dear all 

i have issue with s7-1513R article No.6ES7 513-1RL00-0AB0 with I/O station IM 155-5 PN HF articleNo.( 6ES7 155-5AA00-0AC0 ) and switch SCALANCE XC208 rack the main issue was when i start synchronized two cpu the main pairing are successful , the second ring loop was not working so the configration in TIA Portal as following : -

- media redundancy of role are manager (auto) for CPU s7-1513R 

- media redundancy of role are client for I/O station IM 155-5 PN HF

- redundancy of role are client for switch SCALANCE XC208 , 

-consider the topology connection in TIA protral and physical hardware connection 

- the connection between cpu and i/o and switch are multi-assigned 

-enable System IP addresses for communications processors

- all framware for all device are new and updateded 

when download it and start syncronized it work at first but after switch off the CPU for small maintenance in power of relays the switch it on the redundent not working   all the configration terms for redundancy are correct as i know 

so please would any one have been through in this issue before , 

what do you think is there interruption or damage in hardware ports in the cpu