Convert Byte into Array

2020-02-27T13:55:21.270000Z

Just a typo mistake. Edited my previous post.

BIT datatype is a bit length in memory, while BOOL is 8 bit length (a Byte).

Convert Byte into Array

2020-02-27T13:55:20.998000Z

Thanks dFx. I learned something new but there was one issue I ran into when testing this. When you specified BOOL for Bit3 it causes it to not work. All data types appear to have to be BIT in order for the union to work.

Convert Byte into Array

2020-02-27T13:55:20.226000Z

So if you want to name it, declarations :

TYPE MyPumpCmd_STRUCT :
STRUCT
   Bit0 : BIT;
   Bit1 : BIT;
   Bit2 : BIT;
   Bit3 : BIT;
   Bit4 : BIT;
   Bit5_Run : BIT;
   Bit6_Reverse : BIT;
   Bit7_QuickStop : BIT;
END_STRUCT
END_TYPE

TYPE MyPumpCmd_UNION :
UNION
   aByte : BYTE;
   aStruct : MyPumpCmd_STRUCT;
END_UNION
END_TYPE

VAR_GLOBAL
   MyPumpCmd : MyPumpCmd_UNION;
END_VAR

Then, usage :

MyPumpCmd.Bit5_Run := TRUE
%OB5 := MyPumpCmd.aByte

EDIT 2019/01/21: Correct "Bit3 : BOOL;" to "Bit3 : BIT;"

Convert Byte into Array

2020-02-27T13:55:19.953000Z

A union would be nice but believe this doesn't work because of what Le_Baloo said. Been a while since I have tested it though.

What if you just use the UNPACK function. Input would be your byte and the output could tie each bit to your array.
https://help.codesys.com/webapp/unpack;product=codesys;version=3.5.11.0

Or you could do it by hand.

    BoolArray[0] := Byte.0;
    BoolArray[1] := Byte.1;
    BoolArray[2] := Byte.2;
    BoolArray[3] := Byte.3;
    BoolArray[4] := Byte.4;
    BoolArray[5] := Byte.5;
    BoolArray[6] := Byte.6;
    BoolArray[7] := Byte.7;

Convert Byte into Array

2020-02-27T13:55:19.656000Z

Originally created by: ph0010421

I don't think that will work.
You can't make an array of BIT, and a BOOL occupies 8 bits, so it won't align.

There's probably an OSCAT block, but I can never find anything I want in OSCAT

I'd just:

Bit0 := (MyByte AND 16#1) <> 0;
Bit1 := (MyByte AND 16#2) <> 0;
Bit2 := (MyByte AND 16#4) <> 0;

Convert Byte into Array

2020-02-27T13:55:19.455000Z

Byte into an bit array ? Then declare a union datatype with Byte and your bits (named into a DUT or in array)

Convert Byte into Array

2020-02-27T13:55:18.797000Z

Originally created by: Le_Baloo

Hello all,

Have you got any ideas of how i can convert byte into an array in order to read and access to the datas ?

Thanks for your help

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