Omron PLC Center

If you have a SLC 500 processor: Category # L551-1747, SER: C proc Rev: 5
OS: 1747-OS501, SER C, FRN 9th
when switching, LED status: FLT all days of solid red, RUN forever. Other (BATT, strength, ENET, RS232) stops blinking or off.

try, you can communicate with the processor 232 can not connect.

I appreciate all your input. If you need more information, ask here.

Try removing the battery, and either for about 1-2 minutes, or use a jumper, where he was waiting in the short remaining battery voltage involved.

If any of REpower CPU and the LED patterns are still there, and you can not connect, then the CPU is probably pooched

Understanding in this case
Processors were back to our office on a separate bench to put the same theoretical examination. While they are at various booths on plants that were installed in delayed, but we feel through rack / power supply from different backgrounds was a good idea. Our test has the same rack as the shelves in this area.

Yes, these devices have been installed and is running every day for about four years. The batteries were the false ads, so we went to replace them.

Yes, we were looking at remanufactured processors. I had to explain how it causes confusion.

I am aware of the difference in performance, but a system that does not use these processors to run the speed of communication and can be sacrificed.

I am also aware that not have the Series A and B being new, but we buy used one at a much lower price than to fix what Rockwell fees a bad processor.

I had the same assumption you did yesterday, that these processors have been toast. With this well known and followed again by a short circuit pins allow the investigation again and again and I was able to get one working again. This processor is running and continue running as we speak, regardless of the power cycle. Yesterday, after I managed to run and be able to communicate cycle will have a 50/50 chance of permanent debt or run the test program. This is not the case, I did not get to ring in the position error, after running all night. I have tried to duplicate the problem and I am able to do this, after 24 hours of testing. I leave it on my desk next week peridically bike before I make decisions, how to replace it or not.

Yesterday, when I talk to you in a position to the processor and run a few hours and then come back from a serious error and cycled the power, I began to think that what the problem, these processors share was by replacing the battery will cause. I think that what happened before replacing the battery and it’s brought him. This reminds me of the computer running that OS routine is interrupted. Sometimes it comes, sometimes it used to, but, once launched, will remain in operation.

The second controller is a different story. I found a bit more this morning. I could with the programmer who originally spoke the battery replaced. While he was on the phone with Rockwell, one of the agents asked him about the firmware jumper on “Program” to see whether the light moving pattern changes. For this reason, I believe that the processor is still loading the firmware. This would confirm why shorting pin has no effect. Can not restore the default settings for software that does not exist. Either way, the firmware upgrade kit on the way, so who knows, maybe it will work.

I find it funny after all these years of work with electronics, two units, while deteriorate exactly the same way. It wouldnt if it was a common problem, but I am surprised Rockwell States are not aware of any documented cases that correspond to the subject. That’s why I posted here. I wanted to see if others have this problem, and that Rockwell is denied. It wouldnt be the first time.

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