Author Topic: Monitoring PLC I/O  (Read 39 times)

DavidSr

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Monitoring PLC I/O
« on: April 05, 2025, 12:55:41 PM »
I posed this question in some form a few years ago and never got an answer.
Trying to monitor the in put and out put data table bits in a PLC 5/20E with any type of Advanced HMI indicator lights does not work. I have to also turn on a bit from a bit file when the real world input or output bit is energized and use that for the HMI indicator light
the
Does anyone else experience this? Anyone have an answer as to why I cannot assign an address from output or input image table to an Advanced HMI light?
David

Archie

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Re: Monitoring PLC I/O
« Reply #1 on: April 05, 2025, 01:16:31 PM »
There is a known issue with the PLC/SLC/Micro driver that you cannot use I/O addresses. You would have to copy the addresses to another table such as Bx or Nx, then use those in AdvancedHMI.


DavidSr

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Re: Monitoring PLC I/O
« Reply #2 on: April 05, 2025, 01:55:03 PM »
Thanks for clearing that up Archie.
I just put a bit file address in parallel in the logic or turn on a bit with an input address such as B3:1/1 and monitor it. Works for me. Nice to know I haven't lost all of my mind yet.
David