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Good afternoon!
I hope all of you be ok.
I have a very strange situation in a customer plant, and I would like if someone could help me.
Customer has a S7-300 PLC connected by ProfiBus to an et200M which has 3 DI modules and 3 DO modules put in this way:
PS -- ET200M – DI (1) – DI(2) – DI(3) – DO(4) – DO(5) – DO(6)
Problem:
The input signals of DI (2) arrive to the PLC with a delay of 20 seconds, but in the other modules the signals arrive to the PLC in a properly time. I checked this by STEP7 – VAR TAB
I performed the following tests:
Electrical installation: OK
Environmental conditions: OK
Machine vibrations: NO OK (I detected moderate vibration)
Solution:
Firstly, I changed the DI (2) module by a new one, but the delay persists.
Secondly, I returned the old module to DI (2) position and changed DI (1) by the new one and PUFF! The delay in the DI (2) disappeared.
Did someone have a similar situation? Can someone try to explain this issue?
Sorry for my English!
Thanks in advance!
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