Renjith

As JRoss suggested, select the full value scale from -/+20mA. Once the digital signal drops below minimum(find out digital value corresponding to 4mA), consider cable to be broken.

It's better to use USB. Buy a normal Printer USB cable, it will work. Once you plug in the cable, you might have to install driver from C:Melsec/Easysocket/USBDrivers.

In GX Works2, Activate simulation. In GT Designer 3, open the project which you wish to simulate. Go to Tools> Simulator> Set and then select GX Simulator2 instead of GX Simulator. Now Activate simulator in GT Designer and it will work.

Unlike Q series, FX series PLC doesn't allocate IO address to SFM's. As crossbow told, it will just reduce the total IO points by 8.

To add a new cclink module, Open the current program(or read program+paramters from plc). Go to network parameters> cc-link parameters. In cclink parameters, Increase total modules connected to 3 (1 GOT and 2 remote inputs). In station information settings, make station 2 & 3 to remote IO station.. Download parameters and recycle power, your remote modules will be live without error. Cheers, Renjith