ertw

Yep. I totally agree. It's bull. You buy the machine. It should come w a copy of the software.  I have bought numerous boards off eBay over the last year. The a2ncpu computer board was one of a stack I sent out to a company who specializes in melsec plc repairs. They said they replaced a few things inside it. I would have to pull the email and let you know what they did.  Ill try to find it later this evening.  The thing is.  My other 10 machines, I can call tech with an issue, and they can narrow it down to a board very quickly. Niigata seems to have no clue. Just throw parts at it. 

I've been trying to get the program from the manufacturer. But they just don't understand seemingly anything. Or they don't want to provide what I want.  Instead, they charged me $4000 for the eproms.  They were going to send a tech out, whose never seen this machine before. And had no idea how to fix it. Unfortunately, the machine is fairly complex. Conversion to a newer plc would likely be more expensive than it is worth.  Im going to contact them again Monday. And tell them that the eproms didn't help.  It is strange though, that the error code changed...

Oh, maybe it helps to toss the new file on here.. Updated Niigata program.zip

Hi All!   Been a while since I reached out on this topic.  I was able to purchase new EPROM chips from the supplier in Japan. I've installed them and run the process of resetting the PLC per their instructions. Of course, I have similar problems, the machine will not run, and the Error light remains on the A2NCPU board.  I plugged back in, and read the program from the PLC - and it looks better than the old corrupt version. However, the PLC diagnostics pulls up a new error code ' Missing End INS. '  See the pictures attached.  Not sure what to do next. My plan is to get it running, then convert to different PLC system. When loading the program, it comes up with the first 2 images. Then I can see the End is added, but white not yellow.. I also show the PLC Diagnostics page. Beginning to think I should just scrap the equipment alltogether.  Thanks.

The equipment is 1994, but has many more years of mechanical life on it.  Im assuming the program was written via pc, but who knows.  Ill probably hear back from the manufacturer after the holidays!  Wish me luck.  Thanks for the explanation  Jason

Gambit, Ron, thanks for the reply --- that is kind of what I figured.  Poking around led me to a similar assumption.  What is GGP? I'll be reaching out to Niigata to see if they will provide the original PLC program.   If not, this thing is 12k lb of scrap! Will let you know what i find.

Hello all, new to the forum here, but have been digging through the great detail.  Looking forward to learning from this community. Hopefully someone here can assist with an issue i'm having with a piece of equipment running a Mitsubishi Melsac A series PLC (A62P, A2NCPU, AD57S1, AX42, AY51, AY6DS, NE21, AD76S) Let me start with a little background. This equipment is a Niigata brand injection molding machine. It is fairly basic in nature, is essentially a hydraulic machine w/ various valving to force cylinders. It has 2 control panels with manual functions, and a CRT with something like 5 pages. A few months back, we had a thunderstorm roll through while we were making parts. The power cut out, and when it came back, the machine HMI wouldn't turn on. Figuring we blew something up, we started to diagnose.  Ultimately, the AD57(S1) board didn't have any lights on, neither did the Ay51, AY50S or NE21.  We flipped some new boards in, with no luck.  The screen randomly comes on, but can't get the machine to turn on the motor or do anything - regardless of screen functionality. Lately, we submitted the PLC boards to a repair shop, who said they replaced optocouplers among a few other components. We have reinstalled everything and did a hard reset on the machine.. Now i have an A2NCPU board with a constant ERROR light. I recently purchased the RS422 cable adapter and got GX Developer working. I was able to pull the program off the PLC, and it also seems that in the "Diagnostics --> PLC Diagnostics" page, I am getting error code 13, CAN'T EXECUTE P. Reading into some of the manuals, this appears to be a program call issue?  I'm not sure how to kick the PLC into any of the programs, or rebuild the startup procedure.. Looking for someone who can assist with this. I've done a bunch with PLC over the years, but MELSEC is not one i'm familiar with. I've attached the program for reference..  Thanks in advance! Happy to provide my cell number to discuss to anyone who would be willing to help. Happy holidays! Jason Niigata Original Program.rar