Strange behaviour of Analog Input Module - Siemens S7-300.

[JesperMP]

Check the ground from the AI common to the PSU common.

 

[aikona]

Can you reduce the milli-amp signal ( day to about 12 mAmp ) and see it it falls into range ( less than 27648 )
IF the input is 32000 and more it means you got in excess of 20 mAmp

Eric

 

[drspanda]

Power supply and ground connections.

Check the ground from the AI common to the PSU common.

The above is the wiring diagram...I have found the below readings:

V(L+,M) = 24.5V
V(E,M) = 13.8mV

I am sure with my measurement.

 

[drspanda]

Can you reduce the milli-amp signal ( day to about 12 mAmp ) and see it it falls into range ( less than 27648 )
IF the input is 32000 and more it means you got in excess of 20 mAmp

Eric

Yes I have done that way and found not compatible within the 0 to 27648.