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National-instruments NI-DNET Manual de usuario Pagina 9
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About This Manual
©
National Instruments Corpor
ation
xi
NI-DNET User Manual
•
LabVIEW online reference
•
OD
V
A website,
www.odva.org
•
Microsoft W
in32 Software Dev
elopment Kit (SDK) onlin
e help
1
2
3
4
5
6
7
8
9
10
11
12
13
14
...
85
86
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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