Ron_S

If it is wired with 0V at the common terminals - then 24V will be the common for whatever the outputs are powering. When the output is off, the 24v will come back through the coil (giving a false 24V really) When the output is on it will now be 0v (or negative)

D0 or DO?  However, the outputs can be supplied on the common terminal with 0V and 24V can be the common for the relays/contactors in the panel. It's the practice in Japan and often Chinese machines. The S/S is just for input signals

Show us how far you have got and we will gladly assist you. A tip: If timer = 1 then ?

This is just information that might help someone in the future. I was called to a job where the above PLC had fault lights on.  When I connected, there was no program inside.?? They had a back-up program so I downloaded it and all seemed OK. Then the error light started flashing again. Once again, the program was missing.   Short version: They rushed out to buy a new one, I installed it, put the program in and they were back up and running with no issues.   Later, in my office, I opened the PLC to see if there was anything obvious. There wasn't. If you have ever opened an FX plc - they are a marvel of micro electronics with virtually no replaceable parts. (obviously output relays and transistors but that was not the problem) I have lots of 2nd hand FX plc's so I swapped out the 1.0Fsupercapacitor from one. More in hope than anything else. That was the problem - it worked perfectly. A £3 supercapacitor fix. 

put more pin holes in the disk and recalibrate

Does anyone else suffer from this strange anomaly? If I save a program using GX Works 2 onto my laptop hard drive - everything is fine and I can open it again at any time. If I save it to a USB memory stick, once again, I can reopen it with the laptop, no bother. But... If I then put the USB into my main PC, I immediately get an error that the USB is corrupt and needs repairing. If I 'repair it' the GX file will not open. If I ignore the repair message - I can open the program and everything is fine. I can save it to the PC hard drive or the USB. This is the same with any USB stick Same operating system (win 10) on both.    

Yes, it has to be part of the routine of connecting to a plc - check which com port is being used by the adapter

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

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.  

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

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.

I am in the process of upgrading an E300 HMI to the E1000 range for a customer The old HMI keeps failing and going blank. I managed to get the old program out while it was working for a short while. A nice little job sat at my desk replicating the program.   I came across this block  

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

An unreferenced block with a trigger of D502? Here's what was in it. (and I have edited it as it contained the rudest word)  

It means you don't have a coil for those 'bits. Nothing to worry about.