I am setting up a system where the server has two ethernet cards and a PLC it is talking to is a redundant pair and each PLC has two ethernet cards as well.
I've configured the Modbus driver as per image attached
Question 1:
For this I have disabled the redundant PLC in the Modbus driver configuration (it's currently not available to me). This seem to work. For example If I pull the cable out of PLC1 Ethernet1 card, I can see pmon messages that the system lost connection to 163.189.12.56 and established connection to 163.189.13.56. Graphics continue to work.
What I need to do now is to be able to report on the status of all these network connections. I looked in the internal datapoint "_Mod_Plc_1", there is ConnStatus and Error tags (see attached image)
but they seem pretty general and I really want to know the status of all 4 connections (active, standby, broken). Is there a way do achieve this?
Question 2:
If I re-enable the redundant PLC in the Modbus driver configuration I get the following bevaviour:
1. Pmon keeps messaging that both connections to the redundant PLC failed (that part is probably OK)
2. If I look at the DP in the PARA I can see that the invalid bits of the DP come on and off all the time (which incidentally makes all my graphic objects flash invalid all the time). This is actually not good, the whole idea is that the system should operate even if one of the redundant PLC is dead. Am I doing something wrong?
