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FAQs

I have just assembled a Series 90-70 system and the CPU’s OK LED is off. I have replaced the CPU and the problem persists. What could be wrong?
What software is available to program and troubleshoot Series 90-70 PLCs?
Can I use the external 24VDC output on the Series 90-30 power supply to power external devices?
Can I program my Series 90-30 IC693 CPU364, CPU372 and CPU374 through the serial port on the CPU module?
My PC will not communicate to the programming port on my Series 90 CPU. What are the possible causes of this problem?
When I try to download the configuration to my Series 90 CPU, the download fails because passwords are disabled. How do I fix this?
What software is available to program and troubleshoot Series 90-30 PLCs?
My Series 90 CPU stopped. How do I identify the cause?
The I/O ENABLED LED on my Genius block is off or blinking erratically. What does it mean and how do I correct the condition?
The UNIT OK LED on my Genius block is blinking. What does it mean and how do I correct the condition?
I am upgrading my old series 6 PLC; do you want to buy the old stuff?
How can I view, print, or change the ladder logic in my GE Fanuc Series Six PLC?
My Program Development Terminal (PDT) has stopped working. What do I do?
The letter at the end of the part number on my spare Series Six module is different than that on the board in my system. Can I still use it?
Should I upgrade my Series Six PLC system to a newer product?
My battery died and I lost my program, what do I do now?
My GE Fanus Series Six PLC FAQ Support
What does error code E21 on a Series three PLC mean?
How do I know what particular Series Three PLC Error code means?
What does error code E41 on a Series Three PLC mean?
What does error code E22 on a Series Three PLC mean?
How can I create a backup copy of the program in my Series Three PLC?
Is there software I can run on a personal computer to communicate with a Series Three PLC?
How can I view, print, or change the ladder-logic program in my Series Three PLC?
My Series Three PLC quit working; how do I troubleshoot the problem myself?
Should I upgrade my Series One PLC system to a newer product?
How Can I tell if the power supply in my Series One PLC rack is working properly?
How do I know what a particular Series One PLC error code means?
What does error code E21 on a Series One PLC mean?
What does the “Battery” light on a Series One PLC indicate?
How can I create a backup copy of the program in my Series One PLC?
How can I view, print, or change the ladder-logic program in my Series One PLC?
My Series One PLC quit working; how do I troubleshoot the problem myself?