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I have a Simatic S7-400 PLC station with SM-431 analog input module (16 inputs with 13 bits ADCs). Hardware is configured for 4-20 mA two-wire current transducer. Raw word (IWxxx or PIWxxx) read from the address of any of the
inputs is incorrect, that is, always about 58 percent of the actual input current. Already tried grounding unused channels and swapping modules, which didn't help.
Gratefull for any tip.
inputs is incorrect, that is, always about 58 percent of the actual input current. Already tried grounding unused channels and swapping modules, which didn't help.
Gratefull for any tip.