# Addressing Scheme of openPLC in node-red

**URL:** <https://discourse.nodered.org/t/addressing-scheme-of-openplc-in-node-red/6595>\
**Category:** General\
**Created:** [9 January 2019 09:13 UTC](https://discourse.nodered.org/t/addressing-scheme-of-openplc-in-node-red/6595 "2019-01-09T09:13:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![noobPLC](https://avatars.discourse-cdn.com/v4/letter/n/b5e925/32.png) [@noobPLC](https://discourse.nodered.org/u/noobPLC)\
**Post date:** [9 January 2019 09:13 UTC](https://discourse.nodered.org/t/addressing-scheme-of-openplc-in-node-red/6595/1 "2019-01-09T09:13:12Z")

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I am trying to write a value 1 to location %Qx0.0 using a modbus-write node to openPLC running in RPI. and read the Location %QX0.1 using modbus-read node . can someone please help me with the Address i need to fill while configuring the nodes.

Thanks in Advance.

with warm regards.

I have Attached the screen shots of the node configurations.

 ![Screenshot%20from%202019-01-09%2004-10-18](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/4/458a2ec18eb4fff085d0ec76491201105b89b914.png)

 ![Screenshot%20from%202019-01-09%2004-10-24](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/1/131f3441aba10a5f798ceefe03d74b8846d63b82.png)

 ![Screenshot%20from%202019-01-09%2004-10-33](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/d/df3580683db10fa3145127766a8c80237f6ad490.png)

 ![Screenshot%20from%202019-01-09%2004-11-25](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/6/61637b59ce7d133679c566c7b803f7721d99dd47.png)

 ![Screenshot%20from%202019-01-09%2004-11-33](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/b/bbd1ce351ce44ff6d19db28c0fc8c359610063bc.png)

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [9 January 2019 09:31 UTC](https://discourse.nodered.org/t/addressing-scheme-of-openplc-in-node-red/6595/2 "2019-01-09T09:31:39Z")

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Do you know what address you would use if you were accessing OpenPLC from something other than node-RED? If not then you need someone who knows about OpenPLC rather than someone who knows about node-RED, in which case this may not be the best place to ask.

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**Author:** ![noobPLC](https://avatars.discourse-cdn.com/v4/letter/n/b5e925/32.png) [@noobPLC](https://discourse.nodered.org/u/noobPLC)\
**Post date:** [9 January 2019 09:35 UTC](https://discourse.nodered.org/t/addressing-scheme-of-openplc-in-node-red/6595/3 "2019-01-09T09:35:57Z")

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Thanks for the help