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What is Overvoltage Protection of The S7-200 Analog Input Module about?

Overvoltage protection of the S7-200 analog input module. In order to protect the analog input module against overvoltage damage we recommend using a controlled power supply (SITOP power supply) If you use an uncontrolled power supply you can use a suppressor diode (very fast Z diode) This diode has to be connected in reverse direction parallel to the incoming terminals.

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