# Teach-pendant and control box Digital I/O working mechanism **URL:** \ **Category:** Technical Questions\ **Tags:** electrical\ **Created:** [March 13, 2017, 2:49am UTC](https://forum.universal-robots.com/t/teach-pendant-and-control-box-digital-i-o-working-mechanism/599 "2017-03-13T02:49:23Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![anon47499781](https://avatars.discourse-cdn.com/v4/letter/a/ed8c4c/32.png) [@anon47499781](https://forum.universal-robots.com/u/anon47499781)\ **Post date:** [March 13, 2017, 2:49am UTC](https://forum.universal-robots.com/t/teach-pendant-and-control-box-digital-i-o-working-mechanism/599/1 "2017-03-13T02:49:23Z")
hi all Does anyone know if the teach-pandant system crashed Control box controller I/O (Digital I/O) is still working normally?? Thanks ---
**Author:** ![jbm](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/jbm/32/614_2.png) [@jbm](https://forum.universal-robots.com/u/jbm)\ **Post date:** [March 13, 2017, 8:40am UTC](https://forum.universal-robots.com/t/teach-pendant-and-control-box-digital-i-o-working-mechanism/599/2 "2017-03-13T08:40:33Z")
The TP includes an E-stop button, which the system would expect to be present. Hence if you just removed the TP, the robot could not leave E-stop mode. However if you wish to use the robot without a TP attached, please disable the Teach Pendant according to [this guide](https://www.universal-robots.com/how-tos-and-faqs/how-to/ur-how-tos/disable-and-enable-the-teach-pendant-19213/). ---
**Author:** ![anon47499781](https://avatars.discourse-cdn.com/v4/letter/a/ed8c4c/32.png) [@anon47499781](https://forum.universal-robots.com/u/anon47499781)\ **Post date:** [March 14, 2017, 9:32am UTC](https://forum.universal-robots.com/t/teach-pendant-and-control-box-digital-i-o-working-mechanism/599/3 "2017-03-14T09:32:48Z")
Ok thanks.i will try it.