PM902F Controller Frequently Switchover and Profibus Slaves shows slave not ready
I have Freelance 2013 SP1 and PM902F Redundant Controller. Till now I made below mentioned observations:
1.) If I Start Both Controller Individually as a Stand Alone Controller then All Profibus Slaves remain Healthy, Profibus Line Redundancy Also Healthy, Controller also Healthy.
2,) If I Start Both Controller to Establish Redundancy without Profibus Line Redundancy only Line-A then All Profibus Slaves remain Healthy, Profibus Line - A Also Healthy, Controller Also Synchronised and Redundancy Ok.
3,) If I Start Both Controller to Establish Redundancy with Profibus Line Redundancy Line-A&B then All Profibus Slaves shows frequently Slave not Ready message and when i observed physically Redundant CI840 module then I found that During Slave not Ready Messages CI840 remains in Dual mode only there is no switchover but frequently Rx/Tx LED goes off and after some time Controller also Start SwitchOver Frequently.
4,) Due to above mentioned point 2 and 3 I thought Line-B Cable might be a Problem so I swap Line-A and Line-B Cable. But In that case also observations remain same as Point 1,2,3.
5,) Then Finally I replaced Both Redundant CI930F modules but Situations remains same as point 1,2,3.
6,) I thought might be I have made some config mistakes in Project. So I create new Test Project with all default values and download into controller but situations remains same as points 1,2,3.
I already updated Controller and CI930F Firmwares. Right now I am not able to decide that it's a problem from Hardware side or Software Configurations Side. Please help me to come out from this Situations. Thanks in Advance..
Check following thread with similar issue @
I suspect on termination and redundant profibus line cabling.