National Instruments 9861 User manual

GETTING STARTED GUIDE
NI 9861
1-Port, Low-Speed/Fault Tolerant CAN Module
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This document explains how to connect to the NI 9861.

The NI 9861 module requires the latest NI-XNET software to be
installed. The latest version of the NI-XNET software is at
ni.com/downloads.
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 9861. 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 9861 only as described in this document.
Hot Surface This icon denotes that the component
may be hot. Touching this component may result in
bodily injury.
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Caution Do not operate the NI 9861 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 Guidelines for Hazardous Locations
The NI 9861 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
and Ex nA IIC T4 hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9861 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.
Caution Do not remove modules unless power has
been switched off or the area is known to be
nonhazardous.
NI 9861 Getting Started Guide | © National Instruments | 3

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 IP54
as defined by IEC/EN 60079-15.
Caution For Zone 2 applications, install a protection
device between the CAN signals and the NI 9861 CAN
pins. The device must prevent the CAN Port-to-COM
voltage from exceeding 55 V if there is a transient
overvoltage condition.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9861 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 07 ATEX 0626664X and is
IECEx 14.0089X certified. Each NI 9861 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 9861
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 You must make sure that transient
disturbances do not exceed 140% of the rated voltage.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 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.
Wiring the NI 9861
The NI 9861 has one 9-pin male D-Sub connector that provides
connections to a CAN bus. The NI 9861 has pins for CAN_H and
CAN_L, to which you connect the CAN bus signals. Connect
these signals using twisted-pair cable.
The port has two isolated common pins (COM) that are internally
connected to the module’s isolated reference and serve as the
NI 9861 Getting Started Guide | © National Instruments | 5

reference ground for CAN_H and CAN_L. You can connect the
CAN bus reference ground (sometimes referred to as CAN_V-) to
one or both COM pins. The port also has an optional shield pin,
SHLD, that you can connect to a shielded CAN cable.
Connecting SHLD may improve signal integrity and EMC
performance in a noisy environment.
Caution You must use a UL listed ITE power supply
marked LPS with the NI 9861.
The NI 9861 requires an external power supply of +9 to +30 V to
operate. Supply power from the CAN bus to the VSUP pin.
Note Power on VSUP is required for CAN operation.
The NI 9861 pinout is listed in Table 1.
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Table 1. Pin Assignments for the NI 9861
Connector Pin Signal
6
7
8
9
1
2
3
4
5
1 No Connection (NC)
2 CAN_L
3 COM
4 NC
5 SHLD
6 COM
7 CAN_H
8 NC
9 VSUP
CAN Bus Topology and Termination
A CAN bus consists of two or more CAN nodes cabled together.
The CAN_H and CAN_L pins of each node are connected to the
NI 9861 Getting Started Guide | © National Instruments | 7

main CAN bus cable through a short connection known as a
“stub.” The pair of signal wires, CAN_H and CAN_L, constitutes
a transmission line. Every device on a low-speed/fault-tolerant
CAN network requires a termination resistor for each CAN data
line: RRTH for CAN_H and RRTL for CAN_L.
Figure 1 shows a simplified diagram of a low-speed/fault-tolerant
CAN bus with termination resistor placements.
Figure 1. CAN Bus Topology and Termination Resistor Locations
RTL CAN_L RTH CAN_H RTL CAN_L RTH CAN_H RTL CAN_L RTH CAN_H
CAN_H
CAN_L
Low-speed/Fault-Tolerant
CAN Device
Low-speed/Fault-Tolerant
CAN Device
Low-speed/Fault-Tolerant
CAN Device
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Connecting a CAN Bus to the NI 9861
You can connect each port of the NI 9861 to any location on a
CAN bus. Figure 2 shows one example of connecting the
NI 9861 directly to one CAN node.
Figure 2. Connecting Both Ports of the NI 9861 to CAN Buses
NI 9861
CAN Device
CAN
Cable
(With
Optional
Shield)
(SHLD)
CAN_H
CAN_L
Vsup
COM
(SHLD)
CAN_H
CAN_L
Vsup
COM
NI 9861 Getting Started Guide | © National Instruments | 9

Cabling Requirements for the NI 9861
Cable Specifications
Cables should meet the physical medium requirements specified
in ISO 11898, shown in the following table. Belden cable
(3084A) meets all these requirements and should be suitable for
most applications.
Table 2. ISO 11898 Specifications for Characteristics of a CAN_H and
CAN_L Pair of Wires
Characteristic Value
Length-related resistance 90 mΩ/m nominal
Length-related capacitance: CAN_L and ground,
CAN_H and ground, CAN_L and CAN_H
30 pF/m nominal
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Determining the Necessary Termination
Resistance for the Board
Unlike High-Speed CAN, Low-Speed/Fault-Tolerant CAN
requires termination at the Low-Speed/Fault-Tolerant CAN
transceiver instead of on the cable itself. Termination requires
two resistors, RTH for CAN_H and RTL for CAN_L. This
configuration allows the NXP Fault-Tolerant CAN transceiver to
detect and recover from bus faults. It is important to determine
the overall termination of the existing network, or the termination
of the individual device, before connecting it to a Low-Speed/
Fault-Tolerant port. NXP recommends an overall RTH and RTL
termination of 100 to 500 Ω (each) for a properly terminated low-
speed network.
Termination on the low-speed/fault-tolerant ports of the NI 9861
is set through the NI-XNET software to either 1 kΩ or 5 kΩ.
Number of CAN Nodes
The maximum number of nodes depends on the electrical
characteristics of the nodes on the network. If all of the nodes
meet the requirements of Low-Speed/Fault-Tolerant CAN, up to
32 nodes may be connected to the bus.
NI 9861 Getting Started Guide | © National Instruments | 11

NI 9861 Hardware Overview
The NI 9861 has one full-featured, independent CAN port that is
isolated from the other modules in the system. The port has a
Bosch DCAN CAN controller that is CAN 2.0B-compatible and
fully supports both 11-bit and 29-bit identifiers. The port also has
an NXP TJA 1054AT Low-Speed/Fault-Tolerant CAN
transceiver that is fully compatible with the ISO 11898 standard
and supports baud rates up to 125 Kbps.
Figure 3. NI 9861 Hardware Overview
Ext Pwr
Supply
Required
Rx
Tx
CAN
Controller
CAN_H
CAN_L
CAN
Transceiver
Rx
Tx
COM
Vsup
+
_
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NI 9861 Specifications
The following specifications are typical for the range -40 °C to
70 °C unless otherwise noted.
Low-Speed/Fault Tolerant CAN Characteristics
...........................................................Transceiver NXT TJA 1054AT
...........................................................Max baud rate 125 Kbps
...........................................................CAN_H, CAN_L bus
lines voltage
-27 to +40 VDC
...........................................................CAN Supply voltage
range (VSUP)
+9 to +30 VDC
...........................................................MTBF Contact NI for Bellcore
MTBF specifications at
other temperatures or for
MIL-HDBK-217F
specifications.
NI 9861 Getting Started Guide | © National Instruments | 13

Power Requirements
...........................................................Power consumption from
chassis
1 W max (active mode)
...........................................................Thermal dissipation
(at 70 °C)
1.25 W max (active mode)
Physical Characteristics
To clean the module, wipe it with a dry towel.
...........................................................Weight Approx. 144 g (5.0 oz)
Safety
Connect only voltages that are within the following limits:
Maximum Voltage1
...................................................Port-to-COM -27 to +40 VDC max,
Measurement Category I
1The maximum voltage that can be applied or output between any port or VSUP
terminal and a COM terminal without creating a safety hazard.
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Isolation
Port-to-earth ground
...........................................Continuous 60 VDC,
Measurement Category I
...........................................Withstand 500 Vrms, 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
equipment, limited-energy parts of equipment, circuits powered
by regulated low-voltage sources, and electronics.
Caution Do not connect the NI 9861 to signals or use
for measurements within Measurement Categories II,
III, or IV.
NI 9861 Getting Started Guide | © National Instruments | 15

Hazardous Locations
...........................................................U.S. (UL) Class I, Division 2, Groups
A, B, C, D, T4; Class I,
Zone 2, AEx nA IIC T4
...........................................................Canada (C-UL) Class I, Division 2, Groups
A, B, C, D, T4; Class I,
Zone 2, Ex nA IIC T4
...........................................................Europe (DEMKO) Ex nA IIC T4 Gc
Safety and Hazardous Locations Standards
This product is designed to meet the requirements of the
following electrical equipment safety standards for measurement,
control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
• EN 60079-0:2012, EN 60079-15:2010
• IEC 60079-0: Ed 6, IEC 60079-15; Ed 4
• UL 60079-0; Ed 5, UL 60079-15; Ed 3
• CSA 60079-0:2011, CSA 60079-15:2012
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Note For UL and other safety certifications, refer to
the product label or the Online Product Certification
section.
Electromagnetic Compatibility
This product meets the requirements of the following EMC
standards for sensitive electrical equipment for measurement,
control, and laboratory use:
• EN 61326 (IEC 61326): Class A emissions; Industrial
immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• AS/NZS CISPR 11: Group 1, Class A emissions
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions
Note For the standards applied to assess the EMC of
this product, refer to the Online Product Certification
section.
Note For EMC compliance, operate this device with
shielded cables.
NI 9861 Getting Started Guide | © National Instruments | 17

CE Compliance
This product meets the essential requirements of applicable
European Directives, as follows:
• 2014/35/EU; Low-Voltage Directive (safety)
• 2014/30/EU; Electromagnetic Compatibility Directive
(EMC)
• 94/9/EC; Potentially Explosive Atmospheres (ATEX)
Online Product Certification
Refer to the product Declaration of Conformity (DoC) for
additional regulatory compliance information. To obtain product
certifications and the DoC for this product, visit ni.com/
certification, search by model number or product line, and click
the appropriate link in the Certification column.
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Shock and Vibration
To meet these specifications, you must panel mount the system.
Operating vibration
...................................................Random (IEC
60068-2-64)
5 grms, 10 Hz to 500 Hz
...................................................Sinusoidal (IEC
60068-2-6)
5 g, 10 Hz to 500 Hz
...........................................................Operating shock (IEC
60068-2-27)
30 g, 11 ms half sine; 50 g,
3 ms half sine;
18 shocks at 6 orientations
Environmental
Refer to the manual for the chassis you are using for more
information about meeting these specifications.
...........................................................Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
...........................................................Storage temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 85 °C
NI 9861 Getting Started Guide | © National Instruments | 19

...........................................................Ingress protection IP40
...........................................................Operating humidity
(IEC 60068-2-78)
10% RH to 90% RH,
noncondensing
...........................................................Storage humidity
(IEC 60068-2-78)
5% RH to 95% RH,
noncondensing
...........................................................Pollution Degree 2
...........................................................Maximum altitude 2,000 m
Indoor use only.
Environmental Management
NI is committed to designing and manufacturing products in an
environmentally responsible manner. NI recognizes that
eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.
For additional environmental information, refer to the Minimize
Our Environmental Impact web page at ni.com/environment. This
page contains the environmental regulations and directives with
which NI complies, as well as other environmental information
not included in this document.
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