National Instruments SCC-DI01 Bedienungsanleitung

USER GUIDE

SCC-DI01 Isolated Digital Input

Module

The SCC-DI01 is a single-channel, optically isolated digital input module

that can sense AC and DC digital signals, including TTL, up to 30 VDC or

30 VAC.

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, see 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.

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

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

or value that you must supply.

SCC-DI01 Isolated Digital Input Module User Guide 2 ni.com

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.

SC-2345 SC-2345 refers to both the SC-2345 connector block and the 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 SCC-DI01, you need the following items:

❑SC-2345/2350 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 SCC-DI01 modules

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

❑SCC-DI01 Isolated Digital Input Module User Guide

❑SCC Quick Start Guide, available at ni.com

❑Read Me First: Safety and Radio-Frequency Interference

❑SC-2345 Quick Reference Label

❑68-pin E Series DAQ device, documentation, and 68-pin cable of less

than 2 m length

❑1/8 in. flathead screwdriver

❑Numbers 1 and 2 Phillips screwdrivers

❑Wire insulation strippers

❑NI-DAQ (current version) for Windows 2000/NT/XP/Me

Note The Macintosh operating system is not supported.

©National Instruments Corporation 3 SCC-DI01 Isolated Digital Input Module User Guide

Device Specific Information

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

information about the SC-2350 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.

Plug the SCC-DI01 into any digital input/output socket J(X+9), where Xis

0 to 7, on the SC-2345. When you follow the procedure in the SCC Quick

Start Guide, the SC-2345 routes the digital input signal to channel P0.(X)

on the E Series DAQ device.

Connecting the Input Signals

Note The signal names have changed. Refer to ni.com/info and enter rdtntg

to confirm the signal names.

Figure 1. SCC-DI01 Signal Connections

For information about how to configure the SCC-DI01 module using

NI-DAQmx, refer to the SCC Quick Start Guide.

SCC-DI01Signal

Source

Status

LED

3.3 kΩ

1/2 W

COM

–

E Series

P0.(

)

D GND

+5 V

SCC-DI01 Isolated Digital Input Module User Guide 4 ni.com

Specifications

These specifications are typical at 25 °C unless otherwise stated.

Input Characteristics

Number of channels................................1

Maximum input voltage..........................30 VDC or 30 VAC

Digital logic levels

Input current

5 V input..........................................1.5 mA

24 V input........................................7.0 mA

Isolation ..................................................42 VDC from computer ground

Propagation delay

Low to high......................................10 µs1

High to low......................................250 µs1

Rise time .................................................10 ns max

Fall time..................................................10 ns max

Power Requirement

Digital power ..........................................61 mW max

Physical Characteristics

Dimensions .............................................8.89 cm ×2.92 cm ×1.85 cm

(3.50 in. ×1.15 in. ×0.73 in.)

Mass........................................................28.6 g (1.0 oz)

Level Min Max

Input low voltage

(DC or Peak AC) —±1 V

Input high voltage

1 kHz AC

±2 VDC

4 Vrms

±30 VDC

30 VAC

1 The switching characteristics (turn-on time, switching time, and turn-off time) of the optical isolator used on the board limit

the data transfer rate.

©National Instruments Corporation 5 SCC-DI01 Isolated Digital Input Module User Guide

I/O connectors ........................................ One 20-pin right-angle

male connector;

one 2-pin screw terminal

Field-wiring diameter............................. 28 to 16 AWG

Maximum Working Voltage

Maximum working voltage refers to the signal voltage plus the

common-mode voltage.

Channel to earth ..................................... 42 V, Installation Category 2

Module to module .................................. 42 V, Installation Category 2

Environmental

Operating temperature............................ 0 to 50 °C

Storage temperature ............................... –20 to 70 °C

Humidity ................................................ 10 to 90% RH, noncondensing

Maximum altitude .................................. 2,000 m

Pollution Degree (indoor use only) ........ 2

Safety

The SCC-DI01 meets the requirements of the following standards

for safety and electrical equipment for measurement, control, and

laboratory use:

• IEC 61010-1, EN 61010-1

• UL 3101-1, UL 61010B-1

• CAN/CSA C22.2 No. 1010.1

Note For UL and other safety certifications, refer to the product label, or visit

ni.com/hardref.nsf, search by model number or product line, and click the

appropriate link in the Certification column.

SCC-DI01 Isolated Digital Input Module User Guide 6 ni.com

Electromagnetic Compatibility

Emissions................................................EN 55011 Class A at 10 m

FCC Part 15A above 1 GHz

Immunity ................................................EN 61326:1997 + A2:2001,

Table 1

CE, C-Tick, and FCC Part 15 (Class A) Compliant

Note For full EMC compliance, operate this device with shielded cabling. In addition,

all covers and filler panels must be installed.

CE Compliance

This product meets the essential requirements of applicable European

Directives, as amended for CE marking, as follows:

Low-Voltage Directive (safety)..............73/23/EEC

Electromagnetic Compatibility

Directive (EMC) .....................................89/336/EEC

Note Refer to the Declaration of Conformity (DoC) for this product for any additional

regulatory compliance information. To obtain the DoC for this product, visit

ni.com/hardref.nsf, search by model number or product line, and click the

appropriate link in the Certification column.

©National Instruments Corporation 7 SCC-DI01 Isolated Digital Input Module User Guide

I/O Connector Pin Assignments

Figure 2 shows the I/O connector pins on the bottom of the module.

Figure 2. SCC Module Bottom View

Table 1 lists the signal connection corresponding to each pin. GND is the

reference for the +5 V supply.

1Pin1 2Pin2 3PWBKey 4 Pin19 5Pin20

Table 1. SCC-DI01 Module Pin Assignments

Pin Number Signal Name

1 —

2 —

3 —

4 —

5 —

6 —

7P0.(X)

8 —

9+5 V

10 GND

11 —

SCC-DI01 Isolated Digital Input Module User Guide 8 ni.com

Theory of Operation

Power-Up Condition

At power-up, the SCC-DI01 registers a logic low if there are no

connections to the inputs.

Status LED

The SCC-DI01 has a status LED that indicates when an input signal

registers a logic high or a logic low. The LED is located above the screw

terminals. If the LED is off, the input signal is registering a logic low on the

digital line. If the LED is on, the input signal is registering a logic high on

the digital line.

Sensing DC Voltages

The SCC-DI01 registers a logic high when a positive or negative

DC voltage of 2 V or more exists across the screw terminals. If no

voltage is present, the SCC-DI01 registers a logic low.

Sensing AC Voltages

The SCC-DI01 registers a logic high when an AC voltage exists across the

screw terminals. Signals with low amplitude and low frequency cause the

SCC-DI01 to register alternating logic highs and logic lows. Sinusoidal

signals of 1 kHz or higher frequency and 4 Vrms or higher amplitude cause

the SCC-DI01 to register a constant logic high.

12 —

13 —

14 —

15 —

16 —

17 —

18 —

19 —

20 —

Table 1. SCC-DI01 Module Pin Assignments (Continued)

Pin Number Signal Name

National Instruments™, NI™, ni.com™, and NI-DAQ™ are trademarks of National Instruments

Corporation. 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.

371076B-01

Mar04

*371076B-01*

Isolating Signals

The VIN and VCOM signals are isolated from the inputs of other channels

and are also isolated from the SCC-DI01 internal power and ground

signals. The isolation barrier protects the SCC-DI01 and other equipment

connected to it from voltages up to +42 VDC. Voltages higher than

+42 VDC can damage the SCC-DI01 and other equipment.

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