Gambit

You have a GOT ??? just used the same (GOT)device for the Graph meter and numerical display.s

Latest version GX Developer is 8.503Z release 30-10- 2018  

The FX0 is maybe a little to old. The current PLC is FX5. so you;ve missed the models 1.2.3 in between. This wouldn't be an issue with those models. and the FX5 have ethernet as a standard. The program can be converted if this is a big problem.

Strange I've never encountered this message. Normally the Software will stop the PLC if it is in run when you do a download and start it again after. If you don't use entry data monitor yourself. Have the select switch in Stop mode. Use GX Dev to start the PLC. Then try a download. GX Should stop the PLC and start it again after it is finished downloading.

That is correct you can only use the Run and Stop Devices if the switch is in STOP mode. Then do you get this error ? When the PLC switch is in STOP and You have set the PLC  to run via the M Devices?      

Goedemorgen Jimmy, Instead of a serial ethernet converter you could also have used a small got (Mitsubishi HMI) with ethernet. The programming software already supports that so you do not need a COM to IP software on your PC.  

That is not how it works. The template (registration) function is so that when you use it you can change the attributes accordingly. So if you place your template on the screen you only have to adjust the things you want to adjust.    

As you already mentioned I would use the the device memory to send the Data. And create a Dut or Array in the global list    

Right mouse click on your variable list in GX works 3 will give you an import and export option. But If you're are going to make an array than it just two entries  

You already have the FX5-ENET/IP module. It's just been released.   Do you have: GX Works3 (Ver. 1.050C or later) EtherNet/IP Configuration Tool for FX5-ENET/IP (Ver. 1.00A or later) X5U/FX5UC (Ver. 1.110 or later)

As far as I know there is an PC utility for CC-Link IE Field. There is a CC-Link IE Field Basic plugin for Wireshark. https://www.cc-link.org/en/downloads/ie_utility/form.html I suggest you buy a small FX5 as a master they are not very expensive.  

Which Inverters are you using ? The new FR-E,  FR-A, FR-F can be bought with integrated ethernet which support CC-Link IE Field basic which is also supported on the FX5U standard ethernet port.

Which version are you using ? In which GX Works 2 mode are you (Read)??