# ACOPOS 1045 - DC Bus and Mains voltage monitoring in Automation Studio

**URL:** <https://community.br-automation.com/t/acopos-1045-dc-bus-and-mains-voltage-monitoring-in-automation-studio/6323>\
**Category:** Mechatronics & Motion\
**Tags:** acopos, automation-studio\
**Created:** [March 21, 2025, 1:11pm UTC](https://community.br-automation.com/t/acopos-1045-dc-bus-and-mains-voltage-monitoring-in-automation-studio/6323 "2025-03-21T13:11:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Kavourdistiri](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@Kavourdistiri](https://community.br-automation.com/u/Kavourdistiri)\
**Post date:** [March 21, 2025, 1:11pm UTC](https://community.br-automation.com/t/acopos-1045-dc-bus-and-mains-voltage-monitoring-in-automation-studio/6323/1 "2025-03-21T13:11:53Z")

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Dear community members,

is it possible to monitor the 3 phase mains voltage as well as the voltage of the DC Bus of the ACOPOS drive in Automation Studio while using the Test page of the Axis?

This could for example be possible by adding the respective parameters in the Watch window but I don’t know if this functionality is supported.

Thank you in advance.

Equipment used:

- Automation Studio 3.0.90
- ACOPOS 8V1045.00-2 Rev. Q0

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**Author:** ![Martin.Schrott](https://avatars.discourse-cdn.com/v4/letter/m/FF8800/32.png) [@Martin.Schrott](https://community.br-automation.com/u/Martin.Schrott)\
**Post date:** [March 21, 2025, 1:36pm UTC](https://community.br-automation.com/t/acopos-1045-dc-bus-and-mains-voltage-monitoring-in-automation-studio/6323/2 "2025-03-21T13:36:25Z")

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Hello Spyros,

in the Test window only values that are available on the PLC can be added to the Watch pane, the DC bus voltage is only available on the drive.  
The 3 phase main voltage value is not available on ACOPOS 8V10xx.xx-x devices only on newer, like ACOPOSmulti power supplys.

In the Test window all readable values on the drive can be read the following way:

1. Enter ParID number (e.g. UDC\_ACT … 298 … actual voltage of the DC bus)
2. Activate read command
3. The value is displayed in the Watch pane  
 ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/2/2a39fd9c824ea6e48baadd5773ab80e3fd2aec95.png)

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**Author:** ![jan.van-de-wielle](https://avatars.discourse-cdn.com/v4/letter/j/FF8800/32.png) [@jan.van-de-wielle](https://community.br-automation.com/u/jan.van-de-wielle)\
**Post date:** [March 21, 2025, 1:42pm UTC](https://community.br-automation.com/t/acopos-1045-dc-bus-and-mains-voltage-monitoring-in-automation-studio/6323/3 "2025-03-21T13:42:25Z")

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You can use FUB MC\_BR\_ReadParID to read PARID 298.  
[AH: ACP10 - read parid](https://help.br-automation.com/#/en/4/libraries%2Facp10_mc%2Falphabetische_ubersicht%2Fmc_br_readparid%2Fmc_br_readparid.html)  
This only reads it once you perform the ‘Execute’ command.

If you’d like to read it cyclically, you’ll need:  
[AH: ACP10 - MC\_BR\_CyclicRead](https://help.br-automation.com/#/en/4/libraries%2Facp10_mc%2Falphabetische_ubersicht%2Fmc_br_cyclicread%2Fmc_br_cyclicread.html)

Where you set ‘enable’ as soon as the drive is initialized and it will give you the PARID value every cycle.

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<div class="post-metadata">

**Author:** ![Kavourdistiri](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@Kavourdistiri](https://community.br-automation.com/u/Kavourdistiri)\
**Post date:** [March 21, 2025, 1:47pm UTC](https://community.br-automation.com/t/acopos-1045-dc-bus-and-mains-voltage-monitoring-in-automation-studio/6323/4 "2025-03-21T13:47:05Z")

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I understand, thank you both for your prompt replies and support!