Specifications

sigmadue - IEC 61131-3 Function Block Library

138

5-3-9 MODBUS MASTER CONVERSION TO 8 DWORD VALUES

FB Prototype

MB_MST_RD8_DWORD

Input parameters

Output parameters

Description

The function block can be used to unpack an array of 16 word elements into 8 single

variables as DWORD data type. The first and second elements of the array will be

converted, accordingly to the SWAP selection, into the first output DWORD variable,

the third and fourth elements into the second output variable and so on. This function

block has been designed to work in conjunction with MB_MST_RD_WORD function

block, when values coming from the slave device are formatted as DWORD data type.

Default Values Table

Label Type Description Range

RD_REG

ARRAY [1..16]

OF WORD

Array including each single word to

be unpacked

SWAP BOOL

Swap activation between Low and

High word while converting data [bit]

FALSE = standard,

TRUE = swapped

Label Type Description Range

DWORD_1 DWORD