National Instruments NI 9351 User manual

GETTING STARTED GUIDE
NI 9351
4-Ch 0-20 mA 16-bit AI, 4-Ch 24 V Sinking DI,
4-Ch 24 V Sourcing DO, SIL3 Capable

This document provides information about connecting and
installing the NI 9351 hardware. You must download a compiled
User Program before deployment. For information about creating
User Programs, deploying safety systems using the NI 9351, and
diagnostics available on the NI 9351, go to ni.com/info and enter
Info Code safetymanual.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9351. The other components in the system might
not meet the same safety ratings. Refer to the
documentation for each component in the system to
determine the safety and EMC ratings for the entire
system.
Safety Guidelines
Operate the NI 9351 only as described in this document.
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Caution This icon denotes a caution, which advises
you to consult documentation where this symbol is
marked.
Caution Do not operate the NI 9351 in a manner not
specified in this document. 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 NI for
repair.
Safety Voltages
Connect only voltages that are within the following limits:
Caution Do not connect hazardous voltages to the
NI 9351. A hazardous voltage is a voltage greater than
42.4 V peak voltage or 60 V DC to earth ground.
Maximum voltages
Vsup-to-COM 30 V DC
DI-to-COM 30 V DC
DO-to-COM 0 V DC to Vsup
NI 9351 Getting Started Guide | © National Instruments | 3

AI-to-COM 20 V DC
AI Vsup-to-COM 30 V DC
Caution DO channels are not protected for negative
voltages or voltages greater than Vsup.
Isolation voltages
Channel-to-earth1 (up to 5,000 m)
Continuous 60 V DC, Measurement
Category I
Withstand 1,000 V RMS, verified by a 5 s
dielectric withstand test
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
1Channels include Vsup, AI Vsup, and COM.
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equipment, limited-energy parts of equipment, circuits powered
by regulated low-voltage sources, and electronics.
Caution Do not connect the NI 9351 to signals or use
for measurements within Measurement Categories II,
III, or IV.
Note Measurement Categories CAT I and CAT O are
equivalent. These test and measurement circuits are for
other circuits not intended for direct connection to the
MAINS building installations of Measurement
Categories CAT II, CAT III, or CAT IV.
Safety Guidelines for Hazardous Locations
The NI 9351 is suitable for use in Class I, Division 2, Groups A,
B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4
Gc and Ex nA IIC T4 Gc hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9351 in a potentially explosive environment. Not following
these guidelines may result in serious injury or death.
Caution Do not disconnect I/O-side wires or
connectors unless power has been switched off or the
area is known to be nonhazardous.
NI 9351 Getting Started Guide | © National Instruments | 5

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, or Zone 2.
Caution The system must be installed in an enclosure
certified for the intended hazardous (classified)
location, having a tool secured cover/door, where a
minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9351 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO 12 ATEX 1202658X and is IECEx UL 14.0089X
certified. Each NI 9351 is marked II 3G and is suitable for use
in Zone 2 hazardous locations, in ambient temperatures of -40 °C
≤ Ta ≤ 70 °C. If you are using the NI 9351 in Gas Group IIC
hazardous locations, you must use the device in an NI chassis that
has been evaluated as Ex nC IIC T4, Ex IIC T4, Ex nA IIC T4, or
Ex nL IIC T4 equipment.
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Caution Transient protection shall be provided that is
set at a level not exceeding 140% of the peak rated
voltage value of 85 V at the supply terminals to the
equipment.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC/EN 60664-1.
Caution The system shall be mounted in an
ATEX/IECEx-certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in
IEC/EN 60079-15.
Caution The enclosure must have a door or cover
accessible only by the use of a tool.
EMC Guidelines
This product was tested and complies with the regulatory
requirements and limits for electromagnetic compatibility (EMC)
stated in the product specifications. These requirements and
limits provide reasonable protection against harmful interference
when the product is operated in the intended operational
electromagnetic environment.
NI 9351 Getting Started Guide | © National Instruments | 7

This product is intended for use in industrial locations. However,
harmful interference may occur in some installations, when the
product is connected to a peripheral device or test object, or if the
product is used in residential or commercial areas. To minimize
interference with radio and television reception and prevent
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.
Refer to the following guidelines to ensure specified EMC
performance.
Notice Operate this product only with shielded cables
and accessories.
Notice Keep the chassis ground connection to the
cable shield as short as possible.
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Special Conditions for Marine Applications
Some products are approved for marine (shipboard) applications.
To verify marine approval certification for a product, visit ni.com/
certification and search for the certificate.
Notice In order to meet the EMC requirements for
marine applications, install the product in a shielded
enclosure with shielded and/or filtered power and
input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes
and cables to ensure that the desired EMC performance
is attained.
Preparing the Environment
Ensure that the environment in which you are using the NI 9351
meets the following specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
Operating humidity
(IEC 60068-2-30)
10% RH to 90% RH,
noncondensing
NI 9351 Getting Started Guide | © National Instruments | 9

Pollution Degree 2
Maximum altitude 5,000 m
Indoor use only.
Note Refer to the device datasheet on ni.com/manuals
for complete specifications.
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NI 9351 Pinout
Vsup
AI COM
AI Vsup
AI Vsup
COM
DO1
DO0
AI Vsup
AI Vsup
AI COM
DO3
DO2
COM
COM
AI COM
AI1
AI0
COM
DI1
DI0
AI3
AI2
AI COM
DI3
DI2
COM
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
26
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Table 1. Signal Descriptions
Signal Description
AI Analog input signal connection
AI COM Analog input common reference connection. Internally
connected to COM.
AI Vsup Voltage supply connection. Not internally connected to Vsup.
COM Common reference connection
DI Digital input signal connection
DO Digital output signal connection
Vsup Voltage supply connection
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NI 9351 LEDs
2
1
0
Table 2. LED Descriptions
LED Description
Vsup/Status
0 Internal Fault
1 I/O Fault
2 UserLED0
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Table 3. LED Indicators
LED LED
Color
LED Pattern Indication
Vsup/Status Green
On
Module is powered on.
Module is in Operational
Mode and User Program is
running.
Flashing
Module powered on. Module
is not in Operational Mode or
User Program is not running.
Off Module is powered off.
Internal Fault Red
Flashing Module is in Fail-safe Mode.
Off Module is not in Fail-safe
Mode.
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Table 3. LED Indicators (Continued)
LED LED
Color
LED Pattern Indication
I/O Fault Red
Flashing An I/O fault has been
detected.
Off No I/O Fault has been
detected.
UserLED0 Red
On
User-configurable.Flashing
Off
Note Refer to the C Series Functional Safety Manual
on ni.com/manuals for detailed information on flash
patterns in status and fault LEDs.
NI 9351 Getting Started Guide | © National Instruments | 15

Installing the Connector Backshell
Caution You must use the included connector
backshell to secure connections to the NI 9351.
Figure 1. Connector Backshell Installation
1
2
3
1. Align the connector backshell with the 26-pin spring terminal
block.
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2. Secure the cable bundle to the connector backshell using a
zip tie.
3. Secure the connector backshell using the captive screws.
Tighten to 0.5 N · m (4 lb · in.) torque.
Connecting an External Power Supply
You must connect an external power supply to the NI 9351. The
module is independent from the chassis and requires an external
power supply to operate.
Connect the positive lead of the power supply to the supply pin,
Vsup, and the negative lead of the power supply to any common
pin, COM.
Caution Do not remove or insert modules if the
external power supply connected to the Vsup and COM
pins is powered on.
The NI 9351 has current sourcing outputs, meaning the DO pin is
driven to Vsup when the channel is turned on.
NI 9351 Getting Started Guide | © National Instruments | 17

Powering Analog Devices
You can connect an external power supply to the NI 9351 to
power analog devices connected to the module. Connect the
positive lead of the power supply to a AI Vsup pin and the
negative lead of the power supply to AI COM. Install a
2 A maximum, fast-acting fuse between the external power
supply and the AI Vsup pin.
Note The AI Vsup pins are internally connected to
each other. You can connect only one external voltage
supply to the device.
Caution Do not remove or insert modules if the
external power supply connected to the AI Vsup and
AI COM pins is powered on.
Functional Safety Editor I/O Configurations
Refer to the following diagrams to connect the NI 9351 based on
the I/O configurations in the Functional Safety Editor. For more
information about I/O Configurations, refer to the C Series
Functional Safety Manual on ni.com/manuals.
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Digital Connections
NI 9351 Input Connection
NI 9351
+
–COM
DI
External
Power
Supply
3 kΩ
(Optional)
• Use this diagram for single input and dual input
configurations.
• Use one of the following pairs for dual switches: DI0 and
DI1, DI2 and DI3.
NI 9351 Getting Started Guide | © National Instruments | 19

NI 9351 Single Input with Test Pulse Connection
NI 9351
DI
DO
External
Power
Supply
+
–
Vsup
COM
3 kΩ
(Optional)
• Use this diagram for single input with test pulse
configurations.
• Use test pulses to detect wiring faults on NC (normally
closed) switches.
• Connect the DO pin to the NC (normally closed) switch to
provide test pulse output.
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