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#1 | |
Member
![]() ![]() Join Date: Feb 2014
Location: Stirling
Posts: 648
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1756-L55 Clearing Memory
Some information for the folks on here.
We had a 1756-L55 clear its memory whilst running. The guys managed to power it down and reload an old backup to get it going. The PLC was checked out by Rockwell - here is their response : Quote:
One to watch with the older processors I think.... |
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#2 |
Lifetime Supporting Member
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Well, that response said nothing that I can comprehend. Basically I took that as "**** happens".
We had a similar fault on a electronic trip relay (basically a controller) last year. It came back from the manufacturer as a "one-time abnormality" I guess the good thing in all that the controller took itself out of commission before any bad stuff happens. |
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#3 |
Lifetime Supporting Member + Moderator
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That's a very typical response you will get from RA.
Something went wrong.... The diagnostics did not tell us what.... The diagnostics did not tell us why, or where.... But the controller is working normally... That's what it does when it detects an error we can't tell you about, because we don't know, but rest assured, it is perfectly healthy !!
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#4 |
Member
![]() ![]() Join Date: Feb 2014
Location: Stirling
Posts: 648
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Aye, well....we could not take the chance.....the fault happened at a weekend.
We ran with the dodgy processor for less than a week, took the chance at the next shut and replaced the processor... |
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#5 |
Lifetime Supporting Member
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Maybe a high energy cosmic ray just happened to zap a particular bit in memory.
I've had that happen though as well, but I don't bother wasting time with Rockwell on it. Typically, I've always seen it with a power off, or sag, with the battery backup not holding. Especially on L55's, the backup there was measured in minutes if lucky, unless the external BATM module was used.
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#6 |
Member
![]() ![]() Join Date: Aug 2010
Location: England
Posts: 21
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I've also had this in the past with a L55 on one machine on multiple occasions. It could run months without issue. Firmware & battery change made no difference. Replaced the processor in the end and the issue went away.
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#7 |
Member
![]() ![]() Join Date: Apr 2008
Location: ND
Posts: 33
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We had two machines with L55s that would randomly do the same. New processors, replaced batteries, firmware updates, etc...always the same thing.
We finally upgraded the processors to L61s for firmware support reasons (when we upgraded our PCs to Win7 64-bit) and we haven't had the problem since. |
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