National-instruments NI-DNET Manual do Utilizador Página 11
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Chapter 1 NI-DNET Software Overview
NI-DNET User Manual 1-2 ni.com
Figure 1-1. NI-DNET Cards Listed in MAX
Note
Each card’s name uses the word CAN, because the Controller Area Network is the
communication protocol upon which DeviceNet is built.
If your NI DeviceNet hardware is not listed here, MAX is not configured
to search for new devices on startup. To search for the new hardware,
press <F5>.
To verify installation of your DeviceNet hardware, right-click the
DeviceNet card, then select Self-test. If the self-test passes, the card icon
shows a checkmark. If the self-test fails, the card icon shows an X mark, and
the Test Status in the right pane describes the problem. Refer to
Appendix C, Troubleshooting and Common Questions, for information
about resolving hardware installation problems.
- DeviceNet 1
- Important Information 3
- Contents 4
- Chapter 4 5
- Appendix A 5
- About This Manual 7
- Conventions 8
- Related Documentation 8
- • LabVIEW online reference 9
- • ODVA website 9
- NI-DNET Software Overview 10
- Configure DeviceNet Port 12
- Change Protocol 12
- NI-DNET Objects 13
- Interface Object 14
- Explicit Messaging Object 14
- I/O Object 15
- Using NI-CAN with NI-DNET 16
- NI-DNET Hardware Overview 18
- Developing Your Application 20
- LabWindows/CVI 21
- Microsoft Visual Basic 21
- Microsoft C/C++ 22
- Borland C/C++ 22
- Other Programming Languages 23
- Finished? 26
- Step 1. Open Objects 27
- Step 2. Start Communication 27
- Communication Start 28
- Step 4. Stop Communication 29
- Step 5. Close Objects 29
- Checking Status in LabVIEW 30
- NI-DNET Programming 32
- Techniques 32
- Strobed I/O 33
- Polled I/O 34
- Background Polling 35
- Individual Polling 36
- Cyclic I/O 37
- Change-of-State (COS) I/O 38
- Automatic EPR Feature 38
- Accessing I/O Members in C 42
- Handling Multiple Devices 45
- Object Handles 46
- Main Loop 47
- DeviceNet Overview 48
- Appendix A DeviceNet Overview 49
- I/O Connections 54
- Bit Strobed I/O 55
- Assembly Objects 58
- Device Profiles 60
- Cabling Requirements 61
- Cable Specifications 66
- Cable Lengths 66
- Maximum Number of Devices 66
- Cable Termination 67
- Cabling Example 68
- Troubleshooting and 69
- Common Questions 69
- Application In Use 70
- Memory Resource Conflict 70
- Interrupt Resource Conflict 70
- Hardware Specifications 73
- PXI-CAN Series 74
- Port Characteristics 75
- Electromagnetic Compatibility 75
- CE Compliance 76
- Technical Support and 77
- Professional Services 77
- Glossary 78
- D0000 to D1FFF hex) 83
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