My GE Fanus Series Six PLC FAQ Support
November 27th, 2018
The Series Six PLC should have all lights on the CPU cards (I/O Control, Arithmetic Control, Logic Control, and Logic Memory) for normal operation. Often one or more of the lights will be off when a PLC shuts down. You will want to make a note of the status of the CPU lights.
When it is safe, turn the key switch on the front of the Power Supply from Run to Stop. Turn the power switch to the off position, wait for 1 – 2 minutes and turn the power back on. After you turn the power on, turn the key switch to Run. If all the lights are on and the process starts, then you had a soft fault. You should be fine and continue running.
However, if the lights go back out after cycling power, then you have a hard fault. This is caused by a hardware failure or loss of the program. To know what boards to change first, you will want to refer to the manual GEK-25361, Installation and Maintenance manuals, and look at the chapter Troubleshooting and Repair. This section will have a flowchart to follow showing what cards are suspect based on which lights are off. You may also contact us directly at 1-800-784-9385 or through email to email@example.com.