800XA 5.1 Ac800M redundancy fail
I have one AC800M PM861 in redundant configuration.
when i disconneth both ethernet networks cables in primary CPU I suppose CPU toggle automatically to dual, but it does not work,
it is necesary to fix some settings to have this working fine?
Processor unit redundancy is available for PM861, PM864, PM865, PM866, and PM891. In this case, the controller contains two processor units, each including memory for system and application software. One unit is acting as primary, the other is backup (hot stand-by). The primary processor unit controls the process. The backup stands by, ready to take over in case of a fault in the primary. The changeover is done bumplessly and in less than 10 ms. During the changeover, the process outputs are frozen.
I don't think this is a valid CPU redundancy test.
Please refer to "Verification of Redundant CPU" section from AC800M Controller Hardware documentation.
Are the controllers configured correctly? Before pulling cables, I would check:
- Redundant unit added in CBM
- IP addresses configured in using IP Config tool
- Hardware all present and correct (redundant link cable and BC810, if used)
- Dual light present on both controllers
You didn't present enough data for configuration and connection of your redundant CPU's.
Anyhow, if both CN1 and CN2 on the primary CPU's are disconnected, it have to switch-over to the backup CPU.
Details for configuration of redundant CPU's and automatic switch-over are described in manuals, for example 3BSE036351R5001 or similar.
One of possible reasons for automatic switch-over is:
"Severe communication errors on the Control network, that is, loss of both network ports in the Primary CPU"
I could recommend you to proceed with configuration of both CPU's and CN1/2 as described. You have to do both IPConfig and Config in CBM.
Also, backup CPU have to be "operational" and connected to the control netwrok and IO system (same as primary). The first test should be in Online mode from CBM - try to switch-over from primary to backup CPU and ensure if backup CPU will take control. Then proceed with other tests.
I have tested automation switch-over with PM861 when both CN1/2 are disconnected in primary CPU and it works.
Similar discussion for a redundant system with no network redundancy