Clock

Display and provide simulation time

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  • Simulink / Sources

  • Clock block

Description

The Clock block outputs the current simulation time at each simulation step. This block is useful for other blocks that need the simulation time.

When you need the current time within a discrete system, use the Digital Clock block.

Ports

Output

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Sample time, specified as the current simulation time at each simulation time step.

Data Types: double

Parameters

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Select this check box to display the simulation time as part of the Clock block icon. When you clear this check box, the simulation time does not appear on the block icon.

Programmatic Use

Block Parameter: DisplayTime
Type: character vector
Values: 'off' | 'on'
Default: 'off'

Specify the interval at which Simulink® updates the Clock icon as a positive integer.

Suppose that the decimation is 1000. For a fixed integration step of 1 millisecond, the Clock icon updates at 1 second, 2 seconds, and so on.

Dependencies

To display the simulation time on the block icon, you must select the Display time check box.

Programmatic Use

Block Parameter: Decimation
Type: character vector
Value: scalar
Default: '10'

Model Examples

Calculate and Display Simulation Step Size using Memory and Clock Blocks

Calculate and Display Simulation Step Size using Memory and Clock Blocks

Use the Memory and Clock blocks to calculate and display the step size in a simulation.

Open Model
Inverted Pendulum with Animation

Inverted Pendulum with Animation

Model an inverted pendulum. The animation is created using MATLAB® Handle Graphics®. The animation block is a masked S-function. For more information, use the context menu to look under the Animation block's mask and open the S-function for editing.

Open Model
Accurate Zero-Crossing Detection

Accurate Zero-Crossing Detection

How zero crossings work in Simulink®. In this model, three shifted sine waves are fed into an absolute value block and saturation block. At exactly t = 5, the output of the switch block changes from the absolute value to the saturation block. Zero crossings in Simulink will automatically detect exactly when the switch block changes its output, and the solver will step to the exact time that the event happens. This can be seen by examining the output in the scope.

Open Model

Block Characteristics

Data Types

double

Direct Feedthrough

no

Multidimensional Signals

no

Variable-Size Signals

no

Zero-Crossing Detection

no

Extended Capabilities

See Also

Topics

Introduced before R2006a

Simulink Documentation

Support