# \#abb-controller
**URL:** https://tech-community.robotics.abb.com/tag/abb-controller/1050.md
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## [RAPID error 40634 – unknown signal seArcAvOnFlag in ArcStart routine](https://tech-community.robotics.abb.com/t/rapid-error-40634-unknown-signal-searcavonflag-in-arcstart-routine/12016)
**Author:** [@Anoop](https://tech-community.robotics.abb.com/u/Anoop)\
**Replies:** 0\
**Last updated:** [August 28, 2025, 7:52pm UTC](https://tech-community.robotics.abb.com/t/rapid-error-40634-unknown-signal-searcavonflag-in-arcstart-routine/12016 "2025-08-28T19:52:26Z")
We made a program in robot studio and transferred the rapid program to real robot and got this error. How can it be resolved?
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## [Vision system](https://tech-community.robotics.abb.com/t/vision-system/10678)
**Author:** [@atef123](https://tech-community.robotics.abb.com/u/atef123)\
**Replies:** 1\
**Last updated:** [April 6, 2022, 9:21am UTC](https://tech-community.robotics.abb.com/t/vision-system/10678 "2022-04-06T09:21:22Z")
Hi Everyone I want to know if all the camera types are compatible with the abb robot I can use any vision system with ABB Robot? Thank you
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## [EGM timing synchronization with external vision system](https://tech-community.robotics.abb.com/t/egm-timing-synchronization-with-external-vision-system/10256)
**Author:** [@john\_LRW](https://tech-community.robotics.abb.com/u/john_LRW)\
**Replies:** 4\
**Last updated:** [June 17, 2021, 4:36pm UTC](https://tech-community.robotics.abb.com/t/egm-timing-synchronization-with-external-vision-system/10256 "2021-06-17T16:36:47Z")
does EGM or robot controller have an output signal to the external device, which can be used to synchronize the external device and EGM? if not, is there a time protocol for the synchronization purpose? We’d like to have…