A typical variable declaration in TwinCAT goes like this:
VAR Variable : BOOL; END_VAR
But did you know that TwinCAT also supports variable list declaration?
VAR Variable1, Variable2:BOOL; Variable3, Variable4, Variable5:INT; END_VAR
A simple, but little known trick which might save you some space. I was however surprised to learn that the official TwinCAT documentation about declaring variables, doesn’t mention this feature at all..