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National Instruments SCC-DI01 User Manual

Isolated digital input module
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USER GUIDE
SCC-DI01 Isolated Digital Input
Module
Conventions
»
bold
italic
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.
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 text denotes items that you must select in software, such as menu
items and dialog box options. Bold text also denotes parameter names.
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.

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Summary of Contents for National Instruments SCC-DI01

  • Page 1 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: »...

  • Page 2: What You Need To Get Started

    SC-2345 refers to both the SC-2345 connector block and the SC-2345 with configurable connectors. 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: –...

  • Page 3: Device Specific Information

    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 X is 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)

  • Page 4: Specifications

    (3.50 in. × 1.15 in. × 0.73 in.) Mass............28.6 g (1.0 oz) 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. SCC-DI01 Isolated Digital Input Module User Guide ni.com...

  • Page 5: Maximum Working Voltage

    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: •...

  • Page 6: Electromagnetic Compatibility

    Refer to the Declaration of Conformity (DoC) for this product for any additional Note regulatory compliance information. To obtain the DoC for this product, visit , search by model number or product line, and click the ni.com/hardref.nsf appropriate link in the Certification column. SCC-DI01 Isolated Digital Input Module User Guide ni.com...

  • Page 7: I/O Connector Pin Assignments

    Table 1 lists the signal connection corresponding to each pin. GND is the reference for the +5 V supply. Table 1. SCC-DI01 Module Pin Assignments Pin Number Signal Name — — — — — — P0.(X) — +5 V — © National Instruments Corporation SCC-DI01 Isolated Digital Input Module User Guide...

  • Page 8: Theory Of Operation

    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...
  • Page 9 V 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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