S7 400H Redundant I/O problems

I'm facing problem in the redundant I/O's and CPU (S7 414H). We are using the Analog Module 6ES7431-0HH00-0AB0, problem is when we connect a voltage input (no splitter used) to both the racks-0 & 1. Rack 0 (primary) reads the correct value but Rack 1 (secondary) reads incorrect value. Even if we change the rack-1 to primary, still it reads incorrect value. Can anyone help on this?

It sounds like you either have the hardware config wrong. If the value is 32768, you could have the resistor module on the side turned to the wrong selection or not installed at all. It should be selection