I am using the mitsubishi driver to pull data from an R series plc that communicates with the rest of the older plcs in the plant. The issue now is, the r series is setup to use M0 to M400,000.
I can see this in Gx works 3. If i try to read anything past M65535 in Ignition I get an error configuration response back.
What settings would i need to change to read these higher M values?
I'm not sure you can. IIRC, this is a MELSEC protocol limitation. Do you have other external devices that can read those higher addresses? If so, a wireshark capture of that would be valuable.
Upgrade to Ignition 8.1.47, it made a change to the Mitsubishi driver that allows addressing beyond 0xFFFF.
Allow addressing offsets beyond
0xFFFF(65535).
(not sure why the release note doesn't mention the driver...)