I have run into a SLC5/05 processor which is faulted, and when I go to connect to the processor, I get an error message in RSLogix500 saying cannot connect processor corrupt. How do I recover from this? This processor is a brand new L552 (installed 4 weeks ago and commissioning is still going on). Any advice would be appreciated.

 

Refer to Appendix B in Publication 1747-10.4 - July 1998, to reset processor to factory defaults.

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Use this procedure if the communication channels are shut down because they were configured to be shut down, or if you absolutely cannot establish communications with the processor.

ATTENTION: If you return the processor to the initial factory conditions, the user program and communication configurations are returned to their default settings.

1. Remove power from the SLC 500 power supply.
2. Remove the processor from the chassis.
3. Disconnect the battery by removing the battery connector from its socket.
4. Locate the VBB and GND connections on the right side of the motherboard.
5. Place a small bladed screwdriver across the VBB and GND connections and hold for 60 seconds. This returns the processor to the initial factory
conditions.

Copyright 1998 Rockwell International Corporation
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Depending on the model and cause of the fault, sometimes taking the processor out of the rack and discinnecting the battery for several minutes can help. I also think there are some models that have a set of small terminals on the board that if shorted, will reset the processor to factory new conditions. Check the manual to see if either method is referenced there.

Regards,
Russ Kinner
SSOE, Inc.
Phoenix, AZ USA

 

Take the battery out, and short a couple of pins on the processor card. I can't remember exactly which ones, but it's on the A-B website somewhere. Or the distributor should be able to tell you which ones off the top of their heads. That resets the RAM to blank state.

It won't help you debug the program, but it will fix the hardware.

MB
--
Michael Batchelor
www.IndustrialInformatics.com