# Read/Write engineering limit for a tag **URL:** \ **Category:** Ignition Early Access\ **Created:** [July 25, 2019, 2:23pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876 "2019-07-25T14:23:29Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![betti.francesco](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/betti.francesco/32/6309_2.png) [@betti.francesco](https://forum.inductiveautomation.com/u/betti.francesco)\ **Post date:** [July 25, 2019, 2:23pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/1 "2019-07-25T14:23:29Z")
Hi all, is there a way to read/write by scripting the engineering limits for a tag? system.tag.getConfiguration doesn’t give those informations, and for the writing part? Maybe i can use system.tag.configure, but how to configure the tag with my customized limits? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [July 25, 2019, 3:35pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/2 "2019-07-25T15:35:07Z")
You can just directly write to the sub property of the tags; if you only need to update a single value, that’s probably the easiest way: `system.tag.writeAsync(["[default]testTag.EngLow"], [50])` ---
**Author:** ![betti.francesco](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/betti.francesco/32/6309_2.png) [@betti.francesco](https://forum.inductiveautomation.com/u/betti.francesco)\ **Post date:** [July 26, 2019, 6:44am UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/3 "2019-07-26T06:44:27Z")
Perfect, many thanks 🙂 I’d like to manipulate even other sub properties, are those sub properties documented? or is there a way to know the sub properties names? ---
**Author:** ![nick.schuetz](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nick.schuetz/32/6160_2.png) [@nick.schuetz](https://forum.inductiveautomation.com/u/nick.schuetz)\ **Post date:** [July 26, 2019, 1:10pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/4 "2019-07-26T13:10:31Z")
The tag property page in the documentation [(here)](https://docs.inductiveautomation.com/display/DOC80/Tag+Properties) should help. ---
**Author:** ![betti.francesco](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/betti.francesco/32/6309_2.png) [@betti.francesco](https://forum.inductiveautomation.com/u/betti.francesco)\ **Post date:** [July 26, 2019, 2:01pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/5 "2019-07-26T14:01:07Z")
Don’t know how I couldn’t find it, thank you! 🙂 ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [July 26, 2019, 3:23pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/6 "2019-07-26T15:23:55Z")
Also, in 8.0.3+ they should just be listed, so you can expand a tag in the tag browser, then right click -\> Copy Path. Works for UDT parameters, too. ---
**Author:** ![betti.francesco](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/betti.francesco/32/6309_2.png) [@betti.francesco](https://forum.inductiveautomation.com/u/betti.francesco)\ **Post date:** [July 27, 2019, 9:16am UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/7 "2019-07-27T09:16:42Z")
Just installed the RC2, that’s great! many thanks for the support 🙂 ---
**Author:** ![ecujak](https://avatars.discourse-cdn.com/v4/letter/e/839c29/32.png) [@ecujak](https://forum.inductiveautomation.com/u/ecujak)\ **Post date:** [November 22, 2019, 5:08pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/8 "2019-11-22T17:08:15Z")
Thank you PGriffeth… ---
**Author:** ![tordvd](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/tordvd/32/11525_2.png) [@tordvd](https://forum.inductiveautomation.com/u/tordvd)\ **Post date:** [November 22, 2019, 6:00pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/9 "2019-11-22T18:00:18Z")
Not the same at all, but do you know why I can write to the engineering properties, but not historyEnabled. Through the mqtt engine via sparkplugB? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [November 25, 2019, 4:38pm UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/10 "2019-11-25T16:38:06Z")
Nope, but it’s going to depend a lot on your Ignition version and your version of the MQTT modules. ---
**Author:** ![nasaini](https://avatars.discourse-cdn.com/v4/letter/n/85f322/32.png) [@nasaini](https://forum.inductiveautomation.com/u/nasaini)\ **Post date:** [September 11, 2020, 5:58am UTC](https://forum.inductiveautomation.com/t/read-write-engineering-limit-for-a-tag/26876/11 "2020-09-11T05:58:50Z")
Hi @paul-griffith @nick.schuetz @nminchin @ We are writing custom javascript code to create a groupid/nodeid/device & we are able to update the value of memory tag under the device. But when we are trying to update the sub-properties of memory tag (EngHigh, EngLow, etc… ) it is not updating value :(. We are trying in below format in Javascript : let msg={}; msg[‘deviceId’]=assetId; msg[‘Current’]={}; msg[‘Current’][‘value’]=90 **//Updating the Memory Tag value** msg[‘Current’][‘engHigh’]=990 **//It is not updating the Engineering High Value** Above this code is failing . **This is roadblocker for us. Please suggest some solution how ignition excepts payload from custom javascript**