMI screen 180
- 5.6 Expand HMI screen 181
- 5.6 Expand HMI screen 184
- 5.7 Simulate HMI screen 189
- 5.7 Simulate HMI screen 190
- 5.8 Start diagnostics view 191
- 5.8 Start diagnostics view 192
- 5.8 Start diagnostics view 193
- Glossary 197
- Glossary 199
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