# Contrib S7 error

**URL:** <https://discourse.nodered.org/t/contrib-s7-error/97347>\
**Category:** General\
**Created:** [31 May 2025 00:32 UTC](https://discourse.nodered.org/t/contrib-s7-error/97347 "2025-05-31T00:32:32Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![CobyCoffee](https://avatars.discourse-cdn.com/v4/letter/c/7ea924/32.png) [@CobyCoffee](https://discourse.nodered.org/u/CobyCoffee)\
**Post date:** [31 May 2025 00:32 UTC](https://discourse.nodered.org/t/contrib-s7-error/97347/1 "2025-05-31T00:32:32Z")

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Hi! I'm working on a project using contrib s7, I have configured the PLC IP adress and Rack Slot and the memory adresses of some variables I am using in TIA Portal, everything was working fine for a while but I was working on it today and suddenly I get this error now: Error: PLC error [0x8104]: This service is not implemented on the module or a frame error was reported

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/f/2fe4d38d410a0b8d41665fd2aed2c724918718df.png)

The variable which is a boolean only shows as online and no true or false value as it was showing before, has anyone had a similar problem who can help me?

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**Author:** ![TotallyInformation](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/totallyinformation/32/31_2.png) [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Post date:** [31 May 2025 10:26 UTC](https://discourse.nodered.org/t/contrib-s7-error/97347/2 "2025-05-31T10:26:35Z")

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It generally helps to give the full package name so that it can be looked up. There are 2 pages of s7 related nodes on the flows site.

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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:** [31 May 2025 15:08 UTC](https://discourse.nodered.org/t/contrib-s7-error/97347/3 "2025-05-31T15:08:06Z")

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Hi @CobyCoffee - welcome to the forum 🙂

> [@CobyCoffee](#):
>
> Error: PLC error [0x8104]: This service is not implemented on the module or a frame error was reported

Searching this ☝on google reveals a fair few hits including:

- [Contrib-s7 error when adding variables](https://discourse.nodered.org/t/contrib-s7-error-when-adding-variables/36480)
- [https://lists.apache.org/thread/qk3ln5xp68r12q3rv76p949s4f6gk2sm](https://lists.apache.org/thread/qk3ln5xp68r12q3rv76p949s4f6gk2sm)
- [https://youtu.be/rTUs-\_EiZ3A?t=40](https://youtu.be/rTUs-_EiZ3A?t=40)
- and many more

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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:** [29 August 2025 15:08 UTC](https://discourse.nodered.org/t/contrib-s7-error/97347/4 "2025-08-29T15:08:13Z")

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