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AC500 Redundancy Problem

Hello Evryone,

In My System i am using PM590 in redundant configuration.

during shutdown activity I faced following problem 2-3 days ago. can anybudy guid me how to reslve this?

Plant is running OK in. after some modification in logic i download first in CPU A. and it will run OK. now after downloading in CPU B after 3-4 second it will go offline and show Communication Error in Codesys. after that i cant make it online from PC.

than i press Stop Buton from CPU and try to make it Online and it will sucssess. than what i observed from task manager all task i set it shows Error. and i cant make it in Run mode from Codesys as well as from key board. after cold reset plc from codesys again i download program in CPU B. same problem repeat 2-3 times.

after this, I completly reset PLC. set IP address. and agin download program. But same problem again.

Than for testing i removed eth. link from CPU A to CPU B. than i reset plc and make it run. it will run fine.

but when i connect link between both PLC. again same problem happen.

then i power off both CPU and power on again than i resolve problem.

So what is reason because of this i faced above problem. can anybody help me??