National Instruments SCC-DI01 User manual

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
2
1
V
COM
V
IN
+
–
E Series
P0.( X )
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
DC
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 —
5
4
2
1
3

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

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© 2002–2004 National Instruments Corp. All rights reserved.
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.