General technical data
7.3 Electromagnetic Compatibility
Fail-safe signal modules
64 Installation and Operating Manual, 01/2010, A5E00085586-10
Surge protection for S7-300/ET 200M with fail-safe signal modules
If your system requires a degree of protection higher than severity level 2, it is advisable to
install an external protective circuit in order to provide sufficient surge strength to an S7-
300/ET 200M with fail-safe signal modules.
The precise type name is available in
S7-300 Automation System, CPU 31xC and CPU 31x:
Installation
, chapter
Lightning and surge voltage protection
.
Note
Lightning protection measures always require individual assessment of the overall plant. The
maximum surge protection can only be achieved if the entire building of the plant is
interconnected with a surge protection system. This involves in particular structural
measures in the building design phase.
In order to obtain comprehensive information about surge protection, you should consult
your Siemens partner or a company specializing in lightning protection.
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