Topic: DMD0123
Math Less Than or Equal Operator
The Math Less Than or Equal operator ( <= ) will determine if the number or expression on the left side of the operator is less than or equal to the number or expression on the right side of the operator. The result will be a value of 1 if the left side value is Less Than or Equal or a value of 0 if the left side value is NOT Less Than or Equal. The result can be placed in any writable discrete memory location or any writable numeric location.
The numbers and expressions can be any mix of signed integers, unsigned integers, real (floating point) numbers or discrete values. They can be any numeric or discrete memory location or any numeric or discrete structure member.
All discrete and 16-bit integer values are promoted to 32-bit 2's complement signed integer values. If a Real value is included in the equation then all of the values will be promoted to Real values and all calculations will be performed using Real numbers.
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Signed Integers: assume D1 = 1000 and D2 = 1024
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C0 = D1 <= D2 |
C0 = (1000 <= 1024)
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Both values are integer memory locations.
The result is placed in a discrete memory location.
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D0 = D1 <= 251 |
D0 = (1000 <= 251) |
The left side value is an integer memory location, the right side value is an integer constant.
The result is placed in an integer memory location.
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Casting Numeric Values: assume R1 = 2.51, and DLV2000 and DLV2001 as a 32-bit Real = 1234.56
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C0 = (2.51 <= 1234.56) C0 = ON
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One value is a floating point memory location, the other is using the 'Real and DWord' cast operators.
The result is placed in a discrete memory location.
DLV memory locations are 16-bit Unsigned used by external DirectLOGIC devices. In this example a remote DirectLOGIC CPU has written a 32-bit floating point value into two successive DLV memory locations. Using the :RD cast operator will interpret the 32-bit value in DLV2000 and DLV2001 as a REAL number.
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See Also:
Less than or Equal To
Related Topics: