Siemens SIMATIC ET 200SP - Electromagnetic Compatibility of Fail-Safe Modules

Technical specifications
14.3 Electromagnetic compatibility of fail-safe modules
Distributed I/O system
278 System Manual, 09/2019, A5E03576849-AJ
14.3 Electromagnetic compatibility of fail-safe modules
Protecting ET 200SP with fail-safe modules against overvoltages
If your equipment requires protection from overvoltage, we recommend that you use an
external protective circuit (surge filter) between the load voltage power supply and the load
voltage input of the BaseUnits to ensure surge immunity for the ET 200SP with fail-safe
modules.
Note
Overvoltage protection measures always require a case
-by-case examination of the entire
plant. Almost complete protection from overvoltages, however, can only be achieved if the
entire building surroundings have been designed for overvoltage protec
tio
n. In particular, this
involves structural measures in the building design phase.
For detailed information regarding overvoltage protection, we recommend that you contact
your Siemens representative or a company specializing in lightning protection.