National Instruments NI-DNET B

© National Instruments Corporation B-1 NI-DNET User Manual

B

Cabling Requirements

This appendix describes the cabling requirements for the hardware.

Cables should be constructed to meet these requirements as well as the

requirements of DeviceNet. DeviceNet cabling requirements can be found

in the DeviceNet Specification.

Connector Pinouts

The PCI-CAN, PXI-8461, and the PCMCIA-CAN bus-powered cable each

have a Combicon-style pluggable screw terminal connector. The

PCMCIA-CAN bus-powered cable also has a DB-9 D-SUB connector.

The 5-pin Combicon-style pluggable screw terminal follows the pinout

required by the DeviceNet Specification. FigureB-1 shows the pinout for

this connector.

Figure B-1. Pinout for 5-Pin Combicon-Style Pluggable Screw Terminal

CAN_H and CAN_L are signal lines that carry the data on the DeviceNet

network. These signals should be connected using twisted-pair cable.

The V+ and V– signals supply power to the DeviceNet physical layer. Refer

to the Power Supply Information for the DeviceNet Ports section for more

information.

1V+

2CAN_H

3Shield

4CAN_L

5V–

12

3

5

4

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Contents Chapter 4 NI-DNET Programming Techniques Appendix A DeviceNet Overview Page About This Manual How to Use the Manual Set Conventions Related Documentation Page NI-DNET Software Overview Installation and Configuration Measurement & Automation Explorer (MAX) Verify Installation of Your DeviceNet Hardware Page Configure DeviceNet Port Change Protocol LabVIEW Real-Time (RT) Configuration Tool s NI-Spy NI-DNET Objects Interface Object Explicit Messaging Object I/O Object Example Using NI-CAN with NI-DNET Page NI-DNET Hardware Overview Types of Hardware Differences Between CAN Kits and DeviceNet Kits Developing Your Application Accessing NI-DNET from your Programming Environment LabVIEW LabWindows/CVI Microsoft Visual Basic Microsoft C/C++ Borland C/C++ Other Programming Languages Page Programming Model for NI-DNET Applications Figure 3-1. General Programming Steps for an NI-DNET Application Step 1. Open Objects Step 2. Start Communication Step 3. Run Your DeviceNet Application Addition of Slave Connections after Communication Start Step 4. Stop Communication Step 5. Close Objects Multiple Applications on the Same Interface Checking Status in LabVIEW Checking Status in C, C++, and Visual Basic Page NI-DNET Programming Techniques Configuring I/O Connections Expected Packet Rate Strobed I/O Polled I/O Scanned Polling Background Polling Individual Polling Cyclic I/O Change-of-State (COS) I/O Automatic EPR Feature Using I/O Data in Your Application Page Accessing I/O Members in LabVIEW Accessing I/O Members in C Using Explicit Messaging Services Get and Set Attributes in a Remote DeviceNet Device Other Explicit Messaging Services Handling Multiple Devices Configuration Object Handles Main Loop A DeviceNet Overview History of DeviceNet Physical Characteristics of DeviceNet General Object Modeling Concepts Object Modeling in the DeviceNet Specification Page Explicit Messaging Connections Page I/O Connections Polled I/O Bit Strobed I/O Change-of-State and Cyclic I/O Page Assembly Objects Page Device Profiles Open DeviceNet Vendors Association (ODVA) B Cabling Requirements Connector Pinouts Page Power Supply Information for the DeviceNet Ports Page Page Cable Specifications Cable Lengths Maximum Number of Devices Cable Termination Cabling Example FigureB -8 shows an example of a cable to connect two DeviceNet devices. Figure B-8. Cabling Example C Troubleshooting and Common Questions Troubleshooting with the Measurement & Automation Explorer (MAX) Missing CAN Card Troubleshooting Self Test Failures Application In Use Memory Resource Conflict Interrupt Resource Conflict NI-CAN Software Problem Encountered Common Questions Page D Hardware Specifications PCI-CAN Series PCMCIA-CAN Series PXI-CAN Series Port Characteristics Safety Electromagnetic Compatibility CE Compliance E Technical Support and Professional Services Glossary A B C D E F Page N O P R S V Index C D E H L M N P R