# "Error connecting to PLC: \[object Object\]"

**URL:** <https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052>\
**Category:** Industrial\
**Created:** [15 September 2021 10:45 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052 "2021-09-15T10:45:56Z")\
**Posts on this page:** 11\
**Page:** 1

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**Author:** ![Aakash](https://avatars.discourse-cdn.com/v4/letter/a/9fc348/32.png) [@Aakash](https://discourse.nodered.org/u/Aakash)\
**Post date:** [15 September 2021 10:45 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/1 "2021-09-15T10:45:56Z")

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Hey Guys,

I am getting this error out of nowhere. "Error connecting to PLC: [object Object]". I am using a plc to send data forward through Http. Reading on previous topic didn't help me as no solution was posted there. I have only enabled the node in the exisiting flow.

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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:** [15 September 2021 11:17 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/2 "2021-09-15T11:17:20Z")

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What node is giving that error? Is it a contrib node?  
Where is the error appearing?

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**Author:** ![Aakash](https://avatars.discourse-cdn.com/v4/letter/a/9fc348/32.png) [@Aakash](https://discourse.nodered.org/u/Aakash)\
**Post date:** [15 September 2021 12:02 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/3 "2021-09-15T12:02:56Z")

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I cant find any node which is giving this error. In the following screenshot, none of the node names match with the one giving an error. And even if I disable the entire flow, this error is being displayed.

 ![Screenshot (192)](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/3/b/3b0f9e1e8bf8f25d8599b6c266ab10534daeb1fc.png)

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [15 September 2021 12:28 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/4 "2021-09-15T12:28:44Z")

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If you use the search feature - ctrl/cmd F then look for the id of the node referenced - ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/5/b558becfdc8b9e4451bd2fb5b8c94c8de57d5614.png)  
It should show which node it is.

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**Author:** ![Aakash](https://avatars.discourse-cdn.com/v4/letter/a/9fc348/32.png) [@Aakash](https://discourse.nodered.org/u/Aakash)\
**Post date:** [15 September 2021 12:31 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/5 "2021-09-15T12:31:32Z")

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![Screenshot (193)](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/6/068a39b91a0b862aa06ca3e8337f98c234a0cc41.png)  
This is what i got in response.

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [15 September 2021 12:50 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/6 "2021-09-15T12:50:13Z")

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Have you tried a full deploy ? do you have some old hidden configuration nodes ?

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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:** [15 September 2021 12:51 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/7 "2021-09-15T12:51:14Z")

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When you deploy watch for the message in the deploy popup saying you have unused config nodes.

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**Author:** ![Aakash](https://avatars.discourse-cdn.com/v4/letter/a/9fc348/32.png) [@Aakash](https://discourse.nodered.org/u/Aakash)\
**Post date:** [15 September 2021 12:52 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/8 "2021-09-15T12:52:29Z")

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Yes i have. Same result. And i have some old nodes, but they are not related to PLC

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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:** [15 September 2021 12:55 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/9 "2021-09-15T12:55:24Z")

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If they are unused then delete them from the configuration nodes selection in the menu dropdown. Then uninstall any contrib nodes you have installed.

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**Author:** ![Aakash](https://avatars.discourse-cdn.com/v4/letter/a/9fc348/32.png) [@Aakash](https://discourse.nodered.org/u/Aakash)\
**Post date:** [15 September 2021 13:13 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/10 "2021-09-15T13:13:44Z")

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Thanks it got solved. Restarted flows after deleting unused S7 nodes.

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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 September 2021 13:13 UTC](https://discourse.nodered.org/t/error-connecting-to-plc-object-object/51052/11 "2021-09-29T13:13:55Z")

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