Comparison And Logic Operations - Siemens SINUMERIK 840D sl Programming Manual

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Flexible NC programming

1.4 Comparison and logic operations

Comparison and logic operations

Comparison operations can be used , for example, to formulate a jump condition. Complex

expressions can also be compared.

The comparison operations are applicable to variables of type CHAR, INT, REAL and BOOL.

The code value is compared with the CHAR type.

For types STRING, AXIS and FRAME, the following are possible: == and <>, which can be

used for STRING type operations, even in synchronous actions.

The result of comparison operations is always of BOOL type.

Logic operators are used to link truth values.

The logical operations can only be applied to type BOOL variables. However, they can also

be applied to the CHAR, INT and REAL data types via internal type conversion.

For the logic (Boolean) operations, the following applies to theBOOL, CHAR,INT and REAL

● 0 corresponds to: FALSE

● not equal to 0 means: TRUE

Bit logic operators

Logic operations can also be applied to single bits of types CHAR and INT. Type conversion

is automatic.

Relational operator

Significance

not equal to

greater than

greater than or equal to

less than or equal to

Programming Manual, 06/2009, 6FC5398-2BP20-0BA0

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