# Schneider PLC

**URL:** <https://forum.inductiveautomation.com/t/schneider-plc/7053>\
**Category:** Archived Topics\
**Created:** [August 15, 2013, 9:45am UTC](https://forum.inductiveautomation.com/t/schneider-plc/7053 "2013-08-15T09:45:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![adriancampos](https://avatars.discourse-cdn.com/v4/letter/a/b9bd4f/32.png) [@adriancampos](https://forum.inductiveautomation.com/u/adriancampos)\
**Post date:** [August 15, 2013, 9:45am UTC](https://forum.inductiveautomation.com/t/schneider-plc/7053/1 "2013-08-15T09:45:49Z")

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Hi.

I am using a Schneider PLC simulator with a simple program and I will like to create a HMI using Ignition designer.

I can connect the PLC via the OPC-UA server, but I am not able to define the variables to read them on the HMI.

Can anyone help me?

Thanks.

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<div class="post-metadata">

**Author:** ![pphillips](https://avatars.discourse-cdn.com/v4/letter/p/da6949/32.png) [@pphillips](https://forum.inductiveautomation.com/u/pphillips)\
**Post date:** [August 15, 2013, 2:23pm UTC](https://forum.inductiveautomation.com/t/schneider-plc/7053/2 "2013-08-15T14:23:51Z")

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Search for “Modbus Specific Addressing” in the manual.

Prefixes for each simple type are:  
HR for 4xxxxx registers  
IR for 3xxxxx registers  
C for 0xxxxx coils  
DI for 1xxxxx discrete inputs

Example - For a driver named MyPLC, the OPC Item Path for addressing register 400001 would be:

[MyPLC]HR1

Hope this helps.