# Ignition and Modicon Quantum OPC-UA connection **URL:** \ **Category:** Ignition\ **Created:** [October 27, 2011, 6:17pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508 "2011-10-27T18:17:48Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![vadim.kutuzov](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vadim.kutuzov](https://forum.inductiveautomation.com/u/vadim.kutuzov)\ **Post date:** [October 27, 2011, 6:17pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508/1 "2011-10-27T18:17:48Z")
Hi everybody, I was trying to figure out how to connect Ignition and Modicon Quantum PLC and I do not have luck to make it working. 1. Ignition is up and running. 2. Modbus V2 driver is used. The device is enabled and showing Connected status (see attachment Ignition\_01.jpg). 3. The TestTag01 is configured as HR1 to read 400001 register (see attachment Ignition\_02.jpg). 4. The value of the tag is Null, quality is Unknown. Any ideas how to connect Modicon PLC to Ignition. Any help would be appreciated. Thanks. ![](https://us1.discourse-cdn.com/inductiveautomation/original/1X/45887fc7dbdd7c69500dd886a3a3bdd12f779d58.jpg) ![](https://us1.discourse-cdn.com/inductiveautomation/original/1X/9010c32afe6f7f98f886a43da792665ab9dfab1c.jpg) ---
**Author:** ![Travis.Cox](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@Travis.Cox](https://forum.inductiveautomation.com/u/Travis.Cox)\ **Post date:** [October 27, 2011, 6:22pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508/2 "2011-10-27T18:22:57Z")
You may need to toggle the Use Zero Based Addressing setting when you edit the Modbus device (it is under Advanced settings): ![](https://us1.discourse-cdn.com/inductiveautomation/original/1X/412e755569ccfda635735d6bad055fde1e278209.png) ---
**Author:** ![vadim.kutuzov](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vadim.kutuzov](https://forum.inductiveautomation.com/u/vadim.kutuzov)\ **Post date:** [October 27, 2011, 7:18pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508/3 "2011-10-27T19:18:38Z")
No luck so far. Any other ideas? Thanks. ---
**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:** [October 27, 2011, 7:48pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508/4 "2011-10-27T19:48:54Z")
Are you sure you’ve got the right Slave ID/Unit ID? Is there any messages in the logs? Your screenshots indicate you are successfully connecting, just not able to read HR1 right now. ---
**Author:** ![vadim.kutuzov](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vadim.kutuzov](https://forum.inductiveautomation.com/u/vadim.kutuzov)\ **Post date:** [October 27, 2011, 8:34pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508/5 "2011-10-27T20:34:51Z")
From what I know there is no Slave ID/Unit ID for Quantum PLC to communication over TCP. The log messages are on the screen shot. Thanks. ![](https://us1.discourse-cdn.com/inductiveautomation/original/1X/9559c0988c4951e699bb0bf279744ff3f3382ed9.jpg) ---
**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:** [October 27, 2011, 8:39pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508/6 "2011-10-27T20:39:16Z")
Do you have a user manual or any documentation? What’s going on right now is that the device simply isn’t responding to the read requests. ---
**Author:** ![vadim.kutuzov](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vadim.kutuzov](https://forum.inductiveautomation.com/u/vadim.kutuzov)\ **Post date:** [October 27, 2011, 10:35pm UTC](https://forum.inductiveautomation.com/t/ignition-and-modicon-quantum-opc-ua-connection/3508/7 "2011-10-27T22:35:41Z")
I could not find any good manual for Modicon Modbus TCP. Anyway, I had some issues with the PLC and with the Laptop. After reboot and re-configuring the PLC communication started to work. I could not make it to work for a week or so. Weird… Zero-based addressing enabled allows to read address-to-address value, i.e. HR2 will read 400002 register. With disabled it will read 400003 for HR2. Thanks for the help, guys.