Siemens S7-200 User Manual download pdf (Page 51)

Important Safety Points (1)

The program section shown in the example must be at the end of the "normal" tran-

sition conditions of the sequencer. This ensures that any necessary shutdown can

take place prior to activating the outputs.

Sequencer

Sequential control

- Introduction

- Basics

- Working with Sequencers

- Modification

- Solution Description, Example

- Test

SM0.1 supplies

"1" for one

cycle in the first

cycle after

restarting

There should be not drives or valves active in the first step flag

(initial situation). In our example, this is step 0 or step flag M0.0.

When "STOP" is operated or a motor protector picks

up, the first step flag (M0.0 in our example) need

only be set for all drives to come to a stop. At the

same time, all other step flags must be reset.

M0.0 is set, M0.1 to M0.5 are reset

- in the first cycle after power

restore by SM0.1 or

- if I0.0="0" or

- if I0.5="0".

LatchingRevision

Pulse-Oper-

ated Switch

Off-Delay

Timer

Sequencer Appendix

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 73 74

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Siemens S7-200 User Manual Page 51