# Communication for Mitsubishi PLC Q Series by using MC Protocol Nodes

**URL:** <https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628>\
**Category:** Industrial\
**Created:** [10 November 2025 08:10 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628 "2025-11-10T08:10:32Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![mamirulazuan](https://avatars.discourse-cdn.com/v4/letter/m/bc8723/32.png) [@mamirulazuan](https://discourse.nodered.org/u/mamirulazuan)\
**Post date:** [10 November 2025 08:10 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/1 "2025-11-10T08:10:32Z")

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I would like to read from Mitsubishi PLC Q Series by using MC Protocol nodes. However, connection error for the MC Protocol nodes. Anyone got similar issue and know how to resolve?

Ethernet type : Built-in (Q03UDVCPU)  
PLC IP Address : 192.168.3.39

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/b/2bed07ad2d2e27ff22f90f1758fd21dfed06c76e.png)  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/a/6a05b6e58598d3e8f5f78c9dd10076ac2e19a884.png)  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/5/951f9ba2b81ee976885bf4e6cf9c2af6f1868abc.png)

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [10 November 2025 09:13 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/2 "2025-11-10T09:13:33Z")

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On Q series, for reasons I have long forgotten, you need to use `UDP` -\> `passive` -\> `procedure exist` and enter port numbers.

Alternatively, just connect to the Auto Open UDP port 5000 (no PLC config required)

Settings on the Node-RED MC Config node would be something like:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/7/27d8e59df29a993c0878598e1b5f69a95a31be66.png)

Depending on the PLC, you might need to use `3E` (but `4E` is better, faster, safer, use that if it works)

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**Author:** ![mamirulazuan](https://avatars.discourse-cdn.com/v4/letter/m/bc8723/32.png) [@mamirulazuan](https://discourse.nodered.org/u/mamirulazuan)\
**Post date:** [10 November 2025 11:58 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/3 "2025-11-10T11:58:05Z")

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Already try but still not working. An error stated as the picture below.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/3/736b392cb62e91e1fcae9f8c36b5a2b2e718469e.png)

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/d/3/d3ee1c54f7b9df9d87d6626d3939a96108527ed3.png)  
Are there any potential issue with the nodes?

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**Author:** ![GogoVega](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gogovega/32/71313_2.png) [@GogoVega](https://discourse.nodered.org/u/GogoVega)\
**Post date:** [10 November 2025 12:09 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/4 "2025-11-10T12:09:22Z")

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The `util.log()` API has been removed in Node23 or 24.

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**Author:** ![mamirulazuan](https://avatars.discourse-cdn.com/v4/letter/m/bc8723/32.png) [@mamirulazuan](https://discourse.nodered.org/u/mamirulazuan)\
**Post date:** [11 November 2025 05:03 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/5 "2025-11-11T05:03:00Z")

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What should i do?  
Install an older version?

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**Author:** ![GogoVega](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gogovega/32/71313_2.png) [@GogoVega](https://discourse.nodered.org/u/GogoVega)\
**Post date:** [11 November 2025 09:24 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/6 "2025-11-11T09:24:55Z")

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Yes, or ask the author of the node to support Node24.

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [11 November 2025 17:09 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/7 "2025-11-11T17:09:01Z")

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> [@mamirulazuan](#):
>
> What should i do?  
> Install an older version

Install Node 22 or Node 20 for the time being

> [@GogoVega](#):
>
> ask the author of the node to support Node24

I am in the process or updating the node but it wont be ready for few weeks due to vacation.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [10 January 2026 17:09 UTC](https://discourse.nodered.org/t/communication-for-mitsubishi-plc-q-series-by-using-mc-protocol-nodes/99628/8 "2026-01-10T17:09:56Z")

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