OPERATING INSTRUCTIONS
NI 9853
2-Port, High-Speed CAN Module
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Safety Guidelines for Hazardous Locations
The NI 9853 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class I, Zone 2, AEx nA II T4 and
Ex nA II T4 hazardous locations; and nonhazardous locations only.
Follow these guidelines if you are installing the NI 9853 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.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the
CompactRIO system in an enclosure rated to at least
IP 54 as defined by IEC 60529 and EN 60529.
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Caution For Zone 2 applications, install a protection
device between the CAN signals and the NI 9853 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 Safe Use in Europe
This equipment has been evaluated as EEx nA II T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked
locations.
II 3G and is suitable for use in Zone 2 hazardous
Wiring the NI 9853
The NI 9853 has two 9-pin male D-Sub connectors that provide
connections to a CAN bus. Each port on the NI 9853 has pins for
CAN_H and CAN_L, to which you connect the CAN bus signals.
These signals should be connected using twisted-pair cable.
Each port has two common pins (COM) that are internally
connected to the isolated reference of the module and serve as the
reference ground for CAN_H and CAN_L. You can connect the
CAN bus reference ground (sometimes referred to as CAN_V–) to
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one or both of the COM pins. Each port also has an optional shield
pin, SHLD, that can be connected to a shielded CAN cable.
Connecting SHLD may improve signal integrity and EMC
performance in a noisy environment.
CAN0 of the NI 9853 is internally powered, and therefore requires
no external power supply. CAN1 requires an external power supply
of +8 to +25 V to operate. Supply power to the VSUP pin of CAN1
from the CAN bus.
Note Although CAN0 of the NI 9853 does not require an
external power supply to operate, it can be connected to a
powered CAN bus without being damaged.
Pinouts for CAN0 and CAN1 of the NI 9853 are listed in Table 1
and Table 2.
Table 4 lists recommended termination resistor values.
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Table 1. Pin Assignments for CAN0
Connector
Pin
Signal
1
2
3
4
5
6
7
8
9
No Connection (NC)
CAN_L
COM
NC
1
2
3
4
5
6
7
8
9
SHLD
COM
CAN_H
NC
NC
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Table 2. Pin Assignments for CAN1
Connector
Pin
Signal
1
2
3
4
5
6
7
8
9
No Connection (NC)
CAN_L
COM
NC
1
2
3
4
5
6
7
8
9
SHLD
COM
CAN_H
NC
VSUP
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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
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. If the transmission line is not terminated,
each signal change on the bus causes reflections that may cause
communication errors. Because the CAN bus is bidirectional, both
ends of the cable must be terminated. However, this requirement
does not mean that every node on the bus should have a termination
resistor—only the nodes at the end of the cable should have
termination resistors.
Figure 1 shows a simplified diagram of a CAN bus with multiple
CAN nodes, and proper termination resistor (Rt) locations.
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Bus Cable Length
CAN_H
CAN_H
CAN
Node
CAN
Node
R
R
t
t
CAN_L
CAN_L
Stub
Length
CAN
CAN
Node
Node
Figure 1. CAN Bus Topology and Termination Resistor Locations
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Connecting a CAN Bus to the NI 9853
Each port of the NI 9853 can be connected to any location on a
CAN bus. Figure 2 shows one example of the connection of CAN0
of the NI 9853 directly to one CAN node, and CAN1 directly to
another CAN node. CAN1 requires an external power supply on
the CAN bus.
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(SHLD)
CAN_H
(SHLD)
CAN_H
CAN
Cable
R
R
t
t
CAN0
(With
CAN_L
CAN_L
Optional
Shield)
V
V
sup
sup
COM
COM
NI 9853
(SHLD)
CAN_H
(SHLD)
CAN_H
CAN
Cable
R
R
t
t
CAN1
(With
CAN_L
CAN_L
Optional
Shield)
+
–
V
V
sup
sup
COM
COM
External
Power
Supply
Figure 2. Connecting Both Ports of the NI 9853 to CAN Buses
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Cabling Requirements for NI 9853
This section deals with cabling specifications, termination
resistors, cable lengths, and the number of CAN nodes that can
exist in a system.
Cable Specifications
Cables should meet the physical medium requirements specified in
ISO 11898, shown in Table 3. Belden cable (3084A) meets all of
those requirements, and should be suitable for most applications.
Table 3. ISO 11898 Specifications for Characteristics of a CAN_H and
CAN_L Pair of Wires
Characteristic
Value
Impedance
95 Ω minimum, 120 Ω nominal, 140 Ω maximum
70 mΩ/m nominal
Length-related
resistance
Specific line delay
5 ns/m nominal
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Termination Resistors
The termination resistors (Rt) should match the nominal
impedance of the CAN cable, and therefore comply with the values
in Table 4.
Table 4. Termination Resistor Specification
Characteristic
Value
Condition
Termination resistor, Rt
100 Ω min,
Minimum power
dissipation: 220 mW
120 Ω nominal,
130 Ω max
Cable Lengths
The allowable cable length is affected by the characteristics of the
cabling and the desired bit transmission rates. Detailed cable length
recommendations can be found in the ISO 11898, CiA DS 102, and
DeviceNet specifications.
ISO 11898 specifies 40 m total cable length with a maximum
stub length of 0.3 m for a bit rate of 1 Mb/s. The ISO 11898
specification says that significantly longer cable lengths may be
allowed at lower bit rates, but each node should be analyzed for
signal integrity problems.
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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 ISO 11898, at least 30 nodes may be connected
to the bus. Higher numbers of nodes may be connected if the
electrical characteristics of the nodes do not degrade signal quality
below ISO 11898 signal level specifications.
The electrical characteristics of the NI 9853 allow at least
110 CAN ports on a network.
NI 9853 Hardware Overview
The NI 9853 has two full-featured, independent CAN ports that are
isolated from each other, and from the other modules in the system.
Each port of the NI 9853 has a Philips SJA1000 CAN controller
that is CAN 2.0B-compatible and fully supports both 11-bit
and 29-bit identifiers. Each port also has a Philips TJA1041
High-Speed CAN transceiver that is fully compatible with the
ISO 11898 standard and supports baud rates up to 1 Mbps.
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+5 V
GND
+5 V_ISO
Iso Pwr
COM
CAN_H
CAN_L
Rx
Tx
Rx
Tx
CAN
Transceiver
CAN
Controller
CAN0
V
sup
+
Ext Pwr
Supply
+5 V
Reg
_
COM
CAN_H
CAN_L
Rx
Tx
Rx
Tx
CAN
Transceiver
CAN
Controller
CAN1
Figure 3. NI 9853 Hardware Overview
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Sleep Mode (CompactRIO Only)
You can enable sleep mode for the CompactRIO system in
software. In sleep mode, the system consumes less power and may
dissipate less heat. Typically, when a system is in sleep mode, you
cannot communicate with the modules. Refer to the Specifications
section for more information about power consumption and
thermal dissipation.
This system sleep mode should not be confused with the NI 9853
Transceiver Mode Sleep property, which sets only the CAN port to
sleep mode. Refer to the FPGA Module topic in LabVIEW Help for
more information on the Transceiver Mode property.
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Specifications
The following specifications are typical for the range –40 to 70 °C
unless otherwise noted.
High-Speed CAN Characteristics
Transceiver........................................Philips TJA1041
Max baud rate ...................................1 Mbps
CAN_H, CAN_L bus lines
voltage...............................................–27 to +40 VDC
Supply voltage range (VSUP
)
CAN0 .........................................N/A
CAN1 .........................................+8 to +25 VDC
MTBF ...............................................1,816,913 hours at 25 °C;
Bellcore Issue 6, Method 1,
Case 3, Limited Part Stress
Method
Note Contact NI for Bellcore MTBF specifications at
other temperatures or for MIL-HDBK-217F
specifications.
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Power Requirements
Power consumption from chassis
Active mode
Transmitting.........................625 mW max
Receiving .............................400 mW max
Sleep mode .................................25 μW max
Thermal dissipation (at 70 °C)
Active mode ...............................1 W max
Sleep mode .................................250 mW max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Weight...............................................Approx. 144 g (5.0 oz)
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Safety
Maximum Voltage1
Connect only voltages that are within these limits.
Port-to-COM.....................................–27 to +40 VDC max,
Measurement Category I
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 to signals or use for
measurements within Measurement Categories II, III,
or IV.
1
The 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 Voltages
Port-to-port
Withstand....................................500 Vrms, verified by a
dielectric withstand test, 5 s
Continuous .................................60 VDC,
Measurement Category I
Port-to-earth ground
Withstand....................................500 Vrms, verified by a
dielectric withstand test, 5 s
Continuous .................................60 VDC,
Measurement Category I
Safety Standards
The NI 9853 is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:
•
•
IEC 61010-1, EN 61010-1
UL 61010-1, CSA 61010-1
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Note For UL and other safety certifications, refer to the
product label, or visit ni.com/certification, search
by model number or product line, and click the
appropriate link in the Certification column.
Hazardous Locations
U.S. (UL) ..........................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nA II T4
Canada (C-UL) .................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nA II T4
Europe (DEMKO).............................EEx nA II T4
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Environmental
CompactRIO modules are intended for indoor use only. For
outdoor use, mount the CompactRIO system in a suitably rated
enclosure. Refer to the installation instructions for the chassis you
are using for more information about meeting these specifications.
Operating temperature ......................–40 to 70 °C
Storage temperature..........................–40 to 85 °C
Ingress protection..............................IP 40
Operating humidity...........................10 to 90% RH,
noncondensing
Storage humidity...............................5 to 95% RH,
noncondensing
Maximum altitude.............................2,000 m
Pollution Degree (IEC 60664)..........2
Shock and Vibration
To meet these specifications, you must panel mount the
CompactRIO system.
Operating vibration,
random (IEC 60068-2-64) ................5 grms, 10 to 500 Hz
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Operating shock
(IEC 60068-2-27)..............................30 g, 11 ms half sine,
50 g, 3 ms half sine,
18 shocks at 6 orientations
Operating vibration,
sinusoidal (IEC 60068-2-6) ..............5 g, 10 to 500 Hz
Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electical equipment for measurement,
control, and laboratory use:
•
•
•
EN 61326 EMC requirements; Minimum Immunity
EN 55011 Emissions; Group 1, Class A
CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
Note For EMC compliance, operate this device with
shielded cabling.
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CE Compliance
This product meets the essential requirements of applicable
European Directives, as amended for CE marking, as follows:
•
•
2006/95/EC; Low-Voltage Directive (safety)
2004/108/EC; Electromagnetic Compatibility Directive
(EMC)
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/certification, search by model number or
product line, and click the appropriate link in the
Certification column.
Environmental Management
National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also to NI customers.
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For additional environmental information, refer to the NI and the
Environment 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.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of their life cycle, all products
must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit ni.com/
environment/weee.htm.
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National Instruments Contact Information
National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at ni.com/support
and follow the calling instructions or dial 512 795 8248. For
telephone support outside the United States, contact your local
branch office:
Australia 1800 300 800, Austria 43 662 457990-0,
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 5050 9800,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,
Germany 49 89 7413130, India 91 80 41190000,
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,
Norway 47 (0) 66 90 76 60, Poland 48 22 3390150,
Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,
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South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545
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