# Transaction groups writing last know value rather than null

**URL:** <https://forum.inductiveautomation.com/t/transaction-groups-writing-last-know-value-rather-than-null/33029>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [March 11, 2020, 10:05pm UTC](https://forum.inductiveautomation.com/t/transaction-groups-writing-last-know-value-rather-than-null/33029 "2020-03-11T22:05:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![neill](https://avatars.discourse-cdn.com/v4/letter/n/edb3f5/32.png) [@neill](https://forum.inductiveautomation.com/u/neill)\
**Post date:** [March 11, 2020, 10:05pm UTC](https://forum.inductiveautomation.com/t/transaction-groups-writing-last-know-value-rather-than-null/33029/1 "2020-03-11T22:05:44Z")

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Hello,

Just wondering how I can get my transaction group to write null as opposed to the last known value when the connection is lost? The transaction group is looking at tags provided by the AB OPCUA driver which is connected to a MicroLogix 1400.