Signal change rate limiter#

This block allows to limit the changing rate (derivative) of the input function and the value of the output function does not change faster than the signal changing rates specified in the properties.

The derivative is specified by the formula (1):

(1)#\[ rate=\frac{u\left(t\right)-y\left(t-1\right)}{∆t} \]

When the derivative of the input function is within the specified rate limits: the output signal will be equal to the input one.

If the rate of signal change does not match the limits, the outputsignal will be determined according to the formula (2):

(2)#\[\begin{split} y\left(t\right)=∆t\cdot\ Min_{rate}+y\left(t-1\right)\\ y\left(t\right)=∆t\cdot\ Max_{rate}+y\left(t-1\right) \end{split}\]

Use the Initial condition of output signal property to set the output value and calculate the rate of change at the start time using the following formula (3):

(3)#\[rate=\frac{u(0)-y(-1)}{\Delta t}\]

Where y(-1) - the output signal value at the start of time.

1. Properties#

Property	Default value	Description	Units of measurement
Falling slew rate	5	-	-
Rising slew rate	10	-	-
Initial condition of output signal	0	-	-

2. Inputs and outputs#

Parameters	Input/Output	Description	Units of measurement	Port type
Signal	Input	-	-	Automation
Signal	Output	-	-	Automation

In order to see the connection capabilities of the block, you need to go to page Description of block ports

3. Code generation#

Important

Block supports C source code generation