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Tag Communication Limits - Mike_MHM - 27-06-2022

HI There

Are there any further settings or tricks that can employed for the following issue reading tags from a AB PLC?

Have AB Compaclogix (L320ERMS..) and have about 400 Tags to be read and sent to a cloud service. (which works)

The eWon only seems to capable of reading 70 odd tags; before it won't read tags and marks these as "no communication."
Really seams to hit UDT based tags more than native.
If I delete some working ewon variables, some more previously marked "no communication" can then be read; But that is not a hard rule.  If I delete the majority of the variables, then there are still a range of tag variables that won't read.
I know the PLC Tag names and addresses are correct because the generation is all via a script feed a TAG export from the PLC. (using eWOn tag generator)


The logs are full of the following pattern

  • stdios-Protocol Error reading Tag (ABLOGIX - SV012_DisEngageMin - Polling disabled for this tag)
  • ablsrv-CIP Error Code in Reply: (30)

I know the PLC data in those tags is correct, and the name does certainly exist.

Work arounds I've tried
  • I've tried setting the "disable tags in error"
  • Changed the timeout
  • Tried splitting tags across different severs
  • Changed the pole rate of the servers


RE: Tag Communication Limits - Jean-Yves - 04-07-2022

Hi,

Difficult to say what is going on here. I think the best is that you open a support ticket on https://mysupport.hms.se/en-US/ to investigate further your problem.

If possible, give us access to your Ewon, the PLC back-up or tag list from the PLC and Ewon back-up.

RE: Tag Communication Limits - UrbanSpaceman - 26-05-2025

Hello,

 I see that this is a few years old at this point, but was there any guidance that came from this thread? I am experiencing the exact same error logs. I don't seem to have the problem with tag capacity, but every few days, all the tags stop pulling from the PLC, a ControlLogix. Clicking Initialize on the ABLOGIX IO Server page seems to get everything started again, but I am wondering why this is happening. As some additional thoughts, within the last several weeks, I upgraded the controller of the PLC to a new model running a newer firmware of Logix (v20 to V35).