# ShuttleID vs. Index **URL:** \ **Category:** Mechatronics & Motion\ **Tags:** acopos-trak\ **Created:** [June 18, 2026, 4:07pm UTC](https://community.br-automation.com/t/shuttleid-vs-index/11646 "2026-06-18T16:07:47Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![beani](https://avatars.discourse-cdn.com/v4/letter/b/FF8800/32.png) [@beani](https://community.br-automation.com/u/beani)\ **Post date:** [June 18, 2026, 4:07pm UTC](https://community.br-automation.com/t/shuttleid-vs-index/11646/1 "2026-06-18T16:07:47Z")
Hi Community, Is the ShuttleID required for selecting a shuttle using MC\_BR\_AsmGetShuttle\_AcpTrak the same as the Index variable that comes out of McAcpTrakShuttleMonData? They seem to match up pretty well in simulation, but the difference in names and no direct tie to the variables in the Help has me questioning whether they will match on a real machine. ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/2/2d00c8e8dfd7908620a13a83c53934251bad2a86.png) ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/6/634917963432fe8568ac2e178148d74c855754c8.png) ---
**Author:** ![Stefan](https://avatars.discourse-cdn.com/v4/letter/s/FF8800/32.png) [@Stefan](https://community.br-automation.com/u/Stefan)\ **Post date:** [June 19, 2026, 6:18am UTC](https://community.br-automation.com/t/shuttleid-vs-index/11646/3 "2026-06-19T06:18:58Z")
Hej Isaac, I can confirm that the Index in McAcpTrakAssemblyMonData **equals** the [Shuttle ID](https://help.br-automation.com/#/en/6/motion%2Fmapp_motion%2Fmapp_trak%2Fconcept%2Fuser_id.html). Thanks for the hint, we will clarify this in the AS help for future versions. /Stefan ---
**Author:** ![beani](https://avatars.discourse-cdn.com/v4/letter/b/FF8800/32.png) [@beani](https://community.br-automation.com/u/beani)\ **Post date:** [June 19, 2026, 1:07pm UTC](https://community.br-automation.com/t/shuttleid-vs-index/11646/4 "2026-06-19T13:07:00Z")
Thank you for confirming Stefan!