Oscar_83PL

Hello,

I wonder if came accross with the problem I noticed in several projects s7-1200 but with different hmi.

s7-1200 & ktp400 basic:
I display message on hmi about control like ON, OFF, WAITING. But from time to time it flicker or even change the massage despite on PLC tag is set all the time.

s7-1200 & MP 277:
Colour of pump (green -ON, red - alarm, grey - OFF) from time to time stay in the same possition.

Did you have the same problem?

best regards

I think we found the cause of the problem:

When we stopped all the drives (micromasters), we were able to run the profibus network without any problem.

But when we start the drives, the absence of shielding on the power cables caused the interruption of the network.