National Instruments NI-DNET

Appendix B Cabling Requirements

Figure B-6. PXI-8461 Parts Locator Diagram

Connecting pins 1 and 2 of a jumper configures the PXI-8461 physical

layer to be powered externally (from the bus cable power). In this

configuration, the power must be supplied on the V+ and V– pins on the

port connector. The jumper must be in this position for the DeviceNet

interface to be compliant with the DeviceNet Specification.

Connecting pins 2 and 3 of a jumper configures the PXI-8461 physical

layer to be powered internally (from the board). In this configuration, the

V– signal serves as the reference ground for the isolated signals.

The PCMCIA-CAN is shipped with the bus power version of the

PCMCIA-CAN cable. An internally-powered version of the

PCMCIA-CAN cable can be ordered from National Instruments.

1 Power Supply Jumper J6

2 Power Supply Jumper J5

3 Assembly Number

4 Product Name

5 Serial Number

3 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