I have a S7-1200 with a SM1231- 8AI-13BIT  that should read a signal in current (4..20 mA) on channel 0  first every thing working correctly .but after wiring the system it doesn't  also read input value and doesn't display any error.

I have tested the signal with gauge and it read correctly .

I tried all the other inputs on the module but the result is the same

can help me

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Split from AI module SM 1231 doesn't read input value and has no errors.