# Micrologix 1400 OPC Tag Path

**URL:** <https://forum.inductiveautomation.com/t/micrologix-1400-opc-tag-path/82393>\
**Category:** Ignition\
**Tags:** ignition81, perspective\
**Created:** [November 27, 2023, 6:36pm UTC](https://forum.inductiveautomation.com/t/micrologix-1400-opc-tag-path/82393 "2023-11-27T18:36:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![rlees](https://avatars.discourse-cdn.com/v4/letter/r/a3d4f5/32.png) [@rlees](https://forum.inductiveautomation.com/u/rlees)\
**Post date:** [November 27, 2023, 6:36pm UTC](https://forum.inductiveautomation.com/t/micrologix-1400-opc-tag-path/82393/1 "2023-11-27T18:36:53Z")

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I am preparing an Ignition (V8.1) Perspective project for an existing system. I have many OPC tags that I am trying to specify an OPC Item Path for. The paths will be to specific portions of Data Files within several Micrologix 1400s. The issue that I am running into is that without connecting to the PLCs themselves, the Data Files are not added to my OPCUA Devices configuration. Therefore, I have no way to select the Item path... I can type the path in manually, but this creates an "Error\_Configutation" for each tag within the project. **Is there a way for me to add the Data Files to my OPCUA Device Connections without ever connecting to the PLCs?** For reasons that I will not get into, these PLCs are not accessible to be until the time of install.

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [November 27, 2023, 6:41pm UTC](https://forum.inductiveautomation.com/t/micrologix-1400-opc-tag-path/82393/2 "2023-11-27T18:41:20Z")

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If you know what the device's item path will be, then you can confidently add them to your Ignition tags, and ignore the configuration error. (It will go away when connected.)

At this time, there is no support for "preloading" OPC browser with item paths. If you wish to suppress the error during development, consider converting to memory tags. (The tag config for OPC will remain in place, for when you convert back.)

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**Author:** ![rlees](https://avatars.discourse-cdn.com/v4/letter/r/a3d4f5/32.png) [@rlees](https://forum.inductiveautomation.com/u/rlees)\
**Post date:** [November 27, 2023, 6:58pm UTC](https://forum.inductiveautomation.com/t/micrologix-1400-opc-tag-path/82393/3 "2023-11-27T18:58:35Z")

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Thank you for the quick response! This will serve as an acceptable solution for me now. My main concern was being able to change tag values offline for testing purposes. Suppressing the error notification will allow me to do this while also getting the work of setting the paths out of the way.

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**Author:** ![jlandwerlen](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@jlandwerlen](https://forum.inductiveautomation.com/u/jlandwerlen)\
**Post date:** [November 27, 2023, 7:16pm UTC](https://forum.inductiveautomation.com/t/micrologix-1400-opc-tag-path/82393/4 "2023-11-27T19:16:21Z")

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@nminchin has a handy way to bulk convert opc to/from memory.

> [@Reading PLC tags offline](https://forum.inductiveautomation.com/t/reading-plc-tags-offline/40596/3):
>
> If I don’t have a PLC but I have the project, most of our tags are within UDTs which are already developed, so these are fairly easy to create manually or using a tool that takes in a list of instance names and parameters and creates the udt instances for me. Without a PLC, in v8, you can convert tags between opc and memory without any information being removed (this wasn’t in the case in v7). I use this script, just copied into the script console, to convert tag json copied into the clipboard…