Ron_S

I checked that and the list was missing too or filled with NOP's I couldn't clear the memory or anything.

No high temperatures or extremes of anything. A nice bedding company, a Printers, a cosmetic bottle-filling station and so on. Red error light flashing. I could get partial code out of some but with missing logic and yellow pages but none would allow programming or a new one to be downloaded. I even opened some PLC's to see if there was anything in common but they all looked perfect inside. I have one of them here on my desk - an FX1n 40mr. It looks brand new but even after a few weeks of sitting there it has the same fault and starts to communicate, then stops.   I agree, 20 - 25 years is a good run but it's causing chaos with factories that don't back-up.a

Has anyone else noticed that a lot of old FXnn plc's are starting to fail? By old, I think 20 - 25 years old.   It's just that in the last 12 months, I have had to attend about 10 FX plc's with the red error light and unrecoverable programs. Only one FX (you know, one of those big square things) was a flat battery that had never been changed. The rest were battery-less models. That is, apart from one FX2n - but the battery was fully charged on that one. Not only was it impossible to recover the program - they would not accept a program or allow a fault diagnosis.   Same fault across different industries.   Maybe take it as a reminder to back-up aging FX models. They are coming to the end of their life cycle.  

There is a link to the software on this page It's still active

You'll have to explain more...   Do you want a 1 second on, one second off output, when an input is on? Or.. an output on for just one second when an input is on.

I mean you will get warnings that the versions do not match. Ignore it and upload anyway.

I usually let sleeping dogs lie with version and firmware updates. If they were working perfectly before I came - they'll be the same versions when I have gone. Probably because I once 'bricked an E300 doing an unnecessary upgrade.

You start at the beginning. Check your pc has a usb to serial port showing - and what com port number it is. If you do, open a blank E100 project and go to Transfer. select Recieve and set the Com port to the same number.  

Of course - it can be confusing but Tim has now said he understands the double coil rule. So I thought it fair that there are exceptions. :)   

Unless you have a HMI connected - I wouldn't bother. The Mitsubishi internal clock is next to useless. It can gain nearly an hour over 1 year Probably why the past engineer did it manually.  

You can actually double-coil in certain circumstances. If they are within an STL sequence. Even then though it's better to use M coils and a bit of that M coil to operate the Y output outside of the STL sequence.

This was a one-off Panic and I would never advocate it. I thought about the repercussions later on but at the time I was new in the game and couldn't take the hit. I never worked for them again and they are long gone. It just reminded me of that story with this project.

Yep, The old E series HMI's are starting to fail regularly now. But some are very old in electronic terms and have been brilliant workhorses.

Of course there are Inntele. Time bombs are a touchy subject - but I have done it only once in 30 years of programming. And that was because I was warned by another contractor that they were very bad at paying. He had been owed £18000 for over a year.   I had been paid 50% before the job and the rest to be paid on completion (then I was warned by the contractor) I was upfront with the customer and told him the machine would stop in 2 weeks if I had not been paid - they assured me I would be paid (I wasn't, even though I phoned them a few times) It was amusing to me in a way because I set it for Friday morning and it would be triggered when the auto-stop button was first pushed. I expected a call around 09:30 after their 09:00 tea break but no call. Finally, at 11:00 they called. They were panicking as they had rush orders. I made them transfer the money to my bank and then told them how to take the trap off.  

A strange answer with no knowledge. The equipment was 25 or so years old and was never rented. They laughed when I told them about it   I found it unusual and quite funny so posted it here