# 'No Pending Request' after PLC power off

**URL:** <https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646>\
**Category:** Ignition\
**Created:** [January 27, 2020, 5:10pm UTC](https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646 "2020-01-27T17:10:19Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![grietveld](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/grietveld/32/6984_2.png) [@grietveld](https://forum.inductiveautomation.com/u/grietveld)\
**Post date:** [January 27, 2020, 5:10pm UTC](https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646/1 "2020-01-27T17:10:19Z")

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Not sure if its something wrong on my configuration or if its a potential bug. We had a AB PLC powered down on the line for some maintenance, and the logs started getting spammed with ‘No Pending Request’ messages. I went to the details page for the device, and it showed a significant load factor(I am guessing the max).

Disabling and re-enabling the device seems to have fixed the issue for now, but figured I’d post here in case there is something I can fix for next time, or if it is indeed a bug.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/8/8d85eb81d66360e5dde3215de5dc57fe0c188cdb.png)

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/9/9784591a7e8f871c1dc41eae1a0b1e30f2e78da3.png)

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [January 27, 2020, 5:19pm UTC](https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646/2 "2020-01-27T17:19:35Z")

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Seems weird, since that warning is about requests/responses between OPC UA client and server.

What version of Ignition is this? Do you have scripts doing explicit reads or a read mode scan class / tag group pointing at this device that went offline?

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<div class="post-metadata">

**Author:** ![grietveld](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/grietveld/32/6984_2.png) [@grietveld](https://forum.inductiveautomation.com/u/grietveld)\
**Post date:** [January 27, 2020, 5:21pm UTC](https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646/3 "2020-01-27T17:21:50Z")

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Version 8.0.7.

We do have a couple of gateway timer scripts that pull from a couple of tags, but they run at a much slower rate than those messages were appearing. Other than that, transaction groups are connecting to it.

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**Author:** ![mdia](https://avatars.discourse-cdn.com/v4/letter/m/ce73a5/32.png) [@mdia](https://forum.inductiveautomation.com/u/mdia)\
**Post date:** [January 13, 2021, 7:19pm UTC](https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646/4 "2021-01-13T19:19:46Z")

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Same thing happening here. Gateway gets flooded with this error whenever we power off the device (AB PLC). Any details/reason on why this happens is much appreciated.

Ignition version 8.0.16

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [January 13, 2021, 7:29pm UTC](https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646/5 "2021-01-13T19:29:49Z")

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If it’s reliably reproducible then you should call support and let them take a look. Maybe something will become clear with a Wireshark capture or some logging enabled.

Without more information I can’t see the link between these OPC UA related log messages and a device being offline. They shouldn’t be connected like that.

Which driver is being used in this case?

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**Author:** ![mdia](https://avatars.discourse-cdn.com/v4/letter/m/ce73a5/32.png) [@mdia](https://forum.inductiveautomation.com/u/mdia)\
**Post date:** [January 13, 2021, 8:10pm UTC](https://forum.inductiveautomation.com/t/no-pending-request-after-plc-power-off/31646/6 "2021-01-13T20:10:29Z")

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Thanks for the rapid response Kevin. The Allen-Bradley Logix Driver is what we’re using.