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sandeepkharbanda
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Join Date: Feb 2010
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Program Lost After Operation in PLC 5/20 (Allen Bradley)

03/03/2010 1:41 AM

i have the PLc 5/20 allen bradly for automatic operation of DG set when grid fails.From last few days i have been facing the problem that the program of the PLC lost after the one time operation as grid fails.

do u know why the program is getting lost.
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JohnDG
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#1

Re: program lost after operation in PLC 5/20(allan bradley

03/03/2010 4:33 AM

Does it have a memory which relies on a battery? If so, is the battery OK?

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sandeepkharbanda
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#2
In reply to #1

Re: program lost after operation in PLC 5/20(allan bradley

03/03/2010 6:00 AM

how to check the battery in running condition
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JohnDG
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#3
In reply to #2

Re: program lost after operation in PLC 5/20(allan bradley

03/03/2010 6:52 AM

Look at the front panel:

The expected battery life is from this table:

More details click here.

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sandeepkharbanda
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#6
In reply to #1

Re: program lost after operation in PLC 5/20(allan bradley

03/06/2010 5:35 AM

Battery was found ok.

i have reloaded the program again but still not find the root cause for lose of program
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JohnDG
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#7
In reply to #6

Re: program lost after operation in PLC 5/20(allan bradley

03/06/2010 5:48 AM

Does the processor have an EEPROM module?

If it does, do you have the switches set to load processor memory from EEPROM on power up?

If it does not have one, I suggest you get one.

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sandeepkharbanda
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#8
In reply to #7

Re: program lost after operation in PLC 5/20(allan bradley

03/06/2010 6:26 AM

we dont have the EEPROM module.but these are all the solutions,i need to find out why this has been haapen
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JohnDG
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#9
In reply to #8

Re: program lost after operation in PLC 5/20(allan bradley

03/06/2010 6:55 AM

I think you'd need to monitor the power input to the PLC system when the grid failure occurs.

My first step would be to use a mains analysis instrument something like this (click here), with an input range suited to the power supply input voltage. You may be able to hire one locally. Could be you just need a bit of power line conditioning to make sure the input fails gracefully.

Please note as a general point in dealing with failures: is it better to spend a day preventing the failure from disrupting operation (leaving the underlying cause unknown), or to spend two, three or more weeks trying to track down the cause, then possibly finding that remedial action is out of your control & having to resort to the "quick fix" anyway? I suppose it depends how much time you have on your hands.

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Delmar
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#4

Re: Program Lost After Operation in PLC 5/20 (Allen Bradley)

03/03/2010 11:12 PM

You can upgrade to the newer CompactLogix or ControlLogix family of Allen-Bradley controllers where you can save the program on the CompactFlash memory card. The program won't get wiped upon a power failure with battery failure.

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sandeepkharbanda
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#5
In reply to #4

Re: Program Lost After Operation in PLC 5/20 (Allen Bradley)

03/04/2010 12:24 AM

customer is not ready to upgrade the plc because of cost factor
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pareshh_joshi
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#10

Re: Program Lost After Operation in PLC 5/20 (Allen Bradley)

03/22/2010 10:38 PM

alllen bradly plc 5/40E plc programming sofware RXLogix 5

its hardware i/o rack one going to faulty mode

many time once rack supply made OFF and made ON then it will be coming normal

any one guide that how this fault occurs and solution.
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