[mikeNJ]

Attachment 197190
I have this machine that is run by a PLC controller. It's quite old but hasn't had any problems until recently. There was a power outage and now the PLC won't go into run mode. The lights for all the boards at lit, but the run light won't go on. I have tried reseating all the boards, and switching to stop then back to run mode. Does anyone have any experience with these controllers? Is there anything I can do to get it back into run mode? The screen runs through it's diagnostic and then just stays blank.

[nautomation]

The PLC went in STOP Mode , Check the PLC Data , Reset the PLC ,

[mikeNJ]

Could you be more specific on how to check the PLC Data and how to reset the PLC? I'm very new to this type of machine.

[nautomation]

RUN Light on Or Off ? If off than CPU is in stop mode. and what about the CHECK Lit it is on or OFF ? If the Run Light is off The major cause is = CPU self-test has not passed within 300 ms *50 ms, or user program takes longer than 300 ms to execute. CPU goes to STOP mode and I/O chain is reset.On The I/O Board there is a hardware Button of Reset you can reset the I/O from there. If at any time when the CPU is switched to the RUN mode, it drops out of RUN on a memory parity error, most likely the communication ports are locked out. To reset the ports, turn the RUN/STOP keyswitch to STOP, power-down the CPU and power-up again.

[nautomation]

Corrective Action
l Check the position of the RUN/STOP key switch, See step (1).
l Check the condition of other status lights (PARITY, BATTERY, CHAIN OK, CHECK
and POWER).
l If no other problem is indicated, try restarting the CPU with the Workmaster
computer or CPU key switch.
0 Ensure that the short length of ribbon cable connecting the Arithmetic Control and
Logic Control modules is securely connected. L
l Reset the Arithmetic Control and/or the Logic Control modules.
l If reseating does not solve the problem, replace the two modules, one at a time

[mikeNJ]

the run light is off. here is a pic of the plc itself.

[mikeNJ]

I don't know where the reset button is on the I/O board. There is an Aux I/O board and an I/O con board