# Allen Bradley SLC communication overload

**URL:** <https://forum.inductiveautomation.com/t/allen-bradley-slc-communication-overload/117096>\
**Category:** Ignition\
**Tags:** ignition83\
**Created:** [September 16, 2026, 9:09am UTC](https://forum.inductiveautomation.com/t/allen-bradley-slc-communication-overload/117096 "2026-09-16T09:09:51Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [September 16, 2026, 12:21pm UTC](https://forum.inductiveautomation.com/t/allen-bradley-slc-communication-overload/117096/3 "2026-09-16T12:21:53Z")

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> [@pgmo](#):
>
> Shall I worry?

Yes. Any overload above a few percent indicates a real problem--your tags aren't being scanned at the configured pace.

> [@pgmo](#):
>
> How can I improve?

Check your PLC's status file for these settings, first:

> [@Typical Performance between Ignition and AB SLC 5/05](https://forum.inductiveautomation.com/t/typical-performance-between-ignition-and-ab-slc-5-05/17262/3):
>
> Check “Comms Servicing Selection” and “MSG Servicing Selection” for channel 1 (S:2/15 & S:33/7). If either is set, it will crush your throughput, as only one request will be processed per scan (Comms) or per certain control flow instructions (MSG).

Be aware that if throttled with those settings, unthrottling will impact PLC scan time.

Otherwise, there's not much you can do other than reduce the number of tags monitored.

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