NITestStandSystemandArchitectureOverview

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Execution Object Structure

Execution Object

Contains information TestStand needs to run a sequence,

its steps, and any subsequences it calls. You can suspend,

interactively debug, resume, terminate, or abort executions.

Thread Object

Represents an independent path of control flow.

Report Object

Contains the report text. The process model updates the Report

object, and the sequence editor or user interface displays it.

Call Stack

Lists the chain of active sequences waiting for nested

subsequences to complete. The first item in the call stack is the

most-nested sequence invocation.

Root SequenceContext Object

Represents the execution of the least-nested sequence

invocation that contains a list of steps and calls to other

sequences.

SequenceContext Object

Represents the execution of a sequence that another sequence

called.

Current Step

Represents the executing step of the currently executing

sequence in the call stack.

Architecture Overview

TestStand Sequence Editor

TestStand development environment for creating, modifying,

executing, and debugging sequences.

Custom User Interfaces

Customizable applications that, depending on mode,

edit, execute, and debug test sequences on a test

station. User interfaces are available in several

different programming languages and include full

source code, which allows you to modify them to meet

specific needs.

Process Models

Define the operations that occur for all test sequences,

such as identifying the UUT, notifying the operator of

pass/fail status, generating a test report, and logging

results. TestStand includes three fully customizable

process models: Sequential, Parallel, and Batch.

User Interface Controls

A powerful set of ActiveX controls and support APIs

for creating custom user interfaces.

TestStand Engine

A set of DLLs that provides an extensive ActiveX

Automation API for controlling and interacting with

TestStand. The TestStand Sequence Editor, User

Interface Controls, and user interfaces use this API.

Sequence File Executions

Created by the TestStand Engine when you execute a

test sequence using the sequence editor or a user

interface.

Adapters

Allow TestStand to call code modules in a variety of

different formats and languages. Adapters also allow

TestStand to integrate with various ADEs to streamline

test code generation and debugging.

Code Modules

Program modules, such as LabVIEW VIs (

.vi) or

Windows Dynamic Link Libraries (.dll), that contain

one or more functions that perform a specific test or

action. TestStand adapters call code modules.

Built-In Step Types

Define the standard behaviors for common testing

operations. Some step types use adapters to call code

modules that return data to TestStand for further

analysis. Other step types perform standard operations,

such as calling an executable or displaying dialog

boxes.

User-Defined Step Types

Define a set of custom step properties and default

behaviors for each step of that custom type. You can

also define data types.

Templates

Create custom sequences, steps, and variables to use

as templates to build sequence files.

OVERVIEW CARD

NI TestStand

System and Architecture

NI TestStand is flexible test management software that offers the following major features:

• Out-of-the-box configuration and components

provide a ready-to-run, full-featured test

management environment.

• Numerous methods for modifying, configuring,

and adding new components, which provide

extensibility so you can create a test executive

that meets specific requirements without altering

the core TestStand Engine. You can upgrade to

newer versions of TestStand without losing your

customizations.

• Sophisticated sequencing, execution, and

debugging capabilities, and a powerful sequence

editor that is separate from the user interfaces.

• User interface controls for creating custom user

interfaces and sequence editors.

• You can also create your own user interface in

any programming language that can host ActiveX

controls or control ActiveX automation servers.

• Example user interfaces with source code for

National Instruments LabVIEW, National

Instruments LabWindows

™

/CVI

™

, Microsoft

Visual Basic .NET, C#, and C++ (MFC).

• An open language interface that provides

support for many application development

environments (ADEs). You can create code

modules in a variety of ADEs and call pre-

existing modules or executables.

• A comprehensive application programming

interface for building multithreaded test systems

and other sophisticated test applications.

• Integration with third-party source code control

packages.

• Deployment tools to aid in transferring a test

system from development to production.

TestStand

Sequence Editor

Code Modules

Results

Results Results Results

Results Results Results Results

Custom

User Interfaces

User Interface (UI)

Controls

Application Programming Interface (API)

TestStand Engine

Sequence File

Executions

User-Defined Step Types

Sequence File Executions

No Model

Test

Socket 0

Execution

UUT

Test

Socket 1

Execution

UUT

Test

Socket

Execution

UUT

Process Model Result Processing

Schema Definitions Database LoggerReport Generator

ADO/ODBC

Thread Object 0

Thread

Object

Sequence

File

Globals

Steps

Main Step

Group

Steps

Cleanup Step

Group

Parameters

Sequences

Local

Variables

Adapters

.VI

.DLL, .OBJ, .LIB, .C

.DLL

.DLL, .EXE

.PRG

.SEQ

LabVIEW Adapter

LabWindows/CVI Adapter

C/C++ DLL Adapter

.NET Adapter

ActiveX/COM Adapter

HTBasic Adapter

Sequence Adapter

Types

Sequence File

Parallel Process Model

Batch Process Model

Sequential

Process

Model

Process Model Sequence File Execution

Test

Socket

Execution

Test

Socket 1

Execution

Test

Socket 0

Execution

Oracle

. . .

SQL

Server

Report

Object

Execution Object

Call Stack

Root

SequenceContext

Object 0

SequenceContext

Object 1

SequenceContext

Object

Step Object 0

Step Object

. . .

Current Step

Microsoft

Access

Process

Models

. . .

XML

HTML

ASCII-

Text

. . .

Sequence File Execution Flow

Sequence File Executions

You can execute a sequence directly, or you can execute a

sequence file through a process model Execution entry point,

such as Test UUTs and Single Pass.

Process Model Sequence File Execution

When you start an execution through a process model

Execution entry point, the process model defines how to test

the UUTs. The Sequential model tests one UUT at a time. The

Parallel model tests multiple independent test sockets at the

same time. The Batch model tests a batch of UUTs using

dependent test sockets.

Process Model Result Processing

The TestStand Engine collects the results of each step that

executes into a result list. Process models use the result list

to generate reports and log data to databases.

Unit Under Test (UUT)

Device or component that you are testing.

Test Socket Execution

For each test socket, or fixture, in the system, the Parallel

and Batch models launch a separate test socket execution

that controls the testing of UUTs in that test socket.

Report Generator

The report generator traverses test results to create reports

in XML, HTML, and ASCII-text formats. You can fully

customize the reports.

Schema Definitions

Schema definitions define SQL statements, table definitions,

and TestStand expressions that define how to log results to a

database. You can fully customize the schemas.

Database Logger

The database logger traverses test results and exports data

into database tables using schema definitions.

Sequence File Structure

Sequence File

Contains any number of sequences, a set of data types and

step types the sequence file uses, and any global variables

that sequences in the sequence file share.

Sequences

Contain groups of steps, local variables, and parameters

used for passing data between steps and subsequences.

Types

Sequence files contain definitions of all data types and

step types that its sequences use. Variables and properties

in a sequence are instances of data types. Steps in a

sequence are instances of step types.

Sequence File Globals

Store data you want to access from any sequence or step

within the sequence file in which you define the sequence

file global variable.

Setup, Main, Cleanup Step Groups

TestStand executes the steps in the Setup step group first,

the Main step group next, and the Cleanup step group last.

By default, a sequence moves to the Cleanup step group

when a step generates an error in the Setup or Main step

group.

Local Variables

Store data relevant to the execution of the sequence.

You can access local variables from within steps and code

modules defined in a sequence.

Parameters

Use parameters to exchange data between calling and

called sequences.

Steps

Perform built-in operations or call code modules. A step is an

instance of a step type, which defines a set of step

properties and default behaviors for each step.

373457B-01 Apr07

. . . . . .

. . .

National Instruments, NI, ni.com, NI TestStand, and LabVIEW are trademarks of National Instruments

Corporation. Refer to the

section on ni.com/legal for more information about

National Instruments trademarks. Other product and company names mentioned herein are trademarks

or trade names of their respective companies. For patents covering National Instruments products,

refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or

ni.com/patents.

Steps

Setup Step

Group

Templates

Flow Control

Sequence Call

Statement

Label

Message Popup

Call Executable

Property Loader

FTP Files

Synchronization Steps

Database Steps

IVI-C Steps

LabVIEW Utility

Pass/Fail Test

Numeric Limit Test

Multiple Numeric Limit Test

String Value Test

Action

Built-In Step Types

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