National Instruments SCC-DO01 User manual

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.( X )
3
16 Ω
16 Ω
66.5 Ω
1/2 w
1
Vss
VCOM
D GND
+
–
VOUT
IO1
5–24 VDC
= External voltage source may be floating or ground-referenced.
2
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.
3
16 Ω
16 Ω
66.5 Ω
1/2 w
1
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.( X )
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
0
40
80
120
0.5 0.9
Load Current
I
O1
(mA)
1.3 1.7
Output Voltage Level (V)
24
0
40
80
22 20
Output Voltage Level (V)
Load Current
I
O2
(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 —
5
4
2
1
3

©National Instruments Corporation 11 SCC-DO01 Isolated Digital Output Module User Guide
Theory of Operation
Setting the Power-Up State of the SCC-DO01
The switch for setting the power-up state of the SCC-DO01 is on the top of
the module. Switch it to High or Low depending on whether you want the
output state to be high or low on power-up. The switch does not override
the output state as determined by the E Series DAQ device.
Status LED
The SCC-DO01 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.
Circuit Protection
Protection Against Spike Voltages
Two clamping diodes protect the SCC-DO01 against spike voltages caused
by inductive loads and long circuit wires. One diode is connected across
VSS and VOUT and the other diode is connected across VOUT and VCOM.
14 —
15 —
16 —
17 —
18 —
19 —
20 —
Table 1. SCC-DO01 Pin Signal Connections (Continued)
Pin Number Signal

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© 2002–2004 National Instruments Corp. All rights reserved.
371077B-01
Mar04
*371077B-01*
Signal Isolation
The VCOM, VSS, and VOUT signals on each SCC-DO01 are isolated from
other channels and from the SCC-DO01 internal power and ground signals.
The isolation barrier protects the SCC-DO01 and other equipment from
voltages up to +42 VDC. Common-mode voltages higher than +42 VDC
can damage the SCC-DO01 and other equipment.