# Error: PLC error \[0x8104\]

**URL:** <https://discourse.nodered.org/t/error-plc-error-0x8104/74270>\
**Category:** Industrial\
**Created:** [27 January 2023 17:08 UTC](https://discourse.nodered.org/t/error-plc-error-0x8104/74270 "2023-01-27T17:08:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![echucuan](https://avatars.discourse-cdn.com/v4/letter/e/c77e96/32.png) [@echucuan](https://discourse.nodered.org/u/echucuan)\
**Post date:** [27 January 2023 17:08 UTC](https://discourse.nodered.org/t/error-plc-error-0x8104/74270/1 "2023-01-27T17:08:43Z")

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In this web page, [node-red-contrib-s7 (node) - Node-RED](https://flows.nodered.org/node/node-red-contrib-s7), this is wrong, `M3.2` `M3.2` Boolean Bit 2 of byte 3 of memory area, if you write M3.2, appers the next error:  
Error: PLC error [0x8104]: This service is not implemented on the module or a frame error was reported

The correct syntaxis are M,3.2 and the proble is solved

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [28 March 2023 17:09 UTC](https://discourse.nodered.org/t/error-plc-error-0x8104/74270/2 "2023-03-28T17:09:17Z")

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