National Instruments NI 9852 Bedienungsanleitung

OPERATING INSTRUCTIONS

NI 9852

2-Port, Low-Speed/Fault-Tolerant CAN Module

NI 9852 Operating Instructions 2 ni.com

These operating instructions describe how to use the National

Instruments (NI) 9852 module. For information about installing,

configuring, and programming your system, refer to your system

documentation. The NI 9852 module requires the NI 985xsoftware

(version 1.2 or higher) to be installed. The latest version of the

NI 985xsoftware is located at ni.com/downloads.

Note The safety guidelines and specifications in this

document are specific to the NI 9852. The other

components in your system may not meet the same safety

ratings and specifications. Refer to the documentation for

each component in your system to determine the safety

ratings and specifications for the entire system.

Safety Guidelines

Operate the NI 9852 only as described in these operating

instructions.

Hot Surface This icon denotes that the component may be

hot. Touching this component may result in bodily injury.

Safety Guidelines for Hazardous Locations

The NI 9852 is suitable for use in Class I, Division 2, Groups A, B,

C, D, and T4 hazardous locations; Class 1, 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 9852 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.

NI 9852 Operating Instructions 4 ni.com

Caution For Zone 2 applications, install a protection

device between the CAN signals and the NI 9852 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

This equipment has been evaluated as EEx nA II T4 equipment

under DEMKO Certificate No. 03 ATEX 0324020X. Each module

is marked II 3G and is suitable for use in Zone 2 hazardous

locations.

Wiring the NI 9852

The NI 9852 has two 9-pin male D-Sub connectors that provide

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.

These signals should be connected using twisted-pair cable.

Each port has two isolated 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. Connect the CAN bus

reference ground (sometimes referred to as CAN_V–) to the COM

pin. 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.

Both of the ports on the NI 9852 require an external power supply

of +8 V to +36 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 Table 1

and Table 2.

NI 9852 Operating Instructions 6 ni.com

Table 1. Pin Assignments for CAN0

Connector Pin Signal

1No Connection (NC)

2CAN_L

3COM0

4NC

5SHLD

6COM0

7CAN_H

8NC

9 VSUP0

Table 2. Pin Assignments for CAN1

Connector Pin Signal

1No Connection (NC)

2CAN_L

3COM1

4NC

5SHLD

6COM1

7CAN_H

8NC

9 VSUP1

NI 9852 Operating Instructions 8 ni.com

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

Each port of the NI 9852 can be connected to any location on a

CAN bus. Figure 2 shows one example of the connection of 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.

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

NI 9852 Operating Instructions 10 ni.com

Figure 2. Connecting Both Ports of the NI 9852 to CAN Buses

CAN1

CAN Device

CAN0

NI 9852

CAN

Cable

(With

Optional

Shield)

(SHLD)

CAN_H

CAN_L

Vsup1

COM1

(SHLD)

CAN_H

CAN_L

Vsup1

COM1

CAN Device

CAN

Cable

(With

Optional

Shield)

(SHLD)

CAN_H

CAN_L

Vsup0

COM0

(SHLD)

CAN_H

CAN_L

Vsup0

COM0

–

External

Power

Supply

–

External

Power

Supply

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