National Instruments SCC-CTR01 Manual de usuario

USER GUIDE AND SPECIFICATIONS

NI SCC-CTR01 Isolated

Counter/Timer I/O Module

The NI SCC-CTR01 is a two input and one output isolation module for

general-purpose counter/timers on DAQ devices. The gate and source

inputs are optically isolated to allow an increased voltage range and protect

against common-mode voltages. The inputs also have reverse and

overvoltage protection. The output channel is isolated and has advanced

short-circuit protection, which allows the circuit to recover automatically

250 ms after a short is removed.

Conventions

The following conventions are used in this guide:

»The »symbol leads you through nested menu items and dialog box options

to a final action. The sequence File»Page Setup»Options directs you to

pull down the File menu, select the Page Setup item, and select Options

from the last dialog box.

This icon denotes a caution, which advises you of precautions to take to

avoid injury, data loss, or a system crash. When this symbol is marked on

the product, refer to the Read Me First: Safety and Radio-Frequency

Interference document, shipped with the product, for precautions to take.

This icon denotes a note, which alerts you to important information.

When symbol is marked on a product, it denotes a warning advising you to

take precautions to avoid electrical shock.

When symbol is marked on a product, it denotes a component that may be

hot. Touching this component may result in bodily injury.

bold Bold text denotes items that you must select in software, such as menu

items and dialog box options. Bold text also denotes parameter names.

NI SCC-CTR01 User Guide and Specifications 2 ni.com

italic Italic text denotes variables, emphasis, a cross-reference, or an introduction

to a key concept. Italic text also denotes text that is a placeholder for a word

or value that you must supply.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.

This font is also used for the proper names of disk drives, paths, directories,

programs, subprograms, subroutines, device names, functions, operations,

variables, filenames, and extensions.

NI SC-2345 NI SC-2345 refers to both the NI SC-2345 connector block and the

NI SC-2345 with configurable connectors.

SCC SCC refers to any SCC Series signal-conditioning module.

What You Need to Get Started

To set up and use the NI SCC-CTR01, you need the following items:

❑NI SC-2345 with one of the following:

–SCC-PWR01

– SCC-PWR02 and the PS01 power supply

– SCC-PWR03 (requires a 7 to 42 VDC power supply, not included)

❑One or more NI SCC-CTR01 modules

❑NI SC-2345/2350 Carrier User Manual, available at ni.com

❑NI SCC-CTR01 Isolated Counter/Timer I/O Module User Guide and

Specifications

❑SCC Quick Start Guide, available at ni.com

❑Read Me First: Safety and Radio-Frequency Interference

❑SC-2345 Quick Reference Label

❑68-pin E/M Series DAQ device with the following:

– Documentation

– 68-pin cable of less than 2 m length

❑1/8 in. flathead screwdriver

❑Numbers 1 and 2 Phillips screwdrivers

©National Instruments Corporation 3 NI SCC-CTR01 User Guide and Specifications

❑Wire insulation strippers

❑NI-DAQmx (current version) for Windows Vista/XP/2000

Note Mac OS is not supported.

Related Documentation

Each application software package and driver includes information about

writing applications for taking measurements and controlling measurement

devices. The following references to documents assume you have

NI-DAQmx 8.7 or later, and where applicable, version 7.1 or later

of the NI application software.

NI-DAQmx for Windows

The DAQ Getting Started Guide describes how to install your NI-DAQmx

for Windows software, your NI-DAQmx-supported DAQ device, and how

to confirm that your device is operating properly. Select Start»All

Programs»National Instruments»NI-DAQ»DAQ Getting Started

Guide.

The NI-DAQ Readme lists which devices are supported by this version of

NI-DAQ. Select Start»All Programs»National Instruments»NI-DAQ»

NI-DAQ Readme.

The NI-DAQmx Help contains general information about measurement

concepts, key NI-DAQmx concepts, and common applications that are

applicable to all programming environments. Select Start»All

Programs»National Instruments»NI-DAQ»NI-DAQmx Help.

Note For information about non-Windows operating system support, refer to

ni.com/info and enter rddqld.

NI-DAQmx for Linux

The DAQ Getting Started Guide describes how to install your

NI-DAQmx-supported DAQ device and confirm that your device is

operating properly.

The NI-DAQ Readme for Linux lists supported devices and includes

software installation instructions, frequently asked questions, and known

issues.

The C Function Reference Help describes functions and attributes.

NI SCC-CTR01 User Guide and Specifications 4 ni.com

The NI-DAQmx for Linux Configuration Guide provides configuration

instructions, templates, and instructions for using test panels.

Note All NI-DAQmx documentation for Linux is installed at /usr/local/natinst/

nidaqmx/docs.

LabVIEW

If you are a new user, use the Getting Started with LabVIEW manual to

familiarize yourself with the LabVIEW graphical programming

environment and the basic LabVIEW features you use to build data

acquisition and instrument control applications. Open the Getting Started

with LabVIEW manual by selecting Start»All Programs»National

Instruments»LabVIEW»LabVIEW Manuals or by navigating to the

labview\manuals directory and opening LV_Getting_Started.pdf.

Use the LabVIEW Help, available by selecting Help»Search the

LabVIEW Help in LabVIEW, to access information about LabVIEW

programming concepts, step-by-step instructions for using LabVIEW, and

reference information about LabVIEW VIs, functions, palettes, menus, and

tools. Refer to the following locations on the Contents tab of the LabVIEW

Help for information about NI-DAQmx:

•Getting Started»Getting Started with DAQ—Includes overview

information and a tutorial to learn how to take an NI-DAQmx

measurement in LabVIEW using the DAQ Assistant.

•VI and Function Reference»Measurement I/O VIs and

Functions—Describes the LabVIEW NI-DAQmx VIs and properties.

•Taking Measurements—Contains the conceptual and how-to

information you need to acquire and analyze measurement data in

LabVIEW, including common measurements, measurement

fundamentals, NI-DAQmx key concepts, and device considerations.

LabWindows/CVI

The Data Acquisition book of the LabWindows/CVI Help contains

measurement concepts for NI-DAQmx. This book also contains Taking an

NI-DAQmx Measurement in LabWindows/CVI, which includes

step-by-step instructions about creating a measurement task using the DAQ

Assistant. In LabWindowsTM/CVITM, select Help»Contents, then select

Using LabWindows/CVI»Data Acquisition.

The NI-DAQmx Library book of the LabWindows/CVI Help contains API

overviews and function reference for NI-DAQmx. Select Library

Reference»NI-DAQmx Library in the LabWindows/CVI Help.

©National Instruments Corporation 5 NI SCC-CTR01 User Guide and Specifications

Measurement Studio

If you program your NI-DAQmx-supported device in Measurement Studio

using Visual C++, Visual C#, or Visual Basic .NET, you can interactively

create channels and tasks by launching the DAQ Assistant from MAX or

from within Visual Studio .NET. You can generate the configuration code

based on your task or channel in Measurement Studio. Refer to the DAQ

Assistant Help for additional information about generating code. You also

can create channels and tasks, and write your own applications in your

ADE using the NI-DAQmx API.

For help with NI-DAQmx methods and properties, refer to the NI-DAQmx

.NET Class Library or the NI-DAQmx Visual C++ Class Library included

in the NI Measurement Studio Help. For general help with programming in

Measurement Studio, refer to the NI Measurement Studio Help, which is

fully integrated with the Microsoft Visual Studio .NET help. To view

this help file in Visual Studio. NET, select Measurement Studio»

NI Measurement Studio Help.

To create an application in Visual C++, Visual C#, or Visual Basic .NET,

follow these general steps:

1. In Visual Studio .NET, select File»New»Project to launch the New

Project dialog box.

2. Find the Measurement Studio folder for the language you want to

create a program in.

3. Choose a project type. You add DAQ tasks as a part of this step.

ANSI C without NI Application Software

The NI-DAQmx Help contains API overviews and general information

about measurement concepts. Select Start»All Programs»National

Instruments»NI-DAQ»NI-DAQmx Help.

The NI-DAQmx C Reference Help describes the NI-DAQmx Library

functions, which you can use with National Instruments data acquisition

devices to develop instrumentation, acquisition, and control applications.

Select Start»All Programs»NationalInstruments»NI-DAQ»

NI-DAQmx C Reference Help.

.NET Languages without NI Application Software

With the Microsoft .NET Framework version 1.1 or later, you can use

NI-DAQmx to create applications using Visual C# and Visual Basic .NET

without Measurement Studio. You need Microsoft Visual Studio

.NET 2003 or Microsoft Visual Studio 2005 for the API documentation to

be installed.

NI SCC-CTR01 User Guide and Specifications 6 ni.com

The installed documentation contains the NI-DAQmx API overview,

measurement tasks and concepts, and function reference. This help is fully

integrated into the Visual Studio .NET documentation. To view the

NI-DAQmx .NET documentation, go to Start»Programs»National

Instruments»NI-DAQ»NI-DAQmx .NET Reference Help. Expand

NI Measurement Studio Help»NI Measurement Studio .NET

Class Library»Reference to view the function reference. Expand

NI Measurement Studio Help»NI Measurement Studio .NET Class

Library»Using the Measurement Studio .NET Class Libraries to view

conceptual topics for using NI-DAQmx with Visual C# and Visual

Basic .NET.

To get to the same help topics from within Visual Studio, go to

Help»Contents. Select Measurement Studio from the Filtered By

drop-down list and follow the previous instructions.

Device Documentation and Specifications

NI-DAQmx includes the Device Document Browser, which contains

online documentation for supported DAQ, SCXI, and switch devices, such

as help files describing device pinouts, features, and operation, and PDF

files of the printed device documents. You can find, view, and/or print the

documents for each device using the Device Document Browser at any

time by inserting the CD. After installing the Device Document Browser,

device documents are accessible from Start»All Programs»National

Instruments»NI-DAQ»Browse Device Documentation.

Note You can download these documents at ni.com/manuals.

Training Courses

If you need more help getting started developing an application with NI

products, NI offers training courses. To enroll in a course or obtain a

detailed course outline, refer to ni.com/training.

Technical Support on the Web

For additional support, refer to ni.com/support or zone.ni.com.

©National Instruments Corporation 7 NI SCC-CTR01 User Guide and Specifications

Installing the Software

Software support for the NI SCC-SCTR01 for Windows Vista/XP/2000 is

provided by NI-DAQmx. The DAQ Getting Started Guide, which you can

download at ni.com/manuals, offers NI-DAQmx users step-by-step

instructions for installing software and hardware, configuring channels and

tasks, and getting started developing an application.

Installing Other Software

If you are using other software, refer to the installation instructions that

accompany your software.

Device-Specific Information

Note For general SCC module installation and signal connection information, and

information about the NI SC-2345 carrier, refer to the SCC Quick Start Guide, available

for download at ni.com/manuals.

Installing the Module

Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting/disconnecting any signal wires.

Note When using the SCC-CTR01, groundthe chassis of the DAQ device.

Plug the NI SCC-CTR01 into either general-purpose counter/timer socket

J19 or J20 on the NI SC-2345. When you configure the NI SC-2345

according to the procedure in the SCC Quick Start Guide, the NI SC-2345

routes the CTR_SRC, CTR_GATE, and CTR_OUT signals through the

module.

NI SCC-CTR01 User Guide and Specifications 8 ni.com

Connecting Signals and Loads to the NI SCC-CTR01

Inputs (Gate and Source)

The inputs on the NI SCC-CTR01 are referenced to either the ground or the

supply of the external device to which they are connected. An optical

isolator transfers the externally connected signals to the internal

GPCTR SRC or GATE. A current limiter protects the optical isolator.

A diode protects against reverse-connected signals. Figure 1 illustrates a

single isolated input.

Figure 1. Single Isolated Input

Inputs are referenced to either the ground or supply of the external device,

depending on whether or not the external device can source the amount of

current required by the NI SCC-CTR01 input circuitry. To guarantee a

digital HIGH, the minimum amount of current required by the

NI SCC-CTR01 inputs is 2.2 mA. The overvoltage and overcurrent

protector does not allow the amount of current flowing through the input

circuitry to exceed 10 mA.

NI SCC-CTR01

Optical

Isolator

Overvoltage

and Overcurrent

Protection

Reverse

Voltage Blocker

SRC or

GATE –

SRC or

GATE +

DAQ

Device

©National Instruments Corporation 9 NI SCC-CTR01 User Guide and Specifications

Connecting the NI SCC-CTR01

The following sections describe how to connect the NI SCC-CTR01 as

referenced to ground and as referenced to the supply.

Connecting the NI SCC-CTR01 as Referenced to

Ground

Connect the external device to the SRC or GATE + pin, and connect the

device ground to the SRC or GATE – pin, as shown in Figure 2.

Figure 2. Referenced to Ground

NI SCC-CTR01

Device

Vss or GND

SRC or

GATE –

SRC or

GATE +

Vdd

NI SCC-CTR01 User Guide and Specifications 10 ni.com

Connecting the NI SCC-CTR01 as Referenced to the

Supply

Connect the Vdd on the external device to the NI SCC-CTR01 SRC or

GATE + pin, and connect the output of the external device to the SRC or

GATE – pin, as shown in Figure 3.

Figure 3. Referenced to Supply

Note Connecting the NI SCC-CTR01 as referenced to the supply reverses the digital

logic. To operate the NI SCC-CTR01 with TTL devices, reference the NI SCC-CTR01 to

the supply, as shown in Figure 3.

Note When placing a relatively slow rise time signal—such as a 5 V peak sine or triangle

wave—on one of the inputs, and a fast rise time, high voltage signal—such as a 400 kHz,

48 V square wave—on the other input, crosstalk between input lines can cause false

triggering. You should separate the input wires as much as possible. If you are using an

M Series DAQ device, consult the M Series User Manual for information about applying

the appropriate digital filter to prevent incorrect measurements.

NI SCC-CTR01

SRC or

GATE –

SRC or

GATE +

or GND

Device

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