Walden

Thanks for all your replies. It's a long time since I programmed a FXoS and I had forgotten the various device adresses. Yes, there are FX details on the Mitsi site but not the FXo series. Three hours later: Yes the information is there! It's under "Manuals" I was looking at "Catalogues". Back to school for me!

Thanks Rodney, I'm on site not a million miles away from you with an old control panel in which I was assured was a FX1S! Your information has got me out of a big hole and a return visit! By the way, which Mitsubishi site should I have tried? I've looked through what I thought was the main site with no luck.

Does anyone know where I can download a copy of the instruction manual for a FX0S? All I want to know is the number of the data registers, timers, counters etc and which are battery backed.

With Medoc I use a SC-03S2 RS232/485 converter. What do I need with GX?

Make sure that on the Medoc print screen you have highlighted the Ladder and not the Raw Ladder option. Also, are there comments showing when you list the program? If not, they may not have been written!

I had trouble with this on Windows XP just the other day. In the Medoc Print screen I chose the print to file option. I then opened the file with Word and chose the "open with OEM US" option: all OK!

Working on old control panel circa 1986 which has Cutler Hammer D100 PLC. These were Toishiba PLCs with CH's label. Is there a site where I can obtain programming software and PC to PLC connecting cable, ot should I scrap it and start again?

If you type "Medoc 2.41" in your search engine you will find a number of sites which offer downloads of the various Medoc programs.

OK, here goes! For two pumps, program two latch relays. The lower latch relay in the ladder will enable the first motor. The second latch relay above the first, will enable the second motor. The first loading pulse signal will set the first latch relay which will enable the motor output and, when the loading pulse hits it, switch on the first motor. The first latch relay will enable the second latch relay and the second latch relay will disable the first latch relay when it is set. The second loading pulse will set the second latch relay and enable the output circuit for the second motor and when the second loading signal hits it, switch on the output. You will need a relay at the top of the ladder to accept the thrid loading pulse and reset the second latch relay. Do the same thing with two more latch relays which will switch off the motor outputs as they receive an unloading pulse. You will have to stop the loading signal when both motors are running and stop the unloading signal when both motors have stopped. This can be expanded to any number of motors, within the limits of the PLC. Sketch it out in ladder format and remember that the scan goes from top to bottom.

No problem! This requirement is one of the joys of PLCs! You need to set up two ring counters with latching relays. The first ring counter loads, and sets the latching relays which in turn switch on the outputs to the pumps. The second ring counter responds to the unloading signal and resets the latching relays and hence the pumps. I’ve used this system on fifty or sixty sites, regulating compressors, pumps and general motors to obtain a degree of equal wear.

I don't believe that I have any F1 PLCs, but I do have many F2's and up to A1S's dotted about the UK. I can go to any site armed with Medoc and work on any of them using the Medoc. Now I'll have to use different versions of GX. The best I can get with XP and Medoc is a 3/4 screen - it'll do until I embrace GX. Wish me luck!

Thanks for all your comments. I have so many Mitsubishi PLCs on site programmed with Medoc that I am dragging my feet to change completely to GX. But now I have XP on my office based PC, I shall have to take the leap!

Yes, tried that - didn't work! It may not run full-sixed in XP.

Does anyone know how to run Medoc 2.41 in full screen mode when using Windows XP?