# Rapid unknown the digital signal of device

**URL:** <https://tech-community.robotics.abb.com/t/rapid-unknown-the-digital-signal-of-device/5666>\
**Category:** RobotStudio\
**Created:** [August 21, 2013, 8:58am UTC](https://tech-community.robotics.abb.com/t/rapid-unknown-the-digital-signal-of-device/5666 "2013-08-21T08:58:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![chengang](https://avatars.discourse-cdn.com/v4/letter/c/e47c2d/32.png) [@chengang](https://tech-community.robotics.abb.com/u/chengang)\
**Post date:** [August 21, 2013, 8:58am UTC](https://tech-community.robotics.abb.com/t/rapid-unknown-the-digital-signal-of-device/5666/1 "2013-08-21T08:58:53Z")

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Hi，  
I created several digital signal for the Mechanism in Station，but when I debug the Rapid program，error “reference to unknown entire data PosA”，PosA is a digital signal I created for my Mechanism.  
Thanks.