# Ignition - SENTRON PAC3200 - connection via MODBUS TCP

**URL:** <https://forum.inductiveautomation.com/t/ignition-sentron-pac3200-connection-via-modbus-tcp/108040>\
**Category:** Ignition\
**Tags:** opcua, modbus\
**Created:** [July 2, 2025, 11:52am UTC](https://forum.inductiveautomation.com/t/ignition-sentron-pac3200-connection-via-modbus-tcp/108040 "2025-07-02T11:52:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![rafal.samoraj](https://avatars.discourse-cdn.com/v4/letter/r/a6a055/32.png) [@rafal.samoraj](https://forum.inductiveautomation.com/u/rafal.samoraj)\
**Post date:** [July 2, 2025, 11:52am UTC](https://forum.inductiveautomation.com/t/ignition-sentron-pac3200-connection-via-modbus-tcp/108040/1 "2025-07-02T11:52:27Z")

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**Hello,**  
I'm trying to connect to a SIEMENS SENTRON PAC3200 power monitoring device via MODBUS TCP.  
There is a connection between the Ignition gateway and the SENTRON device, but I can't read any registers.  
I suppose the SENTRON is working fine because I can read the registers using the qModMaster software.

I've tried `[SENTRON_184]HRF1` and `[SENTRON_184]HRF2` as the OPC Item Path.

 ![tagDef](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/7/573db3dde92882a2edd4c7e6be27e8dfd7b5f5bc.jpeg)  
 ![qModMaster](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/f/bf856ecdc03671cfe91b5ebd3be657be5158b9de.jpeg)  
 ![connection](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/5/459a8170c2be00e585a48f2e65be94e703ee92be.jpeg)

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [July 2, 2025, 12:50pm UTC](https://forum.inductiveautomation.com/t/ignition-sentron-pac3200-connection-via-modbus-tcp/108040/2 "2025-07-02T12:50:50Z")

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> [@rafal.samoraj](#):
>
> [SENTRON\_184]HRF1

Try OPC Item Paths like `[SENTRON_184]1.HRF1` instead. (set the unit/slave id to 1 instead of the default 0)

If that still doesn't work then get a Wireshark capture and compare what's different between the requests from Ignition and the requests from QModMaster.

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<div class="post-metadata">

**Author:** ![rafal.samoraj](https://avatars.discourse-cdn.com/v4/letter/r/a6a055/32.png) [@rafal.samoraj](https://forum.inductiveautomation.com/u/rafal.samoraj)\
**Post date:** [July 30, 2025, 2:30pm UTC](https://forum.inductiveautomation.com/t/ignition-sentron-pac3200-connection-via-modbus-tcp/108040/3 "2025-07-30T14:30:18Z")

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`[SENTRON_184]1.HRF1` This is the solution. Thanks