[fx2n STOPS WHENEVER i run on my back up power]

Sorry to disagree but it should be possible to talk to eachother using the COM-et10 module. I think i have a small program somewhere. I'll try and find it!!!

[QnAS High Speed Counters]

After a FEND instruction create the Counting program. In the area left of the ladder input I28 or higher. I28 till I31 will run very ...mS according to the parameter settings

[I can't connect to FX1N - error message]

Make sure the port parameters in the terminal are the same for RS232 and RS485 port. In GX Developer be sure that the transparant mode in on.

[mitsubishi ethernet communication module]

Sounds like simple Fixed buffer comm to me which CPU are you using ? Oops you're using FX i thought A or Q

[Melsec FX24MR-UA1 Manual]

The PLC you are using is from the FX series, any manual from this series will do. The 24 stands for the total amount of in and outputs. the MR is means you are using relais outputs. You can download the manuals from the www.mitsubishi-automation.com website. You have to registrer to be able to download manuals

[GOT1000 (GT1150) PC COMMUNUCATION PROBLEM]

I agree a USB cable is much easier. If not you probably need the following cable It's for connection a GOT1000 to a Mits PLC via RS232 but that has the same port as a PC.

[Saving register values]

Which version of GX Developer are you using. I've done it many times with GX Dev & GX IEC Dev without problems. If you're using windows XP make sure GX Developer is at least verison 8

[FX PLC and Modbus]

If you use GX IEC Developer there is a FB library called ModbMFX. You can download it for free from www.mitsubishi-automation.com. It contains all the info on how to use the modbus protocol over RS485BD

[Which PLC?]

Why not try a simple Mitsubishi FX1N PLC with a FX2N-2AD card. It has a resolution of 1.25mV when used 0-5V.

[Sharing of software in forums]

GX Developer is the easiest replacement. You can directly read programs written in melsec medoc dos, mm FX Win and GPP. In the demo software download on this site you can download a free 1000 step version. Download code => Mitsubishi=> demo software

[FX3U-ENET and FX3U-64DP-M]

You definitely need GX DP to download the GSD files for the network. Your downloading problem is because you linked the GX DP & GX IEC Developer via MX Change. But the server wasn’t activated. Diagnostic for the Q is simple just go to the autorefresh setting there you can get BFM information direct into dataregisters without using TO & From instr. These wil give info like (BFM 2112 ...) which nodes are online (BFM 2040 ….2079) comm. Problems. This way you don’t have to start the server. If you go to the BMP dir of your installed package you will find bitmaps which you can use although you normally get them with your GSD file