In principle, you can create a struck (UDT) with an amount of 16 bits. So, you can address symbolically the word (as UDT) and the bits (as UDT intern elements).

Hello, Te easist way is to move the word into MW## and then define M#.# in the symbol table.
Or in SCL map the M#.# toaData block variable.
In SCL you can use the AT Function to change the word into a array of bools or a structure of Bools.
Examples below:

FUNCTION_BLOCK FB1
TITLE = '
//©Block usable internal only
//KNOW_HOW_PROTECT
NAME:Shutdown
FAMILY:
AUTHOR: RST
VERSION:'01.00'

VAR
Inputword :INT ;
BOOLS AT Inputword :"Word"; //Word is a UDT structure of 16 BOOLs called Bit1 .. Bit16

Wordbit1 :BOOL;
Wordbit2 :BOOL;
Wordbit3 :BOOL;

//...Make all 16 bits if you need them

END_VAR
//Begin code and Map input word to bool variables.
WordBit1 :=BOOLS.Bit1;
WordBit2 :=BOOLS.Bit2;
WordBit3 :=BOOLS.Bit3;

END_FUNCTION_BLOCK

This same function block can be used but instead of making a UDT and using the AT function use an "MW" word.

//Begin code and Map input word to bool variables.
MW200:= InputWord;

WordBit1 :=M200.0;
WordBit2 :=M200.1;
WordBit3 :=M200.2;

END_FUNCTION_BLOCK

NOTE: Watch out for byte swapping.

Hope this helps?