User`s guide

Scope Objects

In this section...

“What Is a Scope Object?” o n page 1 -3

“Scope Object Types” on page 1-4

What Is a Scope Object?

The xPC Target software uses scope objects to represent scopes on the target

PC. Use scope object functions to view and collect signal data.

See “Function Reference” and “Functions” for a reference of the scope

functions.

The xPC T arget software uses scopes and scope objects as an alternative to

using Simulink

scopes and external m ode. A scope can exist as part of a

Simulink model system or outside a model system.

• A scope that is part of a Simulink model sys tem is a scope block. You add

an xPC Target scope block to the model, build an application from that

model, and download that application to the target PC.

• A sco pe that is outside a model is not a scope block. For example, if you

create a scope with the

addscope method,thatscopeisnotpartofa

model system. You add this scope to the model after the model has been

downloaded and initialized.

This difference affects when and how the scope executes to acquire data.

Scope blocks inherit sample times. A scope block in the root model or a normal

subsystem executes at the sample time of its input signals. A scope block in a

conditionall y executed (triggered/en abled) subsystem executes whenever the

containing subsystem executes. Note that in the latter case, the scope might

acquire samples at irregular intervals.

Ascopethatisnotpartofamodelalwaysexecutesatthebasesampletime

of the model. Thus, it might acquire repeated samples. For example, if the

model base sample time is 0.001, and you add to the scope a signal whose

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