Topic: DMD0114
ROUND - Round Real to Nearest Whole Number
This instruction can only be used in the Expression parameter of the Calculate Expression (MATH) instruction.
The Round Real to the Nearest Whole Number (ROUND) instruction will round a Real number to an integer. If the fractional portion is .5 or greater the integer portion will be rounded up to the next whole number. If the fractional portion is less than .5, the integer portion will not be changed. This math function can handle positive and negative input values. This math function always returns a Signed DWord Integer.
Note: Use the F9 key or click the 'three dot box' at the right edge of the parameter field to open the Default Element Selection Tool (the Element Picker or the Element Browser) or use the Down-Arrow key (Auto-Complete) on any parameter field to see a complete list of the memory locations that are valid for that parameter of the instruction.
Result specifies a location to store the result of the calculation. This can be any writable numeric location.
The Expression parameter consists of all the text between the bounding parentheses. Any expression parameter can be a constant value, a bit or numeric memory location, an arithmetic expression, and / or mathematical function or other expressions up to a maximum of 1024 characters. Expressions can be nested, so use of parentheses is recommended to ensure proper evaluation order.
In the example above:
If R0 = 23.6 the value in D0 would be 24
If R0 = 23.4 the value in D0 would be 23
If R0 = -23.4 the value in D0 would be -23
If R0 = -23.6 the value in D0 would be -24
See Also:
FRAC - Fractional Portion of a Real Number
ROUND - Round Real to Nearest Whole Number
TRUNC - Truncate Real to Whole Number
Related Topics:
Rung Example:
