ModbusTCPSlave Mapping

[MarkM]

Hi All, 

I am trying to map a Generic_Modbus_TCP_Slave. All input data should be mapped to a structure and all the output data to another structure. There seems to be no convenient way to do this. Interestingly when I setup the device as Ethernet/IP I can very easily map the IO connection. 

The structure is also a mix of variable types where for example the first type is a DINT. There does not even seem to be a simple way to map from 2xWORD to a DINT.

This is the EtherNet/IP mapping.

EtherNet/IP Mapping

This is the Modbus-TCP mapping. The mapping displayed is the first object in the structure and is a DINT. I can't even see a method to map the 1st two words to this DINT.

Modbus-TCP Mappong

All ideas are welcome!

Thanks

Mark

[CraigEl]

What Schneider Electric product and version does this relate to?

[MarkM]

Hi Craig, 

I am programming a TM241CEC24T using Machine Expert V2.0.

The Modbus TCP device is a Cool Muscle servo (https://docs.myostat.ca/display/MYOS/CM1-T+User+Guide). It uses a PLCopen Motion Control library and the IO needs to be mapped to the AXIS_REF. It is very simple to map the EtherNet/IP IO. So far I ended updating the library to have a union with a multiple word structure. This at least simplified mapping for the Modbus-TCP variant.

Cheers

Mark

[Bastian_Schmitz]

If you would add values to an Mobdus TCP Server you could alterative also asign global variables to a fixed memory space like (%MW0). Then you could read directly via Modbus these values. This possiblity is not very well documentated.