Siemens S7-200 User Manual download pdf (Page 24)

Introduction

You will implement a pulse-operated switch here. Within this context, you

will learn about edge detection and bit memories.

Principle of operation

A lamp at output Q0.5 is to be switched

on as soon as S1 at input I0.0 is briefly

operated.

If S1 (I0.0) is operated again, Q0.5 drop

out and the lamp is to go off.

Whenever switch S1 is operated, Q0.5 is

to change its state.

This is a "pulse-operated switch".

Timing chart

Output Q0.5 is always to reverse its cur-

rent state once when the switch at I0.0

changes from "open" to "closed".

If the switch remains closed or open, no

change takes place.

Pulse-Operated Switch

- Introduction

- Solution Overview

- Edge Detection

- Bit Memories

- Solution Description and Test

24 V “true”

0 V “untrue”

“true”

“untrue”

I0.0

Q0.5

Pulse-Operated Switch

Latching Revision

Pulse-Oper-

ated Switch

Off-Delay

Timer

Sequencer Appendix

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 73 74

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Siemens S7-200 User Manual Page 24