Sometime Analog module showing overflow value 7FFF

[rayen_6827]

If i have one analog module (331-7kf02-0ab0):Connected four (2-wire) inputs AND Connected Two (4-wire) inputs to this module .This is the right thing or not؟
the devices are Pressure transmitter and temperature and flow.Some have two wires and some have four wires.
for example:CH0 ,CH1\CH2,CH3 is 2DMU
AND CH4,CH5\CH6,CH7 is 4DMU.

but now my problem: Sometime in HMI ALL DEVICE displays the amount of overflow(7FFF)

,And when we disconnect one of the THEY from the terminal of the input module, their values are displayed

The AI module is not fault as i checked it on othe CPU ,project it is working fine.

[CoMod]

Some info about Hardware Switch position and read adress in Step7 v5.5 and TIA Portal
6ES7331-7KF02-0AB0 SM331 AI8
http://s7detali.narod.ru/ET200M/SM331_AI8.html