converting IEEE-754 64-bit to integer

I have a problem convering Modbus register, 64-bit IEEE-754, stored in 4 registers. 32-bit float stored in 2 registers is ok.

In control builder i use a function block named MBRead and reading 4 registers starting with 11051.

Example

When i read the instrument, Eaton Power Xpert, a see a energy value 1069930 kWh.

This value is stored in 4 registers.

using my MBRead gets this result

Rd(1)=768

Rd(2)=0

Rd(3)=16

Rd(4)=21355

My question is how do i convert these to 1069930?

/anders

anders Rank: 533

Asked 4 years ago

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Answers

Hi, check this app.

Govindaraj AKS expert

Rank: 11

Answered 4 years ago

Its a built in system function in AC800M called Words_to_real

Edit, misread - if 32 bit real no's are OK, then you'll need to write your own conversion for 64 bit

Rob Lyon Rank: 2

Answered 4 years ago