# One of the RTDE Register Already In Use – Unable to Perform Simple Move Command on UR CB Series Robot

**URL:** <https://forum.universal-robots.com/t/one-of-the-rtde-register-already-in-use-unable-to-perform-simple-move-command-on-ur-cb-series-robot/38142>\
**Category:** Technical Questions\
**Created:** [January 21, 2025, 12:23pm UTC](https://forum.universal-robots.com/t/one-of-the-rtde-register-already-in-use-unable-to-perform-simple-move-command-on-ur-cb-series-robot/38142 "2025-01-21T12:23:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sam\_11](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@Sam\_11](https://forum.universal-robots.com/u/Sam_11)\
**Post date:** [January 21, 2025, 12:23pm UTC](https://forum.universal-robots.com/t/one-of-the-rtde-register-already-in-use-unable-to-perform-simple-move-command-on-ur-cb-series-robot/38142/1 "2025-01-21T12:23:29Z")

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Hi all,  
I’m currently facing an issue with my UR10 CB series robot when trying to perform a simple movement command using the RTDE control interface. I’ve been getting the error message:

_“One of the RTDE input registers are already in use! Currently, you must disable the EtherNet/IP adapter, PROFINET, or any MODBUS unit configured on the robot.”_

I’ve followed these steps to resolve the issue, but the error still persists:

1. I have already disabled the EtherNet/IP adapter and other related protocols (PROFINET, MODBUS) as instructed.
2. I’ve rebooted the robot and the PC running the RTDE client.
3. I confirmed there are no active connections using the same port (30004) using `netstat`, and I’ve also restarted the machine to ensure no processes are occupying the register.  
I would greatly appreciate if someone could tell me if i have missed something.  
Thank you!!!