Additional measures
If you want to connect an S7-400 system to the public network, you must ensure compliance
with class B pursuant to EN 55032.
Appropriate additional measures are to be taken if you need to increase the immunity of the
system in the light of high external interference.
General specifications
1.2 Electromagnetic compatibility
S7-400 Automation System Module Data
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Reference Manual, Ausgabe 11/2016, A5E00850736-08