Problem with Modbus TCP

  • StefanA

    StefanA - 2013-01-16

    Having trouble to control outputs and internal relay bits in my plc from Advanced Hmi software. I use Modbus TCP and have no problem with reading and writing holding registers. My plc outputs are maped to addresses 00257 and upwards and internal bits starts from 01024. Can map a indicator lamp to address 00257 and toggle the lamp from the plc. But I can't toggle the output from the Hmi software.

    • tbrew01

      tbrew01 - 2013-08-28

      hi stefan, Could you please give me any example on how you were writing to holding registers?

      I have a numeric list box, and would like to write the value every few seconds, do you have any ideas?


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