National Instruments NI 9401 User manual

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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9401
8-Channel, TTL Digital Input/Output Module
ni.com/manuals
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2|ni.com |NI 9401 Operating Instructions and Specifications
This document describes how to use the National Instruments 9401
and includes specifications and terminal assignments for the
NI 9401. For information about installing, configuring, and
programming the system, refer to the system documentation. Visit
ni.com/info and enter the following Info Codes:
•cseriesdoc—for information about C Series and system
documentation.
•compatibility—for information about chassis and carrier
compatibility for the modules you are using.
•rdsoftwareversion—for information about which software
you need for the modules you are using.
Note The safety guidelines and specifications in this
document are specific to the NI 9401. The other
components in the system might not meet the same safety
ratings and specifications. Refer to the documentation for
each component in the system to determine the safety
ratings and specifications for the entire system. Visit
ni.com/info and enter cseriesdoc for information
about C Series documentation.

NI 9401 Operating Instructions and Specifications |© National Instruments |3
Safety Guidelines
Operate the NI 9401 only as described in these operating
instructions.
Hot Surface This icon denotes that the component may
be hot. Touching this component may result in bodily
injury.
Caution Do not operate the NI 9401 in a manner not
specified in these operating instructions. Product misuse
can result in a hazard. You can compromise the safety
protection built into the product if the product is damaged
in any way. If the product is damaged, return it to National
Instruments for repair.
Safety Guidelines for Hazardous Locations
The NI 9401 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4, and
Ex nC IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if you are installing the NI 9401 in a
potentially explosive environment. Not following these guidelines
may result in serious injury or death.

4|ni.com |NI 9401 Operating Instructions and Specifications
Caution Do not disconnect I/O-side wires or connectors
unless power has been switched off or the area is known
to be nonhazardous.
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Division 2 and Zone 2 applications, install
the system in an enclosure rated to at least IP 54 as
defined by IEC 60529 and EN 60529.
Caution For Division 2 and Zone 2 applications,
connected signals must be within the following limit:
Capacitance .......................... 0.2 μF max

NI 9401 Operating Instructions and Specifications |© National Instruments |5
Special Conditions for Hazardous Locations Use in
Europe
This equipment has been evaluated as EEx nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9401 in Gas Group IIC hazardous
locations or in ambient temperatures of -40 °C ≤Ta ≤70 °C, you
must use the device in an NI chassis that has been evaluated as
EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory
requirements and limits for electromagnetic compatibility (EMC)
as stated in the product specifications. These requirements and
limits are designed to provide reasonable protection against
harmful interference when the product is operated in its intended
operational electromagnetic environment.
This product is intended for use in industrial locations. There is no
guarantee that harmful interference will not occur in a particular
installation, when the product is connected to a test object, or if the
product is used in residential areas. To minimize the potential for

6|ni.com |NI 9401 Operating Instructions and Specifications
the product to cause interference to radio and television reception
or to experience unacceptable performance degradation, install and
use this product in strict accordance with the instructions in the
product documentation.
Furthermore, any changes or modifications to the product not
expressly approved by National Instruments could void your
authority to operate it under your local regulatory rules.
Caution To ensure the specified EMC performance,
operate this product only with shielded cables and
accessories.
Caution To ensure the specified EMC performance, you
must install a clamp-on ferrite bead (National
Instruments part number 711627-01) in accordance with
the product installation instructions. Refer to the NI 9401
product page on ni.com for purchasing information
about clamp-on ferrite beads.

NI 9401 Operating Instructions and Specifications |© National Instruments |7
Cable Requirements for EMC Compliance
Select and install cables for the NI 9401 in accordance with the
following requirements:
• Install a clamp-on ferrite bead (National Instruments part
number 711627-01) on cable that you are connecting to NI 9401.
• The clamp-on ferrite bead must be connected to the cable as
close to the module as possible. Placing the ferrite elsewhere
on the cable noticeably impairs its effectiveness.
Figure 1. Installing a Ferrite Bead
1 Installing a ferrite bead on a 25-pin DSUB cable.
2 Installing a ferrite bead on the cable of the NI 9924 terminal block.
1 2

8|ni.com |NI 9401 Operating Instructions and Specifications
Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification, visit
ni.com/certification and search for the LR certificate, or
look for the Lloyd’s Register mark on the module.
Caution To meet radio frequency emission
requirements for marine applications, use shielded cables
and install the system in a metal enclosure. Suppression
ferrites must be installed on power supply inputs near
power entries to modules and controllers. Power supply
and module cables must be separated on opposite sides of
the enclosure and must enter and exit through opposing
enclosure walls.

NI 9401 Operating Instructions and Specifications |© National Instruments |9
Connecting the NI 9401
The NI 9401 has a 25-pin DSUB connector that provides
connections for eight digital input/output channels.
Figure 2. NI 9401 Pin Assignments
COM
NC
COM
COM
NC
COM
COM
NC
COM
COM
NC
COM
COM
DIO0
NC
DIO1
DIO2
NC
DIO3
DIO4
NC
DIO5
DIO6
NC
DIO7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

10 |ni.com |NI 9401 Operating Instructions and Specifications
Each channel has a DIO pin to which you can connect a digital
input or output device. The eight DIO channels are internally
referenced to COM, so you can use any of the nine COM lines as
a reference for the external signal.
The DIO channels are grouped in two ports, one containing
channels 0, 1, 2, and 3, and one containing channels 4, 5, 6, and 7.
You can independently configure each digital port in software for
input or output. Note that all four channels in the port must share
the same line direction. Refer to the software help for information
about configuring ports on the NI 9401.
Each channel also has a pull-down resistor and includes
overvoltage, overcurrent, and short-circuit protection. Refer to the
Specifications section for more information about input thresholds
and overvoltage protection. Refer to the Overcurrent Protection
section for more information about overcurrent protection.

NI 9401 Operating Instructions and Specifications |© National Instruments |11
Figure 3 illustrates how to connect an SPI device to the NI 9401.
In this example, the three channels assigned to output signals are
on one port and the channel assigned to an input signal is on the
other port.
Figure 3. Connecting an SPI Device to the NI 9401
NI 9401
DIO3:0
Configured
for Output
DIO7:4
Configured
for Input
SCLK
MOSI
MISO
SS
SPI Device

12 |ni.com |NI 9401 Operating Instructions and Specifications
Figure 4 illustrates how to connect several types of digital devices
to the NI 9401.
Figure 4. Connecting Digital Devices to the NI 9401
TTL Signal
+5 V
+5 V
LED
DIO0 as Input
DIO1 as Input
COM
DIO7 as Output
NI 9401
Dev 3
Dev 2
Dev 1

NI 9401 Operating Instructions and Specifications |© National Instruments |13
Overcurrent Protection
Overcurrent protection on the NI 9401 allows only a specified
amount of current for switching DIO channels or sourcing the
output load. If the NI 9401 goes into an overcurrent state, by
exceeding the specified maximum switching frequency or the
output load, the module power supply begins to drop in voltage
until it completely turns off or the overcurrent condition is
removed. When the module is in this state, it can accept new line
direction configuration and output state data but cannot pass valid
input data to the software. Refer to the Specifications section for
more information about the maximum switching frequency and
output load for each channel.
Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.

14 |ni.com |NI 9401 Operating Instructions and Specifications
Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.
Specifications
The following specifications are typical for the range -40 to 70 °C
unless otherwise noted. All voltages are relative to COM unless
otherwise noted.
Input/Output Characteristics
Number of channels.......................... 8 DIO channels
Default power-on line direction........ Input
Input/output type............................... TTL, single-ended

NI 9401 Operating Instructions and Specifications |© National Instruments |15
Digital logic levels
Input
Voltage ................................. 5.25 V max
High, VIH.............................. 2 V min
Low, VIL ............................... 0.8 V max
Output
High, VOH............................. 5.25 V max
Sourcing 100 μA............ 4.7 V min
Sourcing 2 mA...............4.3 V min
Low, VOL
Sinking 100 μA.............. 0.1 V max
Sinking 2 mA................. 0.4 V max
Maximum input signal switching frequency by number of input
channels, per channel
8 input channels.......................... 9 MHz
4 input channels.......................... 16 MHz
2 input channels.......................... 30 MHz

16 |ni.com |NI 9401 Operating Instructions and Specifications
Maximum output signal switching frequency by number of output
channels with an output load of 1 mA, 50 pF, per channel
8 output channels........................ 5 MHz
4 output channels........................10 MHz
2 output channels........................20 MHz
I/O propagation delay ....................... 100 ns max
I/O pulse width distortion ................. 10 ns typ
Input current (0 V ≤Vin ≤4.5 V)...... ±250 μA typ
Input capacitance .............................. 30 pF typ
Input rise/fall time............................. 500 ns max
Overvoltage protection,
channel-to-COM ............................... ±30 V max on one channel at
a time; however, continued
use at this level will degrade
the life of the module.
MTBF ............................................... 1,244,763 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method

NI 9401 Operating Instructions and Specifications |© National Instruments |17
Note Contact NI for Bellcore MTBF specifications
at other temperatures or for MIL-HDBK-217F
specifications.
Power Requirements
Power consumption from chassis
Active mode ............................... 580 mW max
Sleep mode ................................. 1 mW max
Thermal dissipation (at 70 °C)
Active mode ............................... 580 mW max
Sleep mode ................................. 1 mW max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Weight............................................... 145 g (5.1 oz)

18 |ni.com |NI 9401 Operating Instructions and Specifications
Safety
Maximum Voltage1
Connect only voltages that are within the following limits.
Channel-to-COM .............................. ±30 V max on one channel
at a time, Measurement
Category I
Isolation Voltages
Channel-to-channel........................... None
Channel-to-earth ground
Continuous ................................. 60 VDC, Measurement
Category I
Withstand.................................... 1,000 Vrms, verified by a 5 s
dielectric withstand test
1 The maximum voltage that can be applied or output between any channel and COM
without damaging the module or other devices.

NI 9401 Operating Instructions and Specifications |© National Instruments |19
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live electrical
supply system that powers equipment. This category is for
measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered by
regulated low-voltage sources, and electronics.
Caution Do not connect the NI 9401 to signals or use
for measurements within Measurement Categories II,
III, or IV.
Hazardous Locations
U.S. (UL) .......................................... Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4
Canada (C-UL) ................................. Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4
Europe (DEMKO) ............................ EEx nC IIC T4