# Modbus Adressing Help **URL:** \ **Category:** Ignition\ **Created:** [June 20, 2025, 3:38pm UTC](https://forum.inductiveautomation.com/t/modbus-adressing-help/107623 "2025-06-20T15:38:42Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Alex\_Jaffe](https://avatars.discourse-cdn.com/v4/letter/a/ecccb3/32.png) [@Alex\_Jaffe](https://forum.inductiveautomation.com/u/Alex_Jaffe)\ **Post date:** [June 20, 2025, 3:38pm UTC](https://forum.inductiveautomation.com/t/modbus-adressing-help/107623/1 "2025-06-20T15:38:42Z")
I am having trouble grabbing a Modbus address. i only need one point from it located at "Modbus register 30521 (AI1) read from from the MOXA card" the Modbus is set up and connected in OPCUA device connections but I cant seem to find a register where i am able to read a signal. i keep getting errors when i try and make tags. also when i tried to use modbus addressing, the modbus didn't show up in the quick client. I am using ignition edge if that effects anything. Thank you ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [June 20, 2025, 3:46pm UTC](https://forum.inductiveautomation.com/t/modbus-adressing-help/107623/2 "2025-06-20T15:46:18Z")
Try `[devicename]1.IR521` or `[devicename]1.IR520` ---
**Author:** ![Matrix\_Engineering](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/matrix_engineering/32/19781_2.png) [@Matrix\_Engineering](https://forum.inductiveautomation.com/u/Matrix_Engineering)\ **Post date:** [June 20, 2025, 4:09pm UTC](https://forum.inductiveautomation.com/t/modbus-adressing-help/107623/3 "2025-06-20T16:09:45Z")
Are you using a Moxa E1240 or similar? If so see here: [https://youtu.be/RDcFgat6\_sc](https://youtu.be/RDcFgat6_sc) That's 7.9 era but still relevant.