# Expression tag initializing with -1 value

**URL:** <https://forum.inductiveautomation.com/t/expression-tag-initializing-with-1-value/90401>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [May 15, 2024, 6:36am UTC](https://forum.inductiveautomation.com/t/expression-tag-initializing-with-1-value/90401 "2024-05-15T06:36:52Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Amol](https://avatars.discourse-cdn.com/v4/letter/a/a4c791/32.png) [@Amol](https://forum.inductiveautomation.com/u/Amol)\
**Post date:** [May 15, 2024, 6:36am UTC](https://forum.inductiveautomation.com/t/expression-tag-initializing-with-1-value/90401/1 "2024-05-15T06:36:52Z")

</div>

expression I am using is

```python
tag({operators_path}+ "CECOEL" +"/REG_ZON_CCGT/SRS/"+{TagName})

```

when I am restarting the gateway very first time then my expression tag value is becoming -1 from nowhere, the value of tag({operators\_path}+ "CECOEL" +"/REG\_ZON\_CCGT/SRS/"+{TagName}) can never be -1, its either 0 or 1.

I am suspecting that if the dependent tag ( i.e tag({operators\_path}+ "p1" +"/path/to/"+{TagName}) ) is not set to defined value then this behaviour is happening.

Anyone know about this?