Dear all;

Does anyone know why this event can occur in the CPU 400:

Event ID 16# 452B

CPU REBOOT to eliminate data inconsistency

Not relevant for user: 84fc   0001  ac01

Previous operating mode: STOP (internal)

Requested operating mode: Error-search mode

Event occurred in the standby CPU in rack 1

Internal error, Incoming event

06:31:14.934 PM  04/19/2023

(Coding: 16# 452B  F14E  5050  84FC  0001  AC01)

Automatically goes to stop mode and tries to restart, I can't find this event code in support. 

Thanks in advance !!

Hi Elon;

First of all thanks for your answer, I've attached the diagnose. We have redundant system. On 19thof April at 06:31 the CPU went to stop mode and tried restart to remove data inconsistency, We had a problem with communication wire in the other CPU, intermittently loosing communication some days before, I don't know if this is the root cause.

MHARITZ

Hi Elon;

First of all thanks for your answer, I've attached the diagnose. We have redundant system. On 19thof April at 06:31 the CPU went to stop mode and tried restart to remove data inconsistency, We had a problem with communication wire in the other CPU, intermittently loosing communication some days before, I don't know if this is the root cause.

Hello,

Replace the Sync Module or FO cable connected to IFM1F (The upper one).
After replacement, the CPU enters linkup mode to sync between the two redundant controllers.

Thanks for your answer.

We have a redundant CPU as you can see in the next picture:

We detect this mistake because we loss some data when the backup CPU had to work, we had two problems:

1. The network wire "yellow" was functioning improperly.

2. The backup CPU was in stop mode "we don't know why" attached diagnose.

Both CPU 1 and 2 are connected to PCS7 SCADA system, as you can see in the diagnose the CPU stopped on 19 th April, but we've data looses between SCADA and CPU's before these days.

How is it possible if we have redundant and backup CPU was supposed to be on ¿?

In the diagnose we've seen another issue on 3 th  march:

If you have any idea feel free to share.

Regards