# Siemens FP\_32BITS\_3DP Data Type - Function Modbus and DataType

**URL:** <https://forum.inductiveautomation.com/t/siemens-fp-32bits-3dp-data-type-function-modbus-and-datatype/62711>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [August 5, 2022, 10:08am UTC](https://forum.inductiveautomation.com/t/siemens-fp-32bits-3dp-data-type-function-modbus-and-datatype/62711 "2022-08-05T10:08:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ISEMAREN\_AAG](https://avatars.discourse-cdn.com/v4/letter/i/82dd89/32.png) [@ISEMAREN\_AAG](https://forum.inductiveautomation.com/u/ISEMAREN_AAG)\
**Post date:** [August 5, 2022, 10:08am UTC](https://forum.inductiveautomation.com/t/siemens-fp-32bits-3dp-data-type-function-modbus-and-datatype/62711/1 "2022-08-05T10:08:52Z")

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Hello.

According to the **Siemens** documentation on “ **MODBUS Register Data Types** ”, the data type “ **FP\_32BITS\_3DP** ” is:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/d/3df30e996616a029cc53f303e2d469423fd517e5.png)

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What would be the _ **designator** _ in the Modbus Addresses for the **OPC Item Path**? I think it’s **IRF**.  
[https://docs.inductiveautomation.com/display/DOC81/Modbus+Addressing](https://docs.inductiveautomation.com/display/DOC81/Modbus+Addressing)

What would be the **Data Type** in Ignition? I think it is **Float**.

Can you help me, please?

Best Regards.

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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:** [August 5, 2022, 11:54am UTC](https://forum.inductiveautomation.com/t/siemens-fp-32bits-3dp-data-type-function-modbus-and-datatype/62711/2 "2022-08-05T11:54:44Z")

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It is not float. It is _ **Fixed Point** _ in an integer. Use `IRI1` or `IRUI1`. Then, in the tag configuration, set the tag to **float** and the linear scaling endpoints to shift the decimal. Something like raw 0 → 100000 converts to scaled 0.0 → 100.0.

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<div class="post-metadata">

**Author:** ![ISEMAREN\_AAG](https://avatars.discourse-cdn.com/v4/letter/i/82dd89/32.png) [@ISEMAREN\_AAG](https://forum.inductiveautomation.com/u/ISEMAREN_AAG)\
**Post date:** [August 5, 2022, 12:13pm UTC](https://forum.inductiveautomation.com/t/siemens-fp-32bits-3dp-data-type-function-modbus-and-datatype/62711/3 "2022-08-05T12:13:50Z")

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Thank you.