Safeguard controller 415 got TASK OVERLOAD WARNING
I have experienced a Plant Shutdown due to Dual Safeguard controller 415 got halted with code 96.
After reset controller and plant, I monitored by CBA Online Builder and found that both 2 controllers (Dual system) got TASK OVERLOAD WARNING at time. I analyzed task load by ANPER command. Then found that at time of high system load, the task "CXKK340 idle" got too high. From 8-10% (in normal state) to 31.5% now.
Can you explain me what task (CXKK340) is? And how to reduce task load?
I attached System Log for reference.
Thanks a lot.
Voted best answer
Bulletins on ABB Library:
Serial communication tasks (CXBH22x) in older AC410 hardware revisions may cause overload due to poor electrical grounding on an internal circuit board. This can be triggered if the processor board is not 100% seated in the frame and the controller is subject to physical stresses (e.g. swinging the frame open out of the cabinet or card insertion/removal)
A workaround can be to connect pin #5 of the serial port to chassis ground.
Contact your regional ABB support center for advise.
Did you study the output of the ANPER load analyze you made?
ANALYSE STARTED AT (DAY/TIME) : 2016-12-14/12:41:09
ANALYSE STOPPED AT (DAY/TIME) : 2016-12-14/12:41:11
CXKK340 idle :************ 24.05 %
CXKK340 = Idle task (called System Idle Process in Microsoft Windows...)
An analysis of only 2 seconds length in time does not tell too much I'm afraid.
The 96 halt is overload, maybe you have tempoary overload that caused this?
Perform more ANPER sessions and try to see if you have something that spikes up from time to time?
Are you using CI547 for MB300 network connection?
The CXND20x tasks (MB300 datalink layer) seem close to 0 so I suppose you have CI547 - but analysis time is only 2 seconds.
CXND201 8 : 0.00 %
CXND200 8 : 0.00 %
If not, a regular CS513 may allow a network storm to overload the CPU.
More information in the Safeguard 400™ Series Version 1.6 Safety Manual 3BNP000432R901 Rev.A.
Ultimately, have a case logged at the ABB SafeGuard ServiceDesk in Oslo, Norway.