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Lost password & backup programming 1

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we're lost the password and haven't backup program slc-500.
how to reset password and program not lost?

thank you very much
 
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I think there is a way to recover the program from the processor, however you will need to contact Allen-Bradley for the process.
 
it is expensive. any idea?
 
If the PLC is networked you may want to try sending a message to the status file from another PLC on the network and disable the pass word protection.
 
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