1756-PM003H-EN-E, SFC and ST Programming Languages ...

6-10 Program Structured Text
Use bitwise operators
Bitwise operators manipulate the bits within a value based on two values.
For: Use this operator: Optimal Data Type:
bitwise AND &, AND DINT
bitwise OR OR DINT
bitwise exclusive OR XOR DINT
bitwise complement NOT DINT
For example:
Use this format:
value1 operator value2
Example:
For this situation:
If input1, input2, and result1 are DINT tags and your
specification says: “Calculate the bitwise result of
input1 and input2. Store the result in result1.”
You’d write:
result1 := input1 AND
input2;
Determine the order of execution
The operations you write into an expression are performed in a prescribed
order, not necessarily from left to right.
• Operations of equal order are performed from left to right.
• If an expression contains multiple operators or functions, group the
conditions in parenthesis “( )”. This ensures the correct order of
execution and makes it easier to read the expression.
Order:
Operation:
1. ( )
2. function (…)
3. **
4. − (negate)
5. NOT
6. *, /, MOD
7. +, - (subtract)
8. =
9. =,
10. &, AND
11. XOR
12. OR
Publication 1756-PM003H-EN-E (excerpt from 1756-PM001H-EN-P) - August 2005