# S7400 driver Error caused by Gateway Tag Change Script

**URL:** <https://forum.inductiveautomation.com/t/s7400-driver-error-caused-by-gateway-tag-change-script/40762>\
**Category:** Ignition\
**Created:** [November 18, 2020, 2:27pm UTC](https://forum.inductiveautomation.com/t/s7400-driver-error-caused-by-gateway-tag-change-script/40762 "2020-11-18T14:27:20Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![dld3714](https://avatars.discourse-cdn.com/v4/letter/d/b2d939/32.png) [@dld3714](https://forum.inductiveautomation.com/u/dld3714)\
**Post date:** [November 18, 2020, 2:27pm UTC](https://forum.inductiveautomation.com/t/s7400-driver-error-caused-by-gateway-tag-change-script/40762/1 "2020-11-18T14:27:20Z")

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I’ve got an issue with a S7400Driver. The logs show…

No optimized AddressBlock list found for items: [com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@3ca46c7b, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@47ed0058, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@3fc0d3c7, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@583918d0, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@47e16018, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@6821477c, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@5146ff54, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@41299234, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@d84cba9, com.inductiveautomation.xopc.server.addressspace.contexts.WriteContext$PendingDriverWrite@6ffc67c2]

I also get a “Provider” error…

[[default]Barth2/Grinding/GCS PLC/Plant Tank Levels/L7 Level] Error writing to OPC address [[Ignition OPC-UA Server][S70]DB51,REAL180]. Result code: [Bad\_Timeout] The operation timed out.

If a disable a Gateway Event Script (TagChange). The errors go away.

Here’s the script…

l5lvl = system.tag.read(“Liquor Pumping/L5 Level”)  
system.tag.write(“Barth2/Grinding/GCS PLC/Plant Tank Levels/L5 Level”,l5lvl.value)  
l6lvl = system.tag.read(“Liquor Pumping/L6 Level”)  
system.tag.write(“Barth2/Grinding/GCS PLC/Plant Tank Levels/L6 Level”,l6lvl.value)  
l7lvl = system.tag.read(“Liquor Pumping/L7 Level”)  
system.tag.write(“Barth2/Grinding/GCS PLC/Plant Tank Levels/L7 Level”,l7lvl.value)  
l8lvl = system.tag.read(“Liquor Pumping/L8 Level”)  
system.tag.write(“Barth2/Grinding/GCS PLC/Plant Tank Levels/L8 Level”,l8lvl.value)

The thing is, the script works and the data is moving to the Data Block in the PLC. The PLC is a Siemens S7-410.

Anyone have any ideas why it works, but throwing all these errors.

Thanks.

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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:** [November 18, 2020, 2:32pm UTC](https://forum.inductiveautomation.com/t/s7400-driver-error-caused-by-gateway-tag-change-script/40762/2 "2020-11-18T14:32:08Z")

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What version of Ignition are you using? This looks like it could be the result of a bug that was fixed in 7.9.16.

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**Author:** ![dld3714](https://avatars.discourse-cdn.com/v4/letter/d/b2d939/32.png) [@dld3714](https://forum.inductiveautomation.com/u/dld3714)\
**Post date:** [November 18, 2020, 2:57pm UTC](https://forum.inductiveautomation.com/t/s7400-driver-error-caused-by-gateway-tag-change-script/40762/3 "2020-11-18T14:57:18Z")

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Version is 7.9.9 (b2018081621)

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<div class="post-metadata">

**Author:** ![dld3714](https://avatars.discourse-cdn.com/v4/letter/d/b2d939/32.png) [@dld3714](https://forum.inductiveautomation.com/u/dld3714)\
**Post date:** [November 20, 2020, 11:58am UTC](https://forum.inductiveautomation.com/t/s7400-driver-error-caused-by-gateway-tag-change-script/40762/4 "2020-11-20T11:58:56Z")

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Anyone have any further thoughts on this issue.  
I’d like to enable the Tag Change script again.  
TY

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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:** [November 20, 2020, 1:22pm UTC](https://forum.inductiveautomation.com/t/s7400-driver-error-caused-by-gateway-tag-change-script/40762/5 "2020-11-20T13:22:32Z")

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I guess it wasn’t obvious enough from my post - you should try upgrading to the latest 7.9 version available.