RAMP_INT

Bibliothek: Util

The function block RAMP_INT smoothes the given input signal IN by limiting its rate of change and then outputs the resulting value in Out. The parameters ASCEND and DESCEND, together with the parameter TIMEBASE and the call frequency of the function block, determine the smoothing behaviour.

Attention

For the calculations within the function block, CODESYS uses the data type INTEGER! So also the change in value, given in the output signal, is an integer value. If this behaviour does not meet your requirements, please instead use the function block RAMP_REAL. RAMP_INT is a speed-optimized variant or RAMP_REAL.

See also

• The library UTIL.Library\ \
• RAMP_REAL

Input

Name	Data type	Description
IN	INT	(Discrete) value of the input signal
ASCEND	INT	Limitation of acceleration: Maximum ascent per time base Example: ASCEND := 25 and TIMEBASE := T#1s => Maximum ascent of 25 increments per second
DESCEND	INT	Limitation of deceleration: Maximum descent per time base (DESCEND > 0) Example: DESCEND := 20 uandnd TIMEBASE := T#500ms => Maximum ascent of 20 increments in 500 milliseconds
TIMEBASE	TIME	Time base, to which the limitations ASCEND and DESCEND refer. Example: t#1s If TIMEBASE = t#0s, then the time base equals the task cycle time. In this case the limitation refers to a task cycle. Usually this corresponds exactly to one call of the function block RAMP_INT. Note: If the time base TIMEBASE is smaller than the task, this will lead to a violation of the sampling theorem and might result in a loss of information in the output signal.
RESET	BOOL	Reset of the function block TRUE: The internal calculations are stopped and the function block gets reinitialized. The last output value OUT is maintained and will be used for the new calculation after a restart of the function block. FALSE: The smoothed input signal is given in OUT.

Ausgang

Name	Data type	Description
OUT	INT	(Discrete) value of the output signal The value gets stored internally and will be used for the calculation of the ascent and the descent of the input signal.

Attention

The parameters ASCEND, DESCEND and TIMEBASE, in relation to the call frequency of the function block, might be determined in a way that does not match the sampling theorem. This might lead to a loss of information in the output signal.

Example in CFC