Backup CPU Ethernet Channel failure in redundant configuration of PM861
We have PM861 in redundant configuration.
when we download the program in CPU then both the LED(Tx & Rx) of CN1 of Primary blinks but in backup cpu only Rx LED blinks.(Here network redundancy is not used, Only CN1 Port is used)
If we disconnect the ethernet cable from primary cpu then communication fails. But if we switchover the CPU then same problem ocures with backup cpu only.
Every time the ethernet warning comes in harware configuration.("No communication BackupCPU." as screen shot)
This works fine with a different CPU units.
I have checked all ethernet configurations but unable to sortout the problem.
Voted best answer
I would suggst you to go through the documents below.
3BSE036351-510_-_en_AC_800M_5.1_Controller_Hardware.pdf Installing the PM86x/TP830 Processor Unit in Redundant Configuration Section 2 Installation to check controllers and cable connection.
3BSE036351-510_-_en_AC_800M_5.1_Controller_Hardware.pdf page 183 -184 to check module status LED.
3BSE035982-510_en_AC_800M_5.1_Communication_Protocols.pdf page 41 -42 to check IP setting and network cable to switch connection
I had the same problem.
One project is still working with that error since 2007. My bad. But there is no problem except the error in control builder. Controller redundancy works properly.
The answer is simple. You don't use network redundancy but you should launch and properly configure RNRP service. After that error in my project dissapeared.