National Instruments SCC-DO01 Manuale utente

USER GUIDE

SCC-DO01 Isolated Digital Output

Module

The SCC-DO01 is a single-channel, optically isolated digital output

module. The output circuitry consists of a photomos relay and a load

resistor. You can use the SCC-DO01 with a 5–24 VDC external voltage

supply to switch external devices such as transistors and solid-state relays.

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-DO01 Isolated Digital Output 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-DO01, 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-DO01 modules

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

❑SCC-DO01 Isolated Digital Output 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-DO01 Isolated Digital Output 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-DO01 into any digital input/output (P0.) socket J(X+9),

where Xis 0 to 7, on the SC-2345. When you configure the SC-2345

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

routes the output signal from digital line P0.(X) on the E Series DAQ

device.

Connecting Loads to the SCC-DO01

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

confirm the signal names.

Figure 1 and Figure 2 show two ways to connect a load and an external

voltage supply to the SCC-DO01. These configurations have different

electrical characteristics, as described in the Specifications section.

SCC-DO01 Isolated Digital Output Module User Guide 4 ni.com

Figure 1. Connecting a Load RLOAD1 to VCOM and VOUT (Configuration 1)

Figure 1 shows Configuration 1, with a load RLOAD1 connected to the VCOM

and VOUT terminals and a voltage supply connected to the VSS and VCOM

terminals. Connect Configuration 1 to the SCC-DO01 by completing the

following steps:

1. Remove all power from the signal lines.

2. Strip 7 mm (0.27 in.) of insulation from the ends of the signal wires.

3. Insert the wires into the screw terminals.

a. Connect the negative lead of the voltage supply and the negative

lead from RLOAD1 to screw terminal 1, VCOM.

b. Connect the positive lead from RLOAD1 to screw terminal 2, VOUT.

c. Connect the positive lead of the voltage supply to screw

terminal 1, VSS.

4. Tighten the screws to 0.5 to 0.6 N ⋅m (4.4 to 5.3 lb ⋅in.) of torque.

+5 V

E Series SCC-DO01

Status

LED

Power-Up

State Switch

P0.(

)

16 Ω

66.5 Ω

1/2 w

Vss

VCOM

D GND

–

VOUT

IO1

5–24 VDC

= External voltage source may be floating or ground-referenced.

RLOAD1

Load

©National Instruments Corporation 5 SCC-DO01 Isolated Digital Output Module User Guide

Figure 2. Connecting a Load RLOAD2 to VOUT and VSS (Configuration 2)

Figure 2 shows Configuration 2, with a load RLOAD2 connected to the VOUT

and VSS terminals and a voltage supply connected to the VCOM and VSS

terminals. Connect Configuration 2 to the SCC-DO01 by completing the

following steps:

1. Remove all power from the signal lines.

2. Strip 7 mm (0.27 in.) of insulation from the ends of the signal wires.

3. Insert the wires into the screw terminals.

a. Connect the negative lead of the voltage supply to screw

terminal 1, VCOM.

b. Connect the negative lead from RLOAD2 to screw terminal 2, VOUT.

c. Connect the positive lead of the voltage supply and the positive

lead from RLOAD2 to screw terminal 1, VSS.

4. Tighten the screws to 0.5 to 0.6 N ⋅m (4.4 to 5.3 lb ⋅in.) of torque.

For information about configuring the SCC-DO01 module using

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

16 Ω

66.5 Ω

1/2 w

Vss

VCOM

–

IO2

RLOAD2

VOUT

5–24 VDC

= External voltage source may be floating or ground-referenced.

+5 V

E Series SCC-DO01

Status

LED

Power-Up

State Switch

P0.(

)

D GND 2

Load

SCC-DO01 Isolated Digital Output Module User Guide 6 ni.com

Specifications

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

Output Characteristics

Compatibility ..........................................TTL-compatible

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

Supply voltage range ..............................5 to 24 VDC

Digital logic levels

Configuration 1 (refer to Figure 1)

Configuration 2 (refer to Figure 2)

Maximum continuous load current (IO)

Configuration 1................................86 mA

Configuration 2................................120 mA

Minimum load resistance (at VSS =24 V)

RLOAD1 ..............................................196 Ω

RLOAD2 ..............................................184 Ω

Logic Level

Output Voltage Level

between VOUT and VCOM

Low (IO1 = 0 mA) 0 V

High (IO1 = 25 mA) 22 VDC at VSS = 24 V

3 VDC at VSS = 5 V

Logic Level

Output Voltage Level

between VOUT and VCOM

Low (IO2 = 25 mA) 0.4 V

High (IO2 = 0 mA) VSS

©National Instruments Corporation 7 SCC-DO01 Isolated Digital Output Module User Guide

Figure 3. Load Current versus Output Voltage, Configuration 1

Figure 4. Load Current versus Output Voltage, Configuration 2

Propagation delay

Low to high..................................... 400 µs typ1

High to low ..................................... 300 µs typ1

Rise time ................................................ 120 µs typ

Fall time ................................................. 25 µs typ

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.

0.1

120

0.5 0.9

Load Current

(mA)

1.3 1.7

Output Voltage Level (V)

22 20

Output Voltage Level (V)

Load Current

(mA)

18 16

SCC-DO01 Isolated Digital Output Module User Guide 8 ni.com

Power Requirement

Digital power ..........................................69 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)

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-DO01 meets the requirements of the following standards

for safety and electrical equipment for measurement, control, and

laboratory use:

• IEC 61010-1, EN 61010-15

• UL 3111-1, UL 6101B-1

• CAN/CSA C22.2 No. 1010.1

©National Instruments Corporation 9 SCC-DO01 Isolated Digital Output Module User Guide

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

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

the appropriate link in the Certification column.

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.

SCC-DO01 Isolated Digital Output Module User Guide 10 ni.com

Figure 5 shows the I/O connector on the bottom of the SCC-DO01.

Figure 5. 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-DO01 Pin Signal Connections

Pin Number Signal

1 —

2 —

3 —

4 —

5 —

6 —

7P0.(X)

8 —

9+5 V

10 GND

11 —

12 —

13 —

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