NI NI-9853 Manuale utente
NI-9853
2022-07-06
Contents
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
EMC Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cable Requirements for EMC Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring the NI-9853. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CAN Bus Topology and Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connecting a CAN Bus to the NI-9853. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cabling Requirements for the NI 9853. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cable Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Termination Resistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cable Lengths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Number of CAN Nodes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
NI-9853 Hardware Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
NI-9853 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
High-Speed CAN Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Physical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Safety and Hazardous Locations Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electromagnetic Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CE Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Online Product Certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Shock and Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Environmental Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Waste Electrical and Electronic Equipment (WEEE). . . . . . . . . . . . . . . . . . . . . . . . 15
电子信息产品污染控制管理办法（中国 RoHS）. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Worldwide Support and Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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NI-9853
Overview
This document explains how to connect to the NI-9853.
The NI-9853 module requires the latest NI 985x soware to be installed. The latest
version of the NI 985x soware is at ni.com/downloads.
Note Before you begin, complete the soware and hardware installation
procedures in your chassis documentation.
Note The guidelines in this document are specific to the NI-9853. 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-9853 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.
Caution Do not operate the NI-9853 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-9853 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
© National Instruments 3
NI-9853
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 o or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched o 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 IP54 as defined by IEC/EN 60079-15.
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 Hazardous Locations Use in Europe and
Internationally
The NI-9853 has been evaluated as Ex nA IIC T4 Gc equipment under DEMKO
Certificate No. 03 ATEX 0324020X and is IECEx 14.0089X certified. Each NI-9853 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-9853 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.
Caution You must make sure that transient disturbances do not exceed
140% of the rated voltage.
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NI-9853
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.
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.
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 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 NI could void your authority to operate it under your local regulatory rules.
Notice To ensure the specified EMC performance for the NI-9853, you
must install clamp-on ferrite beads (NI part number 711849-01) in
accordance with the product installation instructions. Refer to the NI-9853
product page on ni.com for purchasing information about clamp-on ferrite
beads.
© National Instruments 5
NI-9853
Cable Requirements for EMC Compliance
Select and install cables for the NI-9853 in accordance with the following
requirements:
■Install a clamp-on ferrite bead (NI part number 711849-01) on each end of
the cable for each channel that you are connecting to on the NI-9853.
■Clamp-on ferrites must be connected to the cable as close to the module as
possible with a full turn as shown in the following figure. Placing the ferrite
elsewhere on the cable noticeably impairs its eectiveness.
Figure 1. Installing a Ferrite
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. Connect these signals using twisted-pair cable.
Each port has two common pins (COM) that are internally connected to the
module’s isolated reference 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 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.
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.
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NI-9853
Pinouts for CAN0 and CAN1 of the NI-9853 are listed in Tables 1 and 2.
Table 4 lists recommended termination resistor values.
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 NC
Table 1. Pin Assignments for CAN0
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
Table 2. Pin Assignments for CAN1
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.
© National Instruments 7
NI-9853
However, this requirement does not mean that every node on the bus should have a
termination resistor; only the two nodes at the far 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.
Figure 2. CAN Bus Topology and Termination Resistor Locations
CAN
Node
CAN
Node
CAN
Node
RtRt
CAN
Node
CAN_H
CAN_L
CAN_H
CAN_L
CAN_H
CAN_L
CAN_H
CAN_L
Bus Cable Length
Stub
Length
Connecting a CAN Bus to the NI-9853
You can connect each port of the NI-9853 to any location on a CAN bus. Figure 2
shows one example of connecting 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.
Figure 3. Connecting Both Ports of the NI-9853 to CAN Buses
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.
Characteristic Value
Impedance 95 Ω min,
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NI-9853
Characteristic Value
120 Ω nominal,
140 Ω max
Length-related resistance 70 mΩ/m nominal
Specific line delay 5 ns/m nominal
Table 3. ISO 11898 Specifications for Characteristics of a CAN_H and CAN_L Pair of Wires
Termination Resistors
The termination resistors (Rt) should match the nominal impedance of the CAN
cable and therefore comply with the values in the following table.
Characteristic Value Condition
Termination resistor, Rt100 Ω min, Minimum power dissipation: 220 mW
120 Ω nominal,
130 Ω max
Table 4. Termination Resistor Specification
Cable Lengths
The cabling characteristics and desired bit transmission rates aect the allowable
cable length. You can find detailed cable length recommendations 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 you should analyze each node for
signal integrity problems.
Number of CAN Nodes
The maximum number of nodes depends on the electrical characteristics of the
nodes on the network. If all nodes meet the ISO 11898 requirements, you can
connect at least 30 nodes to the bus. You can connect higher numbers of nodes if
the nodes’ electrical characteristics do not degrade signal quality below ISO 11898
signal level specifications.
The NI-9853 electrical characteristics allow at least 110 CAN ports on a network.
© National Instruments 9
NI-9853
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 or the NI-9853 has
a Philips SJA1000 controller that is CAN 2.0B-compatible and fully supports both 11-
bit and 29-bit identifiers. The port also has a Philips TJA 1041 High-Speed CAN
transceiver that is fully compatible with the ISO 11898 standard and supports baud
rates up to 1 Mbps.
Figure 4. NI-9853 Hardware Overview
NI-9853 Specifications
The following specifications are typical for the range -40 °C to 70 °C unless otherwise
noted.
High-Speed CAN Characteristics
Transceiver Philips TJA 1041
Max baud rate 1 Mbps
CAN_H, CAN_L bus lines voltage -27 to +40 VDC
Supply voltage range (VSUP)
CAN1 +9 to +30 VDC
CAN0 N/A
MTBF 1,816,913 hours at 25 °C; Bellcore Issue 6, Method 1, Case 3,
Limited Part Stress Method
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NI-9853
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