# How can I toggle a Boolean tag when String changes in the Text Field? **URL:** \ **Category:** Ignition\ **Tags:** ignition81, scripting, vision\ **Created:** [August 2, 2023, 8:46pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315 "2023-08-02T20:46:17Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Shirshak\_Chhetri](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@Shirshak\_Chhetri](https://forum.inductiveautomation.com/u/Shirshak_Chhetri)\ **Post date:** [August 2, 2023, 8:46pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/1 "2023-08-02T20:46:17Z")
Hello, I have been trying to get the value of a Boolean Tag to turn on momentarily when String changes in the text field. I have tried out couple scripts on property change handler of the Text Field but none seem to work. Any help is appreciated. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/2/6298f7d00af17e8897d9a98056621b519b555520.png) ---
**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:** [August 2, 2023, 8:50pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/2 "2023-08-02T20:50:32Z")
What is the real problem you are trying to solve? There may be a much better way to achieve your goal. What action is the boolean tag going to trigger? ---
**Author:** ![Shirshak\_Chhetri](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@Shirshak\_Chhetri](https://forum.inductiveautomation.com/u/Shirshak_Chhetri)\ **Post date:** [August 2, 2023, 8:54pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/3 "2023-08-02T20:54:25Z")
What I'm trying to achieve is, everytime the string in Partname updates, I want to energize a reset tag on the PLC. ---
**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:** [August 2, 2023, 8:55pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/4 "2023-08-02T20:55:29Z")
Why not do that in the PLC? It would be much more reliable. ---
**Author:** ![Shirshak\_Chhetri](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@Shirshak\_Chhetri](https://forum.inductiveautomation.com/u/Shirshak_Chhetri)\ **Post date:** [August 2, 2023, 9:01pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/5 "2023-08-02T21:01:55Z")
It would be more reliable to get it done in PLC but I don't have much PLC experience. How would I look for changes in the String's tag through PLC. ---
**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:** [August 2, 2023, 9:08pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/6 "2023-08-02T21:08:02Z")
That depends on where the string is coming from. Does the PLC have the string value in memory? If it does then, - Compare `PartName` with `prevPartName`. - If changed then turn on `Reset OneShot` in the PLC. Use that to reset whatever has to be reset. - Set `prevPartName = PartName`. ---
**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\ **Post date:** [August 2, 2023, 9:12pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/7 "2023-08-02T21:12:47Z")
What type of PLC? ---
**Author:** ![Shirshak\_Chhetri](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@Shirshak\_Chhetri](https://forum.inductiveautomation.com/u/Shirshak_Chhetri)\ **Post date:** [August 2, 2023, 9:15pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/8 "2023-08-02T21:15:09Z")
Its an AB compactLogix 1769. ---
**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\ **Post date:** [August 2, 2023, 9:23pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/9 "2023-08-02T21:23:18Z")
Assuming that you have a String type tag that is storing this information then you would just compare for a change in the value using a NEQ and then MOV the current value into a LastValue Tag. Copy and paste this into a rung, and replace the tag names with the relevant references. ```auto NEQ LastPartName PartName BST OTE PartNameChange NXB MOV PartName LastPartName BND ``` This will turn on the PartNameChange Bit for 1 scan, if you need it on longer than that you can utilize an OTL, OTU, and TON to reset the bit after some delay. ---
**Author:** ![Shirshak\_Chhetri](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@Shirshak\_Chhetri](https://forum.inductiveautomation.com/u/Shirshak_Chhetri)\ **Post date:** [August 2, 2023, 9:41pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/10 "2023-08-02T21:41:00Z")
OK, but what are the BST, NXB and BND operations? ---
**Author:** ![jlandwerlen](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@jlandwerlen](https://forum.inductiveautomation.com/u/jlandwerlen)\ **Post date:** [August 2, 2023, 9:45pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/11 "2023-08-02T21:45:10Z")
Here is an example where the name change will set the bool. You can reset the bool with a button. It just uses a property change script. If you want the bool to auto reset after a period of time, that is possible, but I didn't show that in the attached example. To test make sure to put in preview mode. [PartName.zip](https://forum.inductiveautomation.com/uploads/short-url/nAVZBV4ZtZOZjBw0cLflzFGVk7C.zip) (2.8 KB) ---
**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:** [August 2, 2023, 9:46pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/12 "2023-08-02T21:46:18Z")
> [@Shirshak\_Chhetri](#): > > OK, but what are the BST, NXB and BND operations? They're the branch instructions and will be explained in the Logix5000 / Studio5000 help files. When you paste in the code it will be converted to ladder logic and the meaning should be obvious. ---
**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\ **Post date:** [August 2, 2023, 9:54pm UTC](https://forum.inductiveautomation.com/t/how-can-i-toggle-a-boolean-tag-when-string-changes-in-the-text-field/77315/13 "2023-08-02T21:54:41Z")
As @transistor said, those create a branch on the rung. BST = Branch Start (instructions following this will be on the top rung) NXB = Next Branch (Add one at the start of each new branch) BND = Branch End It will look basically like this: ```plaintext |--NEQ------------------------+------------OTE----+--| | |------------MOV----| ```