ROUND Function

ROUND(a)

ROUND(a, n)

Rounds a to n decimal places.

Parameters

a(REAL)

The input value.

n (DINT)

The number of decimal places to round a to. If n is omitted, it is assumed to be 0, and a will be rounded to the nearest integer. n can be between -6 and 6. Negative values specify decimal places to the left of the decimal. Positive values specify decimal places to the right of the decimal.

Return Value

Returns a REAL.

Remarks

0.5 rounds up to 1.0.

Rounding -0.5 differs between the RMCs:

The RMC75E and RMC150E will round -0.5 to -1.0.
The RMC75S and RMC75P will round -0.5 to 0.0.

If n is outside of the range -6 to 6, the task will fault. An error will be logged in the Event Log and the user program running on the task will stop.

Examples

ROUND(0.5) returns 1.0

ROUND(123456,-3) returns 123000

ROUND(0.9876,2) returns 0.99