Problem with AI1 in RTD

I have a 0BA6 logo with 3 modules: one DM16 and 2 RTD. I have 4 PT100 installed with 3 wires. The problem is that I'm able to read right the AI2, AI3 and AI4, but the AI1 get a wrong value, more or less 10 degrees more than the real temperature.

When I delete the program and put a new one (almost blank) and I check the value of AI1 in the display, I get the same error. That is the reason because I think that the problem is not in the program.

I have tried to change the order of the RTD modules and I allways have the problem in the first (AI1).

I have tried with other PT100 too.

Thanks for helping!

One amplifier was configured as "no sensor"