HMI Pad › Forums › Main Forums › HMI Pad Support › Compactl Logix Write to PLC Issue

This topic contains 4 replies, has 2 voices, and was last updated by  mohrland 2 years, 5 months ago. This post has been viewed 2677 times

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  • 26 April, 2017 at 13:35 #21865

    mohrland
    Participant

      Hello,

      Having an issue writing data to an AB Compact Logix PLC. So far I have made a few buttons, labels, and number fields. Basically everything reads values from the PLC but I have not been able to write anything to the PLC.

      Item: Pushbutton
      Value: CompactLogix.pb

      Tag Info
      Name: pb
      write_expression: CompactLogix.pb

      Any ideas?

      26 April, 2017 at 14:34 #21866

      gregM
      Participant

        Hi moorland,
        the write_expression on the PLC Tag is supposed to be switch_name.value

        so if you have a start switch with the name startSwitch you would put startSwitch.value into the write_Expression field of the PLC Tag.

        26 April, 2017 at 15:59 #21867

        mohrland
        Participant

          I had tried that previously but there was an error message. Unfortunately I couldn’t see it because it was hidden under the keyboard. I’ve experienced that a lot. I’ll try it again later, hopefully I had I typo.

          Thanks

          26 April, 2017 at 16:21 #21868

          gregM
          Participant

            if you can, send me your project (greg (at) rite control.com) and I’ll see if I can figure it out.

            28 April, 2017 at 1:04 #21869

            mohrland
            Participant

              Greg,

              Thanks for the help! I got it working.I misspelled the button name.

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