Siemens Sinumerik 840D sl Programming Manual page 68

Flexible NC programming
1.4 Comparison and logic operations
Bit-by-bit logic operator
B_AND
B_OR
B_NOT
B_XOR
Note
In arithmetic expressions, the execution order of all the operators can be specified by
parentheses, in order to override the normal priority rules.
Note
Spaces must be left between BOOLEAN operands and operators.
Note
The operator B_NOT only refers to one operand. This is located after the operator.
Examples
Example 1: Relational operators
IF R10>=100 GOTOF DEST
or
R11=R10>=100
IF R11 GOTOF DEST
The result of the R10>=100 comparison is first buffered in R11.
Example 2: Logic operators
IF (R10<50) AND ($AA_IM[X]>=17.5) GOTOF DESTINATION
or
IF NOT R10 GOTOB START
NOT only refers to one operand.
Example 3: Bit-by-bit logic operators
IF $MC_RESET_MODE_MASK B_AND 'B10000' GOTOF
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Significance
Bit-serial AND
Bit-serial OR
Bit-serial negation
Bit-serial exclusive OR
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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