# Ethernet/IP Host Device OPC Address

**URL:** <https://forum.inductiveautomation.com/t/ethernet-ip-host-device-opc-address/89563>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [April 26, 2024, 10:11pm UTC](https://forum.inductiveautomation.com/t/ethernet-ip-host-device-opc-address/89563 "2024-04-26T22:11:23Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\
**Post date:** [April 26, 2024, 10:11pm UTC](https://forum.inductiveautomation.com/t/ethernet-ip-host-device-opc-address/89563/1 "2024-04-26T22:11:23Z")

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I'm using @pturmel 's Ethernet/IP v2 module to make a host simulation device from a L5X file.

In the PLC I have a tag UDT that has another UDT inside. The path to the tag in the `PLC is Bin_1.Level.Input`.

However, I'm not seeing that in the tag browser after adding the L5X. The OPC addresses that I'm seeing use an underscore instead of a period for anything that's not the root-level UDT (the last period).

So, instead of the expected `Bin_1.Level.Input` I have `Bin_1_Level.Input`.

Is this the expected behavior? Is this behavior different from the AB Logix Driver?

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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:** [April 26, 2024, 10:15pm UTC](https://forum.inductiveautomation.com/t/ethernet-ip-host-device-opc-address/89563/2 "2024-04-26T22:15:03Z")

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Send me the L5X, please. Sounds like a bug. I recently reworked L5X imports to fix other bugs, might have made a new regression.

(The only intended replacement of special characters is to clean up I/O tag names at the outer level.)

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<div class="post-metadata">

**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\
**Post date:** [April 26, 2024, 10:16pm UTC](https://forum.inductiveautomation.com/t/ethernet-ip-host-device-opc-address/89563/3 "2024-04-26T22:16:01Z")

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PM sent (using 2.1.13 (b240541805))

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<div class="post-metadata">

**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\
**Post date:** [April 26, 2024, 10:35pm UTC](https://forum.inductiveautomation.com/t/ethernet-ip-host-device-opc-address/89563/4 "2024-04-26T22:35:46Z")

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Source protection was on. My fault.