Rate Limiter

Operator Menu Location: Signal Conditioning

Operator Bitmap:

Functional Description:
The Rate Limiter operator restricts a signal's rate of change to a specified operating band: It prevents a signal from growing faster than the rising rate limit, input . And, it prevents a signal from decreasing in value faster than the fall rate limit, .
In mathematical terms, the rate limiter output is defined by

where y is the output, is the change in the input value, t is the loop sampling time, input is the maximum positive rate of change, and input is the maximum negative rate of change.
If the rate limits will not change over time then inputs and need not be connected. Instead, the rate limits can be defined by the operator properties and .

User-Defined Properties:
Object Name. A string label that identifies the operator
Rise Rate Limit. The maximum positive rate of change in the input signal, . Ignored if input is connected.
Fall Rate Limit. The maximum negative rate of change in the input signal, . Ignored if input is connected.
Display Rise Rate Limit Input. Determines if the input pin is visible in the schema diagram. Design Pad issues a warning upon processing the schema when the pin is visible but not connected. The warning message is not issued when the pin is not visible (when this property is not checked).
Display Fall Rate Limit Input. Determines if the input pin is visible in the schema diagram. Design Pad issues a warning upon processing the schema when the pin is visible but not connected. The warning message is not issued when the pin is not visible (when this property is not checked).

Comments: None.

See Also: Limiter, Delay Element