slc 500 fault

dears , i have a slc 500 4/20b processor

the processor obtained a fixed red fault
after few times of power down and up the fixed red fault becomes blinking
and i cannot make a communications
processor completely halt
i trying to replace battery ..
replace rack
replace power supply
cable communications

but no one work

anyone help please

Try this procedure to reset the processor :

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.

http://www.plctalk.net/qanda/showthread.php?t=55945

The above thread may help you out.
Regards,

What is the exact model of the processor?

Do you have the programming software
and interface cables?
Do you have a backup of the plc program?



james

thanks

i thnk that the only way to solve the problem is replacing the module