National Instruments NI-DNET

Glossary

NI-DNET User Manual G-4 ni.com

hex Hexadecimal

Hz Hertz

I/O connection Connection used for exchange of physical input/output (sensor/activator)

data, as well as other control-oriented data.

in. inches

individual polling A polledI/O communication scheme in which each polled slave

communicates at its own individual rate.

instance A specific instance of a given class. For example, a blue square of 4 inches

per side would be one instance of the class Squares.

ISO International Standards Organization

KB Kilobytes of memory

LabVIEW Laboratory Virtual Instrument Engineering Workbench

LED light-emitting diode

local Within NI-DNET, anything that exists on the same host (personal

computer) as the NI-DNET driver.

m meter

MAC ID Media access control layer identifier. In DeviceNet, a device’s MAC ID

represents its address on the DeviceNet network.

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