Siemens FP_32BITS_3DP Data Type - Function Modbus and DataType


According to the Siemens documentation on “MODBUS Register Data Types”, the data type “FP_32BITS_3DP” is:

What would be the designator in the Modbus Addresses for the OPC Item Path? I think it’s IRF.

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

Can you help me, please?

Best Regards.

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.

Thank you.