Tags error when pooling data from an Allen Bradley PLC

Pete

• June 07, 2024 13:55

I get errors when I am pooling data from an Allen Bradley PLC if I don't activate : disable tags error in general/global settings/advanced parameters.

I don't understand the fonction of this parameter, can someone explain it to me ?

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• Official comment

  

  Hugh Whitefur

  • June 07, 2024 15:20

  "Disable Tags in Error" is a debug setting that disables polling tags if they have errors. Because tags are polled in batches, one tag with a bad address can block many other tags from polling. This setting helps you identify which tag has a bad address so that you can correct it.
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  Siobhan Chapman

  • June 07, 2024 15:23

  A single tag in error (truly bad) can cause a number of other (good) tags to appear in error as
  well because tag requests and responses are grouped in one single envelope for communication
  optimization purposes. The whole group is then affected with the same error status.
  During commissioning or maintenance, you may want to isolate the truly bad tag from the others.
  Therefore, you have to disable the polling of tags in error.

  That is from the application note on polling data from Allen-Bradley PLCs, you can read it here.

  Suggest you look into the reasons why you are getting the errors in the first place - more information on troubleshooting is in that application note.

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  Pete

  • June 11, 2024 11:43

  I had a tag with a typo, now it works. Thanks for your help!

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