Interference-Free Operation; Special Measures For Interference-Free Operation - Siemens SIMATIC ET 200S Operating Instructions Manual

Interference-free operation

D.1

Special Measures for Interference-Free Operation

Inductive voltages
Overvoltage occurs when sources of inductance are switched off. Examples of this are relay
coils and contactors.
Integrated overvoltage protection
The digital output modules of the ET 200S have an integrated overvoltage protection device.
Additional overvoltage protection
Inductance must only be connected to additional overvoltage protective devices in the
following cases:
● If digital output circuits can be switched of by additionally installed contacts
● If the inductance cannot be controlled by digital output modules.
Note: Inquire about how the respective overvoltage protective devices must be dimensioned
from your inductance supplier.
ET 200S
Operating Instructions, 08/2008, A5E00515771-06
(e. g. relay contacts).
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