# How do you change so if a poll fails ignition does not write a value of 0?

**URL:** <https://forum.inductiveautomation.com/t/how-do-you-change-so-if-a-poll-fails-ignition-does-not-write-a-value-of-0/31779>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [January 30, 2020, 4:27pm UTC](https://forum.inductiveautomation.com/t/how-do-you-change-so-if-a-poll-fails-ignition-does-not-write-a-value-of-0/31779 "2020-01-30T16:27:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dbaillie](https://avatars.discourse-cdn.com/v4/letter/d/f08c70/32.png) [@dbaillie](https://forum.inductiveautomation.com/u/dbaillie)\
**Post date:** [January 30, 2020, 4:27pm UTC](https://forum.inductiveautomation.com/t/how-do-you-change-so-if-a-poll-fails-ignition-does-not-write-a-value-of-0/31779/1 "2020-01-30T16:27:36Z")

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Is there somewhere that we can change that if a poll fails it does not populate a zero in ignition? Have it either do nothing on failed poll or even use last value? We are using ignition 8.0.7 and perspective mainly.

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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 30, 2020, 4:28pm UTC](https://forum.inductiveautomation.com/t/how-do-you-change-so-if-a-poll-fails-ignition-does-not-write-a-value-of-0/31779/2 "2020-01-30T16:28:26Z")

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Can you go into more details about what driver you’re using and where you’re seeing a 0? That’s not the behavior for any of our drivers.

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**Author:** ![dbaillie](https://avatars.discourse-cdn.com/v4/letter/d/f08c70/32.png) [@dbaillie](https://forum.inductiveautomation.com/u/dbaillie)\
**Post date:** [January 30, 2020, 4:35pm UTC](https://forum.inductiveautomation.com/t/how-do-you-change-so-if-a-poll-fails-ignition-does-not-write-a-value-of-0/31779/3 "2020-01-30T16:35:34Z")

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All of our tags are udt’s getting information from a opc client. We use autosol to poll the emerson devices in then through opc to get the values to ignition. When we have to shut down a comm channel and ignition tries to poll it seems to write a zero value in can see it in the trends especially:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/4/428c84f5da674b12a091a204ad39f6b0b8059521.png)  
Not sure if the screen shot loads but that is a battery voltage trend and everytime we lost comms it populates a zero.