Converting 2 words (IEEE 754 format) to a real number

vcorona · October 2019

Hi,

So I'm using a Modbus TCP client to read some registers from the server. I need to convert the value of two of this registers (2 words), that are in the IEEE 754 format, to a single real number. There's a library for PCW6 called SYS_PLC that has a function block for this (SYS_IEEE_ToReal). I don't know how to do this on PLCNext Engineer. Any help will be very much appreciated.

Martin [PLCnext Technology Team] · October 2019

Hello,

Please see this thread:

https://www.plcnext-community.net/index.php?option=com_easydiscuss&view=post&id=1272&Itemid=221&lang=en#reply-1343

The basic steps might be:

Copy the two WORD values to the LSW and MSW in a DWORD variable.
Use the TO_REAL function to convert the DWORD to a REAL.

- Martin.

Martin [PLCnext Technology Team] · October 2019

Here's an example, to demonstrate:

vcorona · October 2019

Thank you very much Martin. It works like a charm.

Converting 2 words (IEEE 754 format) to a real number

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