Thanks for the replies.
akreel,
Allen-Bradley's literature doesn't mention anything about the startup tests for the SRM module. There is no manual for the SRM module. Only installation instructions. The installation instructions booklet does give information about the error codes but nothing about the startup self test codes.
Regarding your questions,
1) The fiber cable is connected to the two SRM modules
2) The cards in the various slots are as follows:
Slot 1: 1756-CNBR Ver. 5.36
Slot 2: 1756-CNBR Ver. 5.36
Slot 3: 1756-L55M13 Ver. 11.6
Slot 4,5: Empty
Slot 6,7: 1757-SRM Ver. 3.25
3) I have installed the same version of firmware in each SRM, processor and CNBR
4) Software version 11.11
The system was working fine after commissioning. One fine day the maintenance guy calls up and tells me that the redundancy is not OK.
On first observation, the LED display on the SRM was blank and the OK LED was solid red.
So I cycled power to the secondary chassis. This is when the SRM module didn't go past startup self test TH73 and I also get the following message on the CNBRs:
ASSERT: wait4sbm.c line 0114