m340 system tag addressing in decimal

I would like to read the system tags (%S, %SW) from a m340 processor into my HMI/Historian. I am using kepserverEX OPC server and it uses addressing in decimal tags (000001 and 400001) for modbus tags (%M %MW).

What would the system tags be in decimal addressing in Kepware?

as far as I know you can't read the %S coils and %SW registers directly over modbus. You will have to copy them to %M and %MW in your program and then read those copies.