National Instruments NI 9852 Manuale utente

NI-9852

Getting Started

2022-10-25

Contents

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Wiring the NI 9852. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

CAN Bus Topology and Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Connecting a CAN Bus to the NI 9852. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Cabling Requirements for the NI 9852. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Cable Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Determining the Necessary Termination Resistance for the Board. . . . . . . . . . . . 7

Number of CAN Nodes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

NI 9852 Hardware Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

NI 9852 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Low-Speed/Fault Tolerant CAN Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Physical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Safety Compliance and Hazardous Locations Standards. . . . . . . . . . . . . . . . . . . 10

Electromagnetic Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

CE Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Product Certifications and Declarations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Shock and Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Environmental Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

EU and UK Customers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

电子信息产品污染控制管理办法（中国 RoHS）. . . . . . . . . . . . . . . . . . . . . . . . 12

NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

ni.com

NI-9852 Getting Started

Overview

This document explains how to connect to the NI 9852.

Note Before you begin, read the NI 9852 Safety, Environmental, and

Regulatory Information document on ni.com/manuals and complete the

soware and hardware installation procedures in your chassis

documentation.

Note The guidelines in this document are specific to the NI 9852. 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

Caution Observe all instructions and cautions in the user

documentation. Using the product in a manner not specified can damage

the product and compromise the built-in safety protection.

Attention Suivez toutes les instructions et respectez toutes les mises

en garde de la documentation d'utilisation. L'utilisation du produit de

toute autre façon que celle spécifiée risque de l'endommager et de

compromettre la protection de sécurité intégrée.

Safety Guidelines for Hazardous Locations

The NI 9852 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 9852 in a potentially explosive environment. Not following these guidelines may

result in serious injury or death.

NI-9852 Getting Started

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, 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 9852 has been evaluated as Ex nA IIC T4 Gc equipment under

DEMKO 03ATEX 0626664X and is IECEx UL 14.0089X certified. Each NI 9852 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 9852 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 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.

ni.com

NI-9852 Getting Started

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 9852

The NI 9852 has two 9-pin male D-Sub connectors that provides connections to a

CAN bus. Each port on the NI 9852 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 isolated 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.

Both of the ports on the NI 9852 require an external power supply of +8 to +25 V to

operate. Supply power from the CAN bus to the VSUP0 pin on CAN0, and the VSUP1

pin on CAN1.

Pinouts for CAN0 and CAN1 of the NI 9852 are listed in Tables 1 and 2.

Connector Pin Signal

1 No Connection (NC)

2 CAN_L

3 COM0

4 NC

5 SHLD

6 COM0

7 CAN_H

8 NC

9 VSUP0

Table 1. Pin Assignments for CAN0

NI-9852 Getting Started

Connector Pin Signal

1 No Connection (NC)

2 CAN_L

3 COM0

4 NC

5 SHLD

6 COM0

7 CAN_H

8 NC

9 VSUP0

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. 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

Connecting a CAN Bus to the NI 9852

You can connect each port of the NI 9852 to any location on a CAN bus. Figure 2

shows one example of connecting CAN0 of the NI 9852 directly to one CAN node,

and CAN1 directly to another CAN node. CAN0 and CAN1 require an external power

supply on the CAN bus.

ni.com

NI-9852 Getting Started

Figure 2. Connecting Both Ports of the NI 9852 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

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

Table 3. ISO 11898 Specifications for Characteristics of a CAN_H and CAN_L Pair of Wires

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 Philips 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. Philips 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 9852 is set through the

NI 985x soware 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-9852 Getting Started

NI 9852 Hardware Overview

The NI 9852 has two full-featured, independent CAN ports that are isolated from

each other, and from the other modules in the system. Each port on the NI 9852 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 TJA1054A 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 9852 Hardware Overview

NI 9852 Specifications

The following specifications are typical for the range -40 °C to 70 °C unless otherwise

noted.

Low-Speed/Fault Tolerant CAN Characteristics

Transceiver Philips TJA1054A

Max baud rate 125 Kbps

CAN_H, CAN_L bus lines voltage -27 to +40 VDC

Supply voltage range (VSUP0/VSUP1)

CAN0 +8 to +36 VDC

CAN1 +8 to +36 VDC

RRTH 1.11 kΩ ± 0.5% or 4.99 kΩ ± 0.5%

RRTL 1.11 kΩ ± 0.5% or 4.99 kΩ ± 0.5%

MTBF 1,052,836 hours at 25 °C; Bellcore Issue 6, Method 1, Case 3,

Limited Part Stress Method

ni.com

NI-9852 Getting Started

Note Contact NI for Bellcore MTBF specifications at other temperatures

or for MIL-HDBK-217F specifications.

Power Requirements

Power consumption from chassis

Active Mode

Transmitting 400 mW max

Receiving 400 mW max

Sleep mode 25 µW max

Thermal dissipation (at 70 °C)

Active mode 1.5 W max

Sleep mode 1.2 W max

Physical Characteristics

Dimensions Visit ni.com/dimensions and search by module number.

Weight Approximately 144 g (5.0 oz)

Safety Voltages

Connect only voltages that are within the following limits:

Maximum Voltage[1]

Port-to-COM -27 V DC to +40 V DC maximum, Measurement Category I

External power supply (Vsup)

Isolation

Port-to-port

NI-9852 Getting Started

Continuous 60 V DC, Measurement Category I up to 5,000 m altitude

Withstand 500 V RMS, verified by a 5 s dielectric withstand test

Port-to-earth ground

Continuous 60 V DC, Measurement Category I up to 5,000 m altitude

Withstand 500 V RMS, verified by a 5 s dielectric withstand test

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.

Safety Compliance 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 C22.2 No. 61010-1

■EN 60079-0, EN 60079-7

■IEC 60079-0, IEC 60079-7

■UL 60079-0, UL 60079-7

■CSA C22.2 No. 60079-0, CSA C22.2 No. 60079-7

Note For safety certifications, refer to the product label or the Product

Certifications and Declarations section.

Hazardous Locations

U.S. (UL) Class I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, AEx nA IIC T4 Gc

Canada (C-UL) Class I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, Ex nA IIC T4 Gc

Europe (DEMKO) Ex nA IIC T4 Gc

ni.com

NI-9852 Getting Started

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