# Pipe link appears different in session vs preview **URL:** \ **Category:** Ignition\ **Tags:** perspective\ **Created:** [July 13, 2026, 6:26pm UTC](https://forum.inductiveautomation.com/t/pipe-link-appears-different-in-session-vs-preview/116378 "2026-07-13T18:26:49Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Carleton\_Brown](https://avatars.discourse-cdn.com/v4/letter/c/c0e974/32.png) [@Carleton\_Brown](https://forum.inductiveautomation.com/u/Carleton_Brown)\ **Post date:** [July 13, 2026, 6:26pm UTC](https://forum.inductiveautomation.com/t/pipe-link-appears-different-in-session-vs-preview/116378/1 "2026-07-13T18:26:49Z")
I have a pipes configuration in a view of my perspective application where all of the links are configured the same with the exception they each look at a different bit of a status work for visibility. If the bit is true the link visibility is set to true, if the bit is false the link visibility is bond to a tag that is alternating off and on, blinking. This works great in preview mode but if I launch a perspective session certain links disappear when they should be blinking. The links all appear fine when the condition is true. In the screenshots below link 5 works properly while link 4 does not. Any idea why? ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/8/e/8e9dd1d51384d400791f54eb8eb706e0e66f479b.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/0/603734c0c52041999c10f172bcc27fd87150f1bd.png) ## ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/0/000f059e3b948dd119f7966d7c999ed572673c32.png) ## ---
**Author:** ![vtran](https://avatars.discourse-cdn.com/v4/letter/v/779978/32.png) [@vtran](https://forum.inductiveautomation.com/u/vtran)\ **Post date:** [July 13, 2026, 7:29pm UTC](https://forum.inductiveautomation.com/t/pipe-link-appears-different-in-session-vs-preview/116378/2 "2026-07-13T19:29:17Z")
The way that you set up right now, your `visible` field is only updated when your tag changes, and it will grab a snapshot of the `view.custom.Blink_Plus` at that time. A couple things that you can do: - Move the tag binding to another custom property, something like `view.custom.linkState` so you don't read the same tag multiple times - Use Expression Structure binding that look at both `view.custom.linkState` and `view.custom.Blink_Plus` Something like `"linkState": {view.custom.linkState},` `"blink": {view.custom.Blink_Plus}` - Then transform it to `if(getBit({value}["linkState"], 4), true, value["blink"])` I'm not near a designer right now, so might need to check the syntax. Also, haven't played with pipes recently, but might want to check if you can give the pipe segment a class instead of using the `visible` property. ---
**Author:** ![Carleton\_Brown](https://avatars.discourse-cdn.com/v4/letter/c/c0e974/32.png) [@Carleton\_Brown](https://forum.inductiveautomation.com/u/Carleton_Brown)\ **Post date:** [July 16, 2026, 3:18pm UTC](https://forum.inductiveautomation.com/t/pipe-link-appears-different-in-session-vs-preview/116378/3 "2026-07-16T15:18:50Z")
The video above shows the Session on the left and the preview of the right. I would really like to know why the two are different and why what I'm doing isn't working. As far as reading a tag multiple times, is there a limit to the number of times tags can be read from? ---
**Author:** ![Carleton\_Brown](https://avatars.discourse-cdn.com/v4/letter/c/c0e974/32.png) [@Carleton\_Brown](https://forum.inductiveautomation.com/u/Carleton_Brown)\ **Post date:** [July 16, 2026, 3:52pm UTC](https://forum.inductiveautomation.com/t/pipe-link-appears-different-in-session-vs-preview/116378/4 "2026-07-16T15:52:15Z")
I can put the PLC in program mode and manipulate the link status bits. There seems to be a correlation between the links that are vertically aligned. I can't determine the relationship, but if I change the state of one link, another link will become visible. Usually the one above or below it. Is there some kind of vertical relationship between the links? ---
**Author:** ![Carleton\_Brown](https://avatars.discourse-cdn.com/v4/letter/c/c0e974/32.png) [@Carleton\_Brown](https://forum.inductiveautomation.com/u/Carleton_Brown)\ **Post date:** [August 6, 2026, 6:06pm UTC](https://forum.inductiveautomation.com/t/pipe-link-appears-different-in-session-vs-preview/116378/5 "2026-08-06T18:06:53Z")
Hello vtran. I tried your recommendations and got the same results. I've also tried a different browser, MS Edge, with the same results. Any ideas? ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/8/b/8b8e200516de162ba79c4738e11d7d169ef5669a.png)