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IC695CPL410 Profinet IO Redundant not working


I use CPL410 (Firmware 10.15) as primary and secondary PLC. I use Lan 2 in both CPL410 as Profinet and Lan 3 use to be redundancy link. Both of CPL wiring by MRP ring.

Redundant is OK.

Lan View.

Primary Profinet Explorer.

Secondary Profinet Explorer.

Right is Primary and Left is Secondary PLC. Light in IO Secondary not On.

In front panel primary IO status "ALL Device Connected"

In front panel secondary IO status "No Device Connected"

Question : Why light bulb IO secondary not on ?

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