We have an AIO module with 4 input signals - all of them - 4-20Ma - same sensors. Channels 2,3 and 4 are working fine but we cannot see anything from Ch_1. We swaped the sensors to be sure that we have signals comming from them.
It seems the Ch_1 doesnt work. Is there any tool or way to check / test the input channel if it is faulty ?