Appendix; General Rules And Regulations For S7-300 Operation; A.1 General Rules And Regulations For S7-300 Operation - Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual

Appendix

A.1

General rules and regulations for S7-300 operation

Introduction
Seeing that an S7-300 can be used in many different ways, we can only describe the basic
rules for the electrical installation in this document.
Warning
Always observe these basic rules for electrical installation in order to achieve a fully
functional S7-300 system.
EMERGENCY-OFF equipment
EMERGENCY-OFF equipment to IEC 204 (corresponds to VDE 113) must remain effective
in all operating modes of the plant or system.
System startup after specific events
The table below shows what you have to observe when restarting a plant after specific
events.
Table A-1
If there is...
Restart following a voltage dip or power failure,
Startup after releasing the EMERGENCY OFF
device,
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
System startup after specific events
then ...
dangerous operating states must be excluded. If
necessary, force EMERGENCY-OFF.
uncontrolled or undefined startup operations must
be excluded.
A
A-1