# PLC Fault- Ignition HMI

**URL:** <https://forum.inductiveautomation.com/t/plc-fault-ignition-hmi/23968>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [April 9, 2019, 7:55pm UTC](https://forum.inductiveautomation.com/t/plc-fault-ignition-hmi/23968 "2019-04-09T19:55:03Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![shibubalaji](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/shibubalaji/32/9165_2.png) [@shibubalaji](https://forum.inductiveautomation.com/u/shibubalaji)\
**Post date:** [April 9, 2019, 7:55pm UTC](https://forum.inductiveautomation.com/t/plc-fault-ignition-hmi/23968/1 "2019-04-09T19:55:03Z")

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What could be done to show the tag error when PLC get fault. My PLC had a fault and it shuts all the equipment down but the tags on the Ignition HMI were tuck at its last position as “Running”. No tag errors, like a PLC down…  
How can I solve this issue?

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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:** [April 9, 2019, 8:09pm UTC](https://forum.inductiveautomation.com/t/plc-fault-ignition-hmi/23968/2 "2019-04-09T20:09:18Z")

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Monitor the quality of the tags to pick up connection breakage. Some drivers expose a diagnostic tag you can monitor. Otherwise, you might need a rolling counter or other heartbeat in your PLC that would indicated continued code execution.

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**Author:** ![shibubalaji](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/shibubalaji/32/9165_2.png) [@shibubalaji](https://forum.inductiveautomation.com/u/shibubalaji)\
**Post date:** [April 15, 2019, 1:35am UTC](https://forum.inductiveautomation.com/t/plc-fault-ignition-hmi/23968/3 "2019-04-15T01:35:55Z")

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Phil,  
Is that necessary to have expression tag to check the quality and value? If not, how do we get the active tag, if it lost the quality?

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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:** [April 15, 2019, 12:12pm UTC](https://forum.inductiveautomation.com/t/plc-fault-ignition-hmi/23968/4 "2019-04-15T12:12:11Z")

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> [@shibubalaji](#):
>
> Is that necessary to have expression tag to check the quality and value?

An expression tag that extracts the quality from another tag is one method, yes. Quality is included in tag bindings, though, so it will automatically trigger overlay graphics where used.

> [@shibubalaji](#):
>
> how do we get the active tag, if it lost the quality?

I'm not sure what you mean, here.