National Instruments NI 9882 Manual de usuario

OPERATING INSTRUCTIONS

NI 9882

1-Port DeviceNet Module

NI 9882 Operating Instructions 2 ni.com

These operating instructions describe how to use the National

Instruments (NI) 9882 module. For information about installing,

configuring, and programming your system, refer to your system

documentation. The NI 9882 module requires the latest

NI-DeviceNet software to be installed. The latest version of the

NI-DeviceNet software is available at ni.com/downloads.

Note The safety guidelines and specifications in this

document are specific to the NI 9882. 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 9882 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 9882 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 9882 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 9882 Operating Instructions 4 ni.com

Caution For Zone 2 applications, install a protection

device between the CAN signals and the NI 9882 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 Ex nA II T4 equipment

under DEMKO Certificate No. 07 ATEX 0626664X. Each module

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

locations.

Wiring the NI 9882

The NI 9882 has one 9-pin male D-Sub connector that provides

connections to a CAN bus. The NI 9882 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 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.

Caution You must use a UL listed ITE power supply

marked LPS with the NI 9882.

The NI 9882 requires an external power supply in the range of

+9 to +30 V to operate. Supply power to the NI 9882 VSUP pin.

Note Power on VSUP is required for DeviceNET

operation.

The NI 9882 pinout is listed in Table 1.

The NI 9882 features software-selectable bus termination for

High-Speed CAN transceivers. On the NI 9882, you can enable

120 termination resistors between CAN_H and CAN_L through

an API call. Table 3 lists recommended termination resistor values.

NI 9882 Operating Instructions 6 ni.com

Table 1. Pin Assignments for the NI 9882

Connector Pin Signal

1No Connection (NC)

2CAN_L

3COM

4NC

5SHLD

6COM

7CAN_H

8NC

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

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 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.

NI 9882 Operating Instructions 8 ni.com

Figure 1. 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 9882

You can connect the NI 9882 port to any location on a CAN bus.

Figure 2 shows one example of connecting the NI 9882 directly to

one CAN node.

Figure 2. Connecting the NI 9882 to a CAN Device

Cabling Requirements for the NI 9882

This section deals with cabling specifications, termination

resistors, cable lengths, and the number of CAN nodes that can

exist in a system.

CAN0 NI 9882

CAN Device

CAN

Cable

(With

Optional

Shield)

(SHLD)

CAN_H

CAN_L

Vsup

COM

(SHLD)

CAN_H

CAN_L

Vsup

COM

NI 9882 Operating Instructions 10 ni.com

Cable Specifications

Cables should meet the physical medium requirements specified

in ISO 11898, shown in Table 2. Belden cable (3084A) meets all

these requirements and should be suitable for most applications.

Termination Resistors

The termination resistors (Rt) should match the nominal

impedance of the CAN cable and therefore comply with the values

in Table 3. The onboard, software-selectable termination has a

nominal value of 120 . If you are not using the onboard

termination, use the values listed in Table 3.

Table 2. ISO 11898 Specifications for Characteristics of a CAN_H and

CAN_L Pair of Wires

Characteristic Value

Impedance 95 minimum, 120 nominal, 140 maximum

Length-related

resistance

70 m/m nominal

Specific line delay 5 ns/m nominal

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