GxWorks2 QCPU Modbus Register Allocation

[NBlackwell]

Hello,

I have connected my Modbus Master simulator to the QCPU and I can see that the QCPU (slave) is writing to numerous registers. For example, on the attached, you can see register 40,121 is -48.

How do I find what is writing to register 40,021 in the QCPU?

Thanks

 

[parky]

Here is the manual, I have never used the Modbus module however, special modules i.e. analog/communication etc. use buffer memories so it is probably linked to the addresses i.e. D, M, SD etc. for example the Modbus registers 40000 > could be D1000 >
http://dl.mitsubishielectric.com/dl/fa/document/manual/plc/sh080578eng/sh080578engj.pdf

Look at Section 7.