profibus dp-vi communication interface module ci801
We are facing problem in Profibus DP-VI communication module CI801. Its T(Traffic) LED is flasing sometimes and becoming steady causing tripping of our mill. This is the last interface module. We have changed this CI801 module, another CI801 module just before this module after setting proper address, the DP cable between them with new connectors. Power supply found to be ok (23.8volt DC). What could else we can check. Please help.
K C Dalai
"T" Led indicates 'Receive Transmit Data On Profibus'. This Should be Yellow and should be steady. If it blinks then the problem should be mostly with your Profibus.
1) Better Change new cable between your Previous node and the problematic node
2) Change the Profibus Connectors (Ensure Proper connections are made).
3) Make Sure that your panels are properly earthed. Observe if a particular action/operation triggers the problem.
Still if problem persists, i would suggest you to check your Profibus communication using ProfiTrace tool.
If problem remains unsolved, kindly post Controller logs.
Try to install a profibus repeater it's very cheap and this solve the problem if you have some atenuation on the bus. Long time ago I decide to install repeater module to resolve a old problems with ABB NBPA-12, with firmware version 1.2 and 1.4 and it works perfect.