# Modbus OPC-UA with GE 90-30

**URL:** <https://forum.inductiveautomation.com/t/modbus-opc-ua-with-ge-90-30/1856>\
**Category:** Ignition\
**Created:** [May 19, 2010, 5:07pm UTC](https://forum.inductiveautomation.com/t/modbus-opc-ua-with-ge-90-30/1856 "2010-05-19T17:07:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bhastie](https://avatars.discourse-cdn.com/v4/letter/b/d6d6ee/32.png) [@bhastie](https://forum.inductiveautomation.com/u/bhastie)\
**Post date:** [May 19, 2010, 5:07pm UTC](https://forum.inductiveautomation.com/t/modbus-opc-ua-with-ge-90-30/1856/1 "2010-05-19T17:07:40Z")

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I have a couple of GE 90-30 PLCs I need to talk to. They have GE-IC693CMM321 cards in them and I am able to communicate with them. Problem is, I have zero knowledge of the addressing schema for getting GE addresses to Modbus addresses. Need a little nudge in the right direction.

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**Author:** ![bhastie](https://avatars.discourse-cdn.com/v4/letter/b/d6d6ee/32.png) [@bhastie](https://forum.inductiveautomation.com/u/bhastie)\
**Post date:** [May 20, 2010, 4:48pm UTC](https://forum.inductiveautomation.com/t/modbus-opc-ua-with-ge-90-30/1856/2 "2010-05-20T16:48:04Z")

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Problem resolved. I finally found the right guy at GE to get the information I needed. For the CMM321 Communication Module, the Modbus mapping can be found in the Manual GFK1541B, appendix E. This document can be found on the GE website.

[TCPIP\_Enet\_Comm\_GE9030\_Modbus Mapping.pdf](https://us1.discourse-cdn.com/inductiveautomation/original/2X/b/b6aea87d26a2d95e1c1e0f699b4c39b0eb8b75c3.pdf) (29.7 KB)

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**Author:** ![Colby.Clegg](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/colby.clegg/32/3282_2.png) [@Colby.Clegg](https://forum.inductiveautomation.com/u/Colby.Clegg)\
**Post date:** [May 20, 2010, 6:11pm UTC](https://forum.inductiveautomation.com/t/modbus-opc-ua-with-ge-90-30/1856/3 "2010-05-20T18:11:29Z")

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Thanks for posting that. If you translate that into Ignition’s modbus mapping tool, please post the CSV export as well. Our hope is that over time we’ll build up a collection of CSV config files for different devices here on the forum. 😃

Regards,