# Tag value in engHigh using relative tag path **URL:** \ **Category:** General Discussion\ **Created:** [January 20, 2023, 11:40pm UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872 "2023-01-20T23:40:57Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![bwirth](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@bwirth](https://forum.inductiveautomation.com/u/bwirth)\ **Post date:** [January 20, 2023, 11:40pm UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/1 "2023-01-20T23:40:57Z")
Can't figure out why this is giving me fits, so I figured I'd hit up the experts! Trying to input the value from a tag using a relative tag path in engHigh.. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/4/24c0b338ec3347012790e35f344d76e0b84cdf0c.png) ---
**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:** [January 20, 2023, 11:52pm UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/2 "2023-01-20T23:52:53Z")
Tag properties are not expression tags. The binding options available are limited, and do not include other tag values. If you must, use a tag change event on the source tag to **write** to the tag **property** you wish to keep in sync. Keep in mind that this is _configuration_ of the tag on the receiving end. ---
**Author:** ![bwirth](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@bwirth](https://forum.inductiveautomation.com/u/bwirth)\ **Post date:** [January 21, 2023, 12:08am UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/3 "2023-01-21T00:08:05Z")
Gotcha. I saw the "PathToTag" option in the popup and assumed different. Such is life. Thanks! ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/d/5d7c4b4ee6f782b0034bc359f57064595c49d9f4.png) ---
**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:** [January 21, 2023, 12:18am UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/4 "2023-01-21T00:18:19Z")
> [@bwirth](#): > > saw the "PathToTag" option Yeah, that's not to a different tag, but a string of the path to the tag containing the property you are constructing the binding for. ---
**Author:** ![bwirth](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@bwirth](https://forum.inductiveautomation.com/u/bwirth)\ **Post date:** [January 21, 2023, 12:37am UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/5 "2023-01-21T00:37:48Z")
Ah, gotcha! Thanks again. ---
**Author:** ![bwirth](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@bwirth](https://forum.inductiveautomation.com/u/bwirth)\ **Post date:** [January 22, 2023, 5:36pm UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/6 "2023-01-22T17:36:45Z")
Ok I dealt with this in a roundabout way. I created a parameter for TankHeight and used it in the EngHigh for the tags. Then I put a change script on the \_Configuration/TankHeight tag that did a tag write to the parameter which in turn updates the other tags. I have the tags set as readonly so I couldn't update them directly. This appears to be working. Thanks again for the direction! ---
**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:** [January 22, 2023, 6:28pm UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/7 "2023-01-22T18:28:51Z")
Is there a particular reason you need an actual tag for this, instead of just configuring via the UDT parameter? ---
**Author:** ![bwirth](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@bwirth](https://forum.inductiveautomation.com/u/bwirth)\ **Post date:** [January 22, 2023, 10:53pm UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/8 "2023-01-22T22:53:55Z")
We transmit these as standard tags via mqtt to a central site (not as udts). I want to give the ability to change these from there. (Although I do know they will require a rebirth for the central site to see the engMax updates...) ---
**Author:** ![jmcneely](https://avatars.discourse-cdn.com/v4/letter/j/6de8d8/32.png) [@jmcneely](https://forum.inductiveautomation.com/u/jmcneely)\ **Post date:** [March 5, 2026, 12:16am UTC](https://forum.inductiveautomation.com/t/tag-value-in-enghigh-using-relative-tag-path/68872/9 "2026-03-05T00:16:59Z")
Let’s say you have an analog input UDT. You always want to historize the PV tag. PV scales are always different.. So, a default deadband type of percentage and default deadband value of 0.5 would be great. In order to use percentage it needs the EngLow and EngHigh to be set. If you could bind these to your PV\_Min and PV\_Max opc tags then it’s all done automatically… But since they can’t be bound you have to set them every time.. pretty, I mean very inconvenient.