GE Micro PLC

[PLC_Who]

A machine started with a working program. No logic changes have been made. After a storm that caused an electrical surge we lost control of some of the PLC outputs. To explain the problem more in depth a coil can be placed in a rung where the logic solves it as always ON and the output still does not actually turn ON. My first thought is the relay output on the PLC was bad however on further investigation we discovered that the software lets you force the output On / Off without a problem and the relay output responded appropriately. When the PLC is placed in run mode and the PLC solves the logic, outputs 6 and 7 will not respond appropriately. I know what you are thinking but I assure you it is not a programming problem. I know this because when moving the identical logic to a different brand PLC it to works properly and prior to the electrical surge the GE Micro PLC also solved the logic properly. The logic below should cause the output to come on unless there is conflicting data tables or possibly duplicate coils. I have verified that the data tables and coils are not the case. -------------------------------------(output6)-- I can watch the N/O input below pass power and there is no response to the output. --[input]----------------------------(output6)-- During the diagnosis I have determined the problem moves from one PLC to another. Our current thoughts are that an electrical surge may have somehow corrupted the program. I am trying to determine if there is a status bit that needs reset or if there is a way to remedy the program in the GE Micro without replacing the controller. The software that we are using is vintage "GE Fanuc Micro242" which is a DOS based program running on Windows 95. When a new separate program is created output 6 responds in the GE Controller responds as expected. When we enter the program back into the controller line-for-line we eventually end up with outputs 6 and 7 no longer responding which then points back to the program. Literally there is 4 pages of logic and I am quite frustrated that the only way we were able to solve our customers problem was to replace the controller with a new different model processor. When we chose a new different model controller and entered in the logic onto the controller the logic solves as expected. So here is the question: Has anyone ever experienced this same problem on an older GE Fanuc Micro PLC and did you ever arrive at a solution to solving GE Fanuc Micro Programmable Controller problem. I have the PLC sitting on my desk and now it is a matter of curiosity not necessity. Any help would be appreciated.

[RussB]

I have never seen nor heard of this before, with any PLC. But I did not like this model and never recommended or sold it unless the customer insisted. I would be interested in seeing the logic, but I do not have one of these to try it in. This PLC had one-shot contacts that some times acted strange. Do you have the latest software patch?

[Steve Bailey]

I still have one of those old units and I think my laptop with the Miscro242 software still works. If you want to send me a copy of the program file, I can download it to my unit to see if I experience the same behavior. Send me a private message through this site if you're interested and I'll give you my email address. Like Russ, I never liked this unit. The same product was also marketed by (I think) Square D with a gray plastic case instead of black.