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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?
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?
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?
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?
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