Rockwell-automation Logix5000 Controllers Structured Text Programming Manuel d'utilisateur télécharger pdf (Page 19)

Publication 1756-PM007D-EN-P - November 2012 19

Program Structured Text Chapter 1

Use Bitwise Operators

Bitwise operators manipulate the bits within a value based on two values.

For example:

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.

For Use this operator Optimal Data Type

Bitwise AND &, AND DINT

Bitwise OR OR DINT

Bitwise exclusive OR XOR DINT

Bitwise complement NOT DINT

Use this format Example

For this situation You’d write

value1 operator value2 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.”

result1 := input1 AND input2;

Order Operation

1. ( )

2. function (…)

3. **

4. - (negate)

5. NOT

6. *, /, MOD

7. +, - (subtract)

8. <, <=, >, >=

9. =, <>

10. &, AND

11. XOR

12. OR

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Rockwell-automation Logix5000 Controllers Structured Text Programming Manuel d'utilisateur Page 19