Siemens CPU 312C Hardware And Installation Guide

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
12-27
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Overvoltage occurs when inductive devices are switched off. Examples are relay
coils and contactors.
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S7-300 digital output modules are equipped with an integrated surge arrester.
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Inductive devices require additional surge arresters only in following cases:
• If SIMATIC output circuits can be switched off by additionally installed contacts
(e.g. relay contacts).
• If the inductive loads are not controlled by SIMATIC modules
Note: Request information on relevant surge protection rating from the supplier of
inductive devices.
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The figures illustrates an output circuit requiring additional overvoltage protectors.
Contact in the output circuit
Inductivity requires circuiting
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Figure 12-8 EMERGENCY-OFF relay contact in the output circuit
Refer also to the rest of the information in this section.

Siemens CPU 312C Specifications

General

Brand	Siemens
Model	CPU 312C
Category	Processor
Language	English