Can anybody tell me why S900 node power starts Fluctuate when profibus Communication cable connect to red CI920s
Actually we are Communicating 10 nodes from PM864.In that node-1,3&4 power supply are fluctuating. i observed, it is happening only when i connect profibus communication cable at red CI920s and it will stop if i remove any one i/o modules or ci920s or sa920s
and i checked voltage 19.0v and current 4.0mA at sa920s both are matching with data sheet . As per i/o bytes in node we have not exceeded recommended bytes. can any one explain me why this is happening and where am i wrong ????
This happens if the primary power supply doesn't supply enough power,we have in the manual the specifications limits, please check these for the s-series manual.
pls see the power supply chapter.