# Internal Var (Modbus)

**URL:** <https://forum.universal-robots.com/t/internal-var-modbus/24707>\
**Category:** Robot Communication\
**Created:** [October 29, 2022, 7:15pm UTC](https://forum.universal-robots.com/t/internal-var-modbus/24707 "2022-10-29T19:15:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![anon73185020](https://avatars.discourse-cdn.com/v4/letter/a/ecccb3/32.png) [@anon73185020](https://forum.universal-robots.com/u/anon73185020)\
**Post date:** [October 29, 2022, 7:15pm UTC](https://forum.universal-robots.com/t/internal-var-modbus/24707/1 "2022-10-29T19:15:06Z")

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Greetings,  
I’m using a UR3 robot, and i need to use a internal Var when the robot is on standby/stop or some program is running, is that possible to get a internal register by modbus tcp?

Kind regards,

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<div class="post-metadata">

**Author:** ![Elettrotec\_AC14](https://avatars.discourse-cdn.com/v4/letter/e/74df32/32.png) [@Elettrotec\_AC14](https://forum.universal-robots.com/u/Elettrotec_AC14)\
**Post date:** [October 30, 2022, 2:49pm UTC](https://forum.universal-robots.com/t/internal-var-modbus/24707/2 "2022-10-30T14:49:52Z")

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Hi,  
with profinet is possibile, i think also with modbus.  
see this page:

> [@Protective Stop - Enable robot from PLC](https://forum.universal-robots.com/t/protective-stop-enable-robot-from-plc/23914):
>
> Hello, Is there a way to : Inform the PLC when a protective stop appers ? Enable the robot directly from the PLC after a protective stop ? I use a profinet communication with a robot. Best regards,

and this:  
[https://www.universal-robots.com/articles/ur/interface-communication/profinet-how-to-guide-cb3/](https://www.universal-robots.com/articles/ur/interface-communication/profinet-how-to-guide-cb3/)

you can check if there is an article in this page:  
[Articles | Support site | Universal Robots](https://www.universal-robots.com/articles/)?