# Modicon Modbus addressing **URL:** \ **Category:** Ignition\ **Created:** [July 18, 2018, 11:21am UTC](https://forum.inductiveautomation.com/t/modicon-modbus-addressing/18875 "2018-07-18T11:21:18Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![klbmcgregor](https://avatars.discourse-cdn.com/v4/letter/k/3be4f8/32.png) [@klbmcgregor](https://forum.inductiveautomation.com/u/klbmcgregor)\ **Post date:** [July 18, 2018, 11:21am UTC](https://forum.inductiveautomation.com/t/modicon-modbus-addressing/18875/1 "2018-07-18T11:21:18Z")
I’m working with a PLC programmer who is using a Modicon M241. I’ve never used the Modbus driver. I have connected to it with the Modbus TCP driver, but all I’m having trouble getting to the correct addresses. The addresses that I have been given by the programmer are %MW60200, %MW62200… and more addresses with this format. I’ve found some documentation that give me the some Modbus equivalents to %MW addresses, but not ones with this high of number. Does anyone know how I can translate these to Modbus addresses? Or where I can tell the PLC programmer to look for them? Thank you. ---
**Author:** ![brandon1](https://avatars.discourse-cdn.com/v4/letter/b/ea666f/32.png) [@brandon1](https://forum.inductiveautomation.com/u/brandon1)\ **Post date:** [July 18, 2018, 12:06pm UTC](https://forum.inductiveautomation.com/t/modicon-modbus-addressing/18875/2 "2018-07-18T12:06:07Z")
So are you saying that doing [Your Device Name]HR60200 on the item path of your Ignition tag is not working? This should be a standard address in Modbus. ---
**Author:** ![klbmcgregor](https://avatars.discourse-cdn.com/v4/letter/k/3be4f8/32.png) [@klbmcgregor](https://forum.inductiveautomation.com/u/klbmcgregor)\ **Post date:** [July 18, 2018, 12:09pm UTC](https://forum.inductiveautomation.com/t/modicon-modbus-addressing/18875/3 "2018-07-18T12:09:09Z")
No… I’m saying that I don’t know if HR60200 = %MW60200. I’ll have the programmer put some data in there and see if it’s working. Thank you for the reply. ---
**Author:** ![brandon1](https://avatars.discourse-cdn.com/v4/letter/b/ea666f/32.png) [@brandon1](https://forum.inductiveautomation.com/u/brandon1)\ **Post date:** [July 18, 2018, 12:12pm UTC](https://forum.inductiveautomation.com/t/modicon-modbus-addressing/18875/4 "2018-07-18T12:12:04Z")
Oh I see. If you look under the advanced tab in your device setup, there is a checkbox that says “One Based Addressing”. If you don’t seem to see the correct data, try changing that option. I have found that sometimes addresses are skewed by one in Modbus and changing this paramater will fix that skew. ([https://docs.inductiveautomation.com/display/DOC79/Connecting+to+Modbus+Device](https://docs.inductiveautomation.com/display/DOC79/Connecting+to+Modbus+Device)) ---
**Author:** ![klbmcgregor](https://avatars.discourse-cdn.com/v4/letter/k/3be4f8/32.png) [@klbmcgregor](https://forum.inductiveautomation.com/u/klbmcgregor)\ **Post date:** [July 18, 2018, 1:27pm UTC](https://forum.inductiveautomation.com/t/modicon-modbus-addressing/18875/5 "2018-07-18T13:27:40Z")
Great. I’m seeing most of the correct data, the addresses are skewed by one though. Thanks a lot! One that has incorrect data in it is a string that is address %MW60200. If I set the ignition tag to HR60200 (or HR60201 to adjust for skew), is that only looking at a single 16 bit word? If it is, how do I address it in ignition to read all of the string data? ---
**Author:** ![Brian](https://avatars.discourse-cdn.com/v4/letter/b/97f17d/32.png) [@Brian](https://forum.inductiveautomation.com/u/Brian)\ **Post date:** [July 18, 2018, 1:43pm UTC](https://forum.inductiveautomation.com/t/modicon-modbus-addressing/18875/6 "2018-07-18T13:43:18Z")
Have a look at the string setup info, about halfway down on this page: [https://docs.inductiveautomation.com/display/DOC79/Modbus+Addressing](https://docs.inductiveautomation.com/display/DOC79/Modbus+Addressing)