Bytes Swapping

[islam_said]

Hi,

I am looking for a Function can Swap Bytes of INT or DINT

AB => BA

or
ABCD => DCBA

Is there a function that can do this except for SWAP_ARINT, SWAP_ARWORD, as these are using Arrays

Thanks

[AdrianCiobanu · Accepted solution]

Here are some function from OSCAT libraries that you can adapt for what you need.

FUNCTION SWAP_BYTE : WORD

VAR_INPUT

                IN : WORD;

END_VAR

SWAP_BYTE := ROL(in,8);

FUNCTION SWAP_BYTE2 : DWORD

VAR_INPUT

                IN : DWORD;

END_VAR

SWAP_BYTE2 := (ROR(in,8) AND 16#FF00FF00) OR (ROL(in,8) AND 16#00FF00FF);

[Bastian_Schmitz]

Which PLC did you use, if the PLC support ST the example from Adrian should work fine.