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Modbus TCP Input bits on Modicon M340
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Posted: 2022-03-1610:22 PM
Traditional ModBus addressing vs IEC ModBus addressing
In all cases, note that the traditional ModBus address starts at 1 and the IEC ModBus address starts at 0.
Input bits 1xxxx1 become %1xxxx0
Input words 3xxxx1 become %IWxxxx0
Output bits 0xxxx1 become %Mxxxx0
Output words 4xxxx1 become %MWxxxx0
Input bits and input words can only be read by an external device.
If you wish to simulate/ manipulate these values in your application you can do this using the Simulation function blocks. Refer to the Help file for WRITE_INPUT_EBOOL as an example.
Output bits and output words are Read/ Write capable.