National-instruments NI-DNET Instrukcja Użytkownika Pobierz pdf (Strona 31)

Chapter 3 Developing Your Application

NI-DNET User Manual 3-12 ni.com

Your application code should check the status returned from every

NI-DNET function. If an error is detected, you should close all NI-DNET

handles, then exit the application. If a warning is detected, you can display

a message for debugging purposes, or simply ignore the warning.

For more information on status checking, refer to the

ncStatusToString

function in the NI-DNET Programmer Reference Manual.

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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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