# \[13069\] - Write value to Opc item feature for Expression Tags is no longer available in 8.0

**URL:** <https://forum.inductiveautomation.com/t/13069-write-value-to-opc-item-feature-for-expression-tags-is-no-longer-available-in-8-0/23112>\
**Category:** Ignition Early Access\
**Created:** [March 7, 2019, 8:44am UTC](https://forum.inductiveautomation.com/t/13069-write-value-to-opc-item-feature-for-expression-tags-is-no-longer-available-in-8-0/23112 "2019-03-07T08:44:59Z")\
**Posts on this page:** 1\
**Showing post:** 5

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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:** [May 11, 2019, 1:20pm UTC](https://forum.inductiveautomation.com/t/13069-write-value-to-opc-item-feature-for-expression-tags-is-no-longer-available-in-8-0/23112/5 "2019-05-11T13:20:28Z")

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This functionality as it was in 7.9 is not coming back.

Tags that had an OPC write-back defined now get a special “Legacy Value Changed” entry in the Tag Event Scripts:

 ![wb_script](https://us1.discourse-cdn.com/inductiveautomation/original/2X/3/315a80cd3f1d2dddb36e997a9e542fe499d0db97.png)

Tags that you want to add this functionality to should just use the regular Value Changed event to invoke `system.opc.writeValue`.

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_[View the full topic](https://forum.inductiveautomation.com/t/13069-write-value-to-opc-item-feature-for-expression-tags-is-no-longer-available-in-8-0/23112)._