# Double trigger on tag Value Changed script **URL:** \ **Category:** Ignition\ **Created:** [September 20, 2023, 8:11pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418 "2023-09-20T20:11:05Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![pjgonzales](https://avatars.discourse-cdn.com/v4/letter/p/59ef9b/32.png) [@pjgonzales](https://forum.inductiveautomation.com/u/pjgonzales)\ **Post date:** [September 20, 2023, 8:11pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/1 "2023-09-20T20:11:05Z")
I have a boolean tag that occasionally gets set TRUE from a PLC. The tag has a value change script that should run when its value becomes TRUE but for some reason its running the script when it goes TRUE and again when it goes FALSE. I tested it by turning it into a memory boolean and toggling it myself. The script begins as such: ```auto if not initialChange: if currentValue.value == True: "area where scripting magick happens" ``` I'm a little lost as to why it would trigger when the tag goes into the FALSE state, and any input would be much appreciated. ---
**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:** [September 20, 2023, 8:22pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/2 "2023-09-20T20:22:02Z")
Can you prove that's actually what's happening? Add print statements to the "magick": ```python if not initialChange: if currentValue.value == True: print "initialChange=%s currentValue.value=%s" % (initialChange, currentValue.value) # area where scripting magick happens ``` Also, copy all of your script into an external editor and make sure it's all tabs or all spaces. There was another thread with weird behavior recently that was caused by a mix of tabs/spaces in the script. ---
**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\ **Post date:** [September 20, 2023, 8:26pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/3 "2023-09-20T20:26:38Z")
And don't forget that you can just use, `if currentValue.value:` This will return a logical `True` or `False` and the logic will respond correctly. For False testing use, `if not currentValue.value:` ---
**Author:** ![pjgonzales](https://avatars.discourse-cdn.com/v4/letter/p/59ef9b/32.png) [@pjgonzales](https://forum.inductiveautomation.com/u/pjgonzales)\ **Post date:** [September 20, 2023, 8:28pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/4 "2023-09-20T20:28:59Z")
It's all tabs, I've gone through and checked multiple times. I have posted the entire script below, minus the "magick" part, which was just supposed to be a placeholder. After running calculations it's writing an adjusted value back to a single tag for now, during my testing phase, and when I set the boolean tag to TRUE I can see the value in the other tag change. If I set the boolean tag to FALSE, I see the value in the other tag change a second time. ```auto if not initialChange: if currentValue.value == True: for i in range(0,19): for x in range(1,96): value = system.tag.read("[.]ARRAYS/ARRAY "+str(i)+"/MEMBER "+str(x)) system.tag.write("[.]DATA["+str(i)+","+str(x-1)+"]", value) for i in range(0,95): values = [] for x in range(0,19): calc = system.tag.read("[.]DATA["+str(x)+","+str(i)+"]") values.append(calc.value) cValue = system.math.median(values) system.tag.write("[.]MEDIANS[0,"+str(i)+"]", cValue) Enable = True if Enable == True: for i in range(1,97): Mode = True medianValue = system.tag.read("[default]PACKAGING/LINE 6/CAMERA/CAMERA DATA/MEDIANS[0,"+str(i-1)+"]").value flowSP = system.tag.readBlocking("[default]PACKAGING/LINE 6/HUEFT/OVERFILL PER VALVE/VALVE"+str(i)+"/SP_TIMER_FLOWRATE")[0].value AutoMode = True if Mode == True and AutoMode == True: if medianValue >= 980: adjustedFlow = flowSP + 12 elif 980 > medianValue >= 920: adjustedFlow = flowSP + 6 elif 920 > medianValue >= 880: adjustedFlow = flowSP + 3 elif 720 > medianValue > 700: adjustedFlow = flowSP - 3 elif 700 > medianValue > 640: adjustedFlow = flowSP - 6 elif 620 >= medianValue >= 0: adjustedFlow = flowSP - 12 elif medianValue == -1: adjustedFlow = flowSP # system.tag.write("[default]PACKAGING/LINE 6/HUEFT/OVERFILL PER VALVE/VALVE"+str(i)+"/SP_TIMER_FLOWRATE", flowSP) system.tag.write("[default]Scratchpad/testFlow["+str(i-1)+"]", adjustedFlow) if i == 1: system.tag.write("[default]PACKAGING/LINE 6/HUEFT/OVERFILL PER VALVE/VALVE1/SP_TIMER_FLOWRATE", adjustedFlow) ``` ---
**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\ **Post date:** [September 20, 2023, 8:34pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/5 "2023-09-20T20:34:38Z")
> [@pjgonzales](#): > > It's all tabs, I've gone through and checked multiple times. When I paste your code into Notepad++ I can see that lines 8 to 14 have three tabs and then multiples of four spaces. I don't think that's your problem though. ---
**Author:** ![pjgonzales](https://avatars.discourse-cdn.com/v4/letter/p/59ef9b/32.png) [@pjgonzales](https://forum.inductiveautomation.com/u/pjgonzales)\ **Post date:** [September 20, 2023, 8:43pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/6 "2023-09-20T20:43:50Z")
Naturally, just because I said I had checked, the gremlins added spaces. ---
**Author:** ![pjgonzales](https://avatars.discourse-cdn.com/v4/letter/p/59ef9b/32.png) [@pjgonzales](https://forum.inductiveautomation.com/u/pjgonzales)\ **Post date:** [September 20, 2023, 9:38pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/7 "2023-09-20T21:38:49Z")
Because this script is in a tag event, where would I find the print output? I see nothing in the console or the log files. ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [September 20, 2023, 9:43pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/8 "2023-09-20T21:43:56Z")
In the wrapper log. (Don't use `print` in gateway scope. Use a logger.) ---
**Author:** ![pjgonzales](https://avatars.discourse-cdn.com/v4/letter/p/59ef9b/32.png) [@pjgonzales](https://forum.inductiveautomation.com/u/pjgonzales)\ **Post date:** [September 20, 2023, 11:08pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/9 "2023-09-20T23:08:53Z")
Well, I got it working by adding an evaluation of the currentValue to the script at line 45: ```auto if i == 1 and currentValue.value == True: system.tag.write("[default]PACKAGING/LINE 6/HUEFT/OVERFILL PER VALVE/VALVE1/SP_TIMER_FLOWRATE", adjustedFlow) ``` I can't tell if its triggering the script twice and only writing once or if its actually triggering the script only one time, but I don't see the result of my calculations being added to the tag twice. Doesn't make sense because I would think that the initial evaluation of the currentValue would be all that was needed, but, here we are. 🤔 ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [September 20, 2023, 11:20pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/10 "2023-09-20T23:20:56Z")
> [@pjgonzales](#): > > I can't tell if its > [@pturmel](#): > > Use a logger. Yes, really. `system.util.getLogger(...)`. ---
**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:** [September 20, 2023, 11:25pm UTC](https://forum.inductiveautomation.com/t/double-trigger-on-tag-value-changed-script/79418/11 "2023-09-20T23:25:32Z")
Look closer at your logic / indentation: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/a/da7faf45425c59816500cf71a4141750b3e3c24e.png)