Ci840 does not communicate
I have some CI840 modules, that not communicate, I try with scan bus, but the module does not appears in the list.
Leds in module, failure is off, R is off, P is green, Rx/Tx is flashing orange, prim is orange, and DUAL is Off,
Using service port, it is possible to verify firmware, it was in 3.2/0 and now I update to 4 version.
but the module can not communicate.
What is wrong, what can i do?
Voted best answer
Well, there are a few things to check.
Do you have other slaves in the same profibus line?
Are they communicating? If yes, are they places before or after this CI840 modules? What is the termination status?
Have you checked the profibus connectors on CI840? If the connectors are not made properly , cables inside can get twisted and short out and there will be no communication. please check all this and let me know.
Thanks for your answers,
I already checked wires, connectors, and everything is ok,
Looking in ABB web page I found one document that explain that some CI840 modules failed, with a low voltage in bus, and suggest to check level voltage, i will check this, and I will comment that happens