# Counter Gateway Tag Change Script Issue

**URL:** <https://forum.inductiveautomation.com/t/counter-gateway-tag-change-script-issue/37361>\
**Category:** Ignition\
**Created:** [August 4, 2020, 2:46pm UTC](https://forum.inductiveautomation.com/t/counter-gateway-tag-change-script-issue/37361 "2020-08-04T14:46:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![vasilevdim](https://avatars.discourse-cdn.com/v4/letter/v/7ba0ec/32.png) [@vasilevdim](https://forum.inductiveautomation.com/u/vasilevdim)\
**Post date:** [August 4, 2020, 2:46pm UTC](https://forum.inductiveautomation.com/t/counter-gateway-tag-change-script-issue/37361/1 "2020-08-04T14:46:30Z")

</div>

Hello,  
I have the following Gateway Tag Change Script on a tag “Counter”:  
‘’’ if not initialChange:

```
    currentValue = event.getCurrentValue().getValue()
    previousValue = event.getPreviousValue().getValue()

    if previousValue > currentValue or currentValue == 0:

          sc = system.tag.readBlocking(["[default]UNI_Room12/StartCount12"])[0].value
          brb = system.tag.readBlocking(["[default]UNI_Room12/BatchResetBit12"])[0].value
          pv = system.tag.readBlocking(["[default]UNI_Room12/PreviousBatchCount12"])[0].value
          pv = pv + previousValue

          tagPaths = ['[default]/PreviousBatchCount', '[default]/BatchResetBit']
          values = [pv, brb+1]
          system.tag.writeBlocking(tagPaths,values)

    if currentValue > previousValue or previousValue == currentValue:

         sc = system.tag.readBlocking(["[default]UNI_Room12/StartCount12"])[0].value
         cc = system.tag.readBlocking(["[default]UNI_Room12/Counter"])[0].value
         pv = system.tag.readBlocking(["[default]UNI_Room12/PreviousBatchCount12"])[0].value
         total = pv - sc + cc
         system.tag.writeBlocking(["[default]Total"],[total])'''

```

The script works well, however randomly I have the following problem:  
as you can see on the attachment, though the previous value of the counter (65292) is not greater than the current value (66848), the value of the brb variable goes from 0 to 1, i.e. the first part of the script was executed. Any idea why?

 ![strange](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/c/ac2c40053c537f0610d39d8dbc1f059e7eb6d3c8.png)