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 returns a Signed DWord Integer.

 

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 to the right

 

  • 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:

 

Related Topics:

 

Rung Example: