Applies To: |
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Summary: |
When using Modbus20/Modnet20 or
Modbus30/Modnet30, the protocols allow you to use the %M and %MW of
Unity addressing. However, it does not allow you to use the %I and
%Q addressing of the input and output register, respectively. How can we configure the variable tag defined in Citect to refer to those registers? |
Solution: |
Modbus flat addressing is not supported by
the Unity topological addressing. Therefore, in order to
incorporate those registers in Citect, we will need to map the I/O
to the internal storage in the PLC. Therefore, the registers which have the addressing of %Ix.x.x.x or %Qx.x.x.x need to be mapped to %Mxxxx and/or %MWxxxx. Then, we can use either %M or %MW addressing or the modbus equivalent format. |
Keywords: |
modbus, modnet, unity, address, conversion, input register, output register, %I, %Q |
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