# UDT Not scaling float when passing in parameters

**URL:** <https://forum.inductiveautomation.com/t/udt-not-scaling-float-when-passing-in-parameters/117593>\
**Category:** Ignition\
**Created:** [October 23, 2026, 8:33pm UTC](https://forum.inductiveautomation.com/t/udt-not-scaling-float-when-passing-in-parameters/117593 "2026-10-23T20:33:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![EDoepke](https://avatars.discourse-cdn.com/v4/letter/e/eb9ed0/32.png) [@EDoepke](https://forum.inductiveautomation.com/u/EDoepke)\
**Post date:** [October 23, 2026, 8:33pm UTC](https://forum.inductiveautomation.com/t/udt-not-scaling-float-when-passing-in-parameters/117593/1 "2026-10-23T20:33:56Z")

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I am working on a large project converting 5 Wonderware applications to Ignition. I have created a UDT for analog signals and set up parameters for things like Description, Max\_EU and Max\_Raw values. I have bound these parameters into the scaling information for some Float OPC tags. I set up the initial OPC address as "[{Device}]HR" and just manually overrode that with the actual address (i.e.HR16). I populate each UDT instance parameter accordingly (Max\_EU = 22 & Max\_Raw = 10000). No errors on the tag, but the values for everything are reporting the RawValue, even though I have liner scaling set up. Here are images of the UDT and one of the tags.

 ![UDS Params](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/9/09905b2a0cbcc33110063b47e5661481d7b7b597.png)

 ![Tag Settings](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/5/a515e8f845aaa3bc1e892d7e061cc90f9c7dbb19.png)

If I again manually override the {Max\_EU} binding, without changing anything, it starts scaling. Wondering if anyone has seen this.

One additional issue is regarding coil reads. Have a tag set up with address C1027. Ignition is reporting it as being on. Wonderware reads that register as off. Most Coils are reading correctly, but have a handful reading wrong value. Any thoughts?

Thanks in advance for any suggestions.

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**Author:** ![Nol](https://avatars.discourse-cdn.com/v4/letter/n/8e8cbc/32.png) [@Nol](https://forum.inductiveautomation.com/u/Nol)\
**Post date:** [October 23, 2026, 9:02pm UTC](https://forum.inductiveautomation.com/t/udt-not-scaling-float-when-passing-in-parameters/117593/2 "2026-10-23T21:02:00Z")

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Not sure about the bug but as a first suggestion I'd put your default Max\_EU and Max\_Raw values to something non zero like 100 in your UDT template. Otherwise if they ever don't get set you're basically trying to scale 0-0 to an undefined number.

For the Coil item the C is to read a counter, so maybe check your syntax there.

> **[Siemens Enhanced Driver | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/8.3/ignition-modules/opc-ua/opc-ua-drivers/siemens/siemens-enhanced-driver)**
>
> The AGLink library has been updated to support Siemens S7-1200 G2 PLCs. With this update, the Siemens Enhanced Driver module also now requires a GLIBC version of 2.34 (or newer) on x64 platforms and 2.17 for ARM platforms. This prevents the Siemens...

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<div class="post-metadata">

**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:** [October 23, 2026, 9:59pm UTC](https://forum.inductiveautomation.com/t/udt-not-scaling-float-when-passing-in-parameters/117593/3 "2026-10-23T21:59:30Z")

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> [@Nol](#):
>
> For the Coil item the C is to read a counter, so maybe check your syntax there.

This is modbus, based on the use of `HR` item paths. `C` is for coils in modbus.