Relay (Using Simulink)

Switch output between two constants.

Library

Nonlinear

Description

The Relay block allows the output to switch between two specified values. When the relay is on, it remains on until the input drops below the value of the Switch off point parameter. When the relay is off, it remains off until the input exceeds the value of the Switch on point parameter. The block accepts one input and generates one output.

The Switch on point value must be greater than or equal to the Switch off point. Specifying a Switch on point value greater than the Switch off point value models hysteresis, whereas specifying equal values models a switch with a threshold at that value.

Data Type Support

A Relay block accepts and outputs real signals of type double.

Parameters and Dialog Box

Switch on point: The on threshold for the relay. The default is eps.
Switch off point: The off threshold for the relay. The default is eps.
Output when on: The output when the relay is on. The default is 1.
Output when off: The output when the relay is off. The default is 0.

Characteristics

Direct Feedthrough
Yes

Sample Time
Inherited from driving block

Scalar Expansion
Yes

Dimensionalized
Yes

Zero Crossing
Yes, to detect switch on and switch off points

Direct Feedthrough	Yes
Sample Time	Inherited from driving block
Scalar Expansion	Yes
Dimensionalized	Yes
Zero Crossing	Yes, to detect switch on and switch off points

Relational Operator Repeating Sequence