Rockwell Automation GMLC Reference Manual - Manual (Page 504)

Publication GMLC-5.2 - November 1999
Expression Operators 467
Bitwise NOT
~
Use the tilde to complement all the bits in a binary value. Technically, this
is the 1’s complement of the value. It is particularly useful for inverting
the value of an input or output group used with negative logic devices’.
For example, the following expression complements the defined bits of
the group
Input_Group .
~Input_Group
Specifically, if Input_Group is defined to consist of inputs 2 – 5,
which are currently in the following states, the expression above is
evaluated as 5 (the complement of 1010
2
= 0101
2
= 5
10
):
Input 2 = OFF
Input 3 = ON
Input 4 = OFF
Input 5 = ON
Bitwise AND
&
Use the ampersand to logically AND together the corresponding bits in the
binary representation of the two elements. It is particularly useful for
forcing unwanted bits in an input or output group
OFF . This is also known
as masking.
!
ATTENTION: Do not use the Bitwise NOT operator
on user or system variables.
!
ATTENTION: Do not use the Bitwise AND operator
on user or system Variables.