Siemens S7-200 User Manual download pdf (Page 71)

68

Index K...S

Index

For reference, cross

references to manuals

and abbreviations.

$

K

L

Ladder diagram: 1h-& 25

Ladder status: 7, 1h-

& 26

Latching function solution: 15 +

Latching: 13 +

M

MB: Memory byte (8 bits)

MD: Memory double-word (32 bits)

Mode selector switch: Switch on the S7-200

with three settings: STOP, TERM, RUN.

MW: Memory word (16 bits)

N

Normally-closed (NC) contact: 14, 15

Normally-open (NO) contact: 8

O

OB1: Organization block of the S7-200

Off-delay timer solution: 29 +

Off-delay timer: 29 ff.

On-delay timer: 1h-

& 35

On-line Help: 8

Organization block:

contains the cyclically executed user

program of the controller

P

PIQ: Process-image output table: 10

PII: Process-image input table: 9

PLC: Programmable logic controller.

Process-image: A PLC program works on an

I/O image. At the start of the cycle, the

input image is read in and at the end of

the cycle the output image is transferred

to the actual outputs: 9 +

Pulse-operated switch solution: 21 +

Pulse-operated switch: 21 +

R

Reset, Set: 16 +

RET: Return, end subroutine

Retentivity: 23

RUN: Position of the S7-200’s mode selector

switch for manual startup/restart of the

controller

S

Safety aspects: 19

Saving the program: 1h-

& 41

SBR: Subroutine,

Semi-automatic controller: Controller that can

execute certain sequences autonomously

but depends on user inputs at other points.

Sequencer solution: 39 +

Sequencer: Usually self-contained sequence

of steps that is processed step-by-step in a

sequential control: 39 +

Sequential control: Control that derives steps

from events or makes transitions between

steps. These, in turn, activate prescribed

actions.

Set, reset: 17 +

SMB: Special memory byte (8 bits), e.g.

SMB28

SMB28: Potentiometer of the S7-200

SMD: Special memory double-word (32 bits)

SMW: Special memory word (16 bits)

Status in the ladder diagram: 1h-

& 26

Status: Permits monitoring of a process on the

program level or in a special status table.

Useful for test and diagnostics.

Step flag: 41

STL: Statement list

STOP: Position of the S7-200’s mode selector

switch for manual stopping of the controller.

B2

Appendix

Latching Revision

Pulse-Oper-

ated Switch

Off-Delay

Timer

Sequencer Appendix

1 2 ... 66 67 68 69 70 71 72 73 74

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