Good morning to you all! So I finally figured out my software issues with RSLogix 5000, thanks to you all!
Now I have a hardware issue. Here is what's going on. I powered up my CompactLogix L45 PLC array, and was able to connect to it, upload the stored program to my laptop, edit the program, and download it back to the PLC, no issues.
However, it seems the processor is not passing power from the 1768 backplane to the 1769 backplane. I have solid red "PWR" and "IO PWR" LEDs on the PLC. I removed all 1769 modules and same thing. Just to be thorough I removed the endcap to see if I got any different LEDs to light up, and just the same PWR and IO PWR LEDs lit up red. I did not check the pins on the PLC with a meter yet, but I did throw on just a Prosoft PS69 Profibus module, and no LEDs on it lit up when I turned everything on. The PWR LED should have lit up at the very least if it was getting power.
I tried flashing the firmware. Same thing.
I performed a PLC reset. Same thing.
I figure one of three things is going on:
1. The endcap is bad.
2. While the power supply passes its own self check, has a green light, and powers up the 1768 modules with no problems, it is not supplying adequate power for the PLC to pass a "power check", and pass power through to the 1769 backplane.
3. Hardware failure inside the PLC.
I have another PLC operating in the same family as the L45 (an L43), so I can try tossing it into that control cabinet and seeing if the modules will get power. But that will have to wait until tomorrow morning as I will not be at that location until then.
What I am wondering is, have any of you folks ever had similar issues with a CompactLogix system? Can it be an electronic keying issue? I would think the modules would still receive power if that were the case, just not communicate. Are there any troubleshooting steps that I am missing? I spent a few hours poring over forums and the almighty internet, but I did not find much. What I did find is that it is most likely a hardware issue.
Any experience anyone can share is greatly appreciated, thanks for reading!