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#1 |
Member
![]() ![]() Join Date: Aug 2019
Location: Ohio
Posts: 2
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PLC 5/40E losing program
Have a PLC5/40E that has a battery installed and a working battery warning light that is off with the battery plugged in. There is no memory module installed.
Following a several second power outage the PLC lost its program, I am told by the building maintenance manager this is not the first time that this has happened. I attached a fault log if anyone knows how to decipher it. Thanks |
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#2 |
Lifetime Supporting Member
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Power surges can cause this. I have installed UPS's to help cure this problem.
Check grounding and surge protection for all inductive loads.
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Mickey If you want happiness for an hour-take a nap. If you want happiness for a day-go fishing. If you want happiness for a month-getmarried. If you want happiness for a year-inherit a fortune. If you want happiness for a lifetime-help someone else. ----- Chinese Proverb |
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#3 |
Lifetime Supporting Member
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Power surges, brown outs etc.... have wiped programs in the PLC5 and SLC platform at many of my sites. UPS is best solution, even a small one will help you ride out the "bumps".
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#4 |
Lifetime Supporting Member + Moderator
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Or install a memory card, and monitor the "memory was loaded" bit (dont remember which one). When the memory was reloaded, trigger an HMI alarm to notify the operator that he may have to check and reenter settings that may have been reset to default values.
But I guess a memory card for a PLC5-40E may be more expensive than a UPS.
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Jesper ![]() See my profile interests for Q&A
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#5 |
Lifetime Supporting Member + Moderator
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Same here, worked great !
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#6 |
Lifetime Supporting Member
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Location: Detroit
Posts: 244
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Hi, and welcome to the forum. We had a lot of those PLC 5's out west where I worked, and like JesperMP said, we had EEPROMs in all of them. There were configuration options to "load from EEPROM" when recovering from a power cycle, plus the processors had a good battery. Maybe those EEPROMs are available on Ebay or somewhere. Hope this helps.
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#7 |
Lifetime Supporting Member + Moderator
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Here are a couple... and its from a great seller
![]() https://www.ebay.com/itm/371894342265 https://www.ebay.com/itm/282398316348
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www.PLCCable.com PLC Communication Cables, PLC Trainers, Fluke Meters, MicroLogix, ControlLogix, Siemens, Allen Bradley and more... all your automation needs... ((NEW)) After Market 1784-U2DHP Allen Bradley USB to DH+ and Gateways |
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#8 |
Lifetime Supporting Member + Moderator
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In case you go for the EEPROM:
To select "EEPROM memory transfers to processor memory if processor memory not valid." you have to set both switches 6 and 7 in the chassis backplane to ON. Then in the PLC code you monitor S:10/3 "EPROM memory transfer at power-up". Use this to trigger the HMI alarm.
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#9 |
Member
![]() ![]() Join Date: Aug 2019
Location: Ohio
Posts: 2
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There are roughly 40-45 PLC 5's in the facility. The unit that is losing its program is housed in a control panel with another PLC 5. I will double check though that the grounding is good.
I doubt they will go for memory module, but they may be willing to try a UPS. |
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