Chapter 3 Developing YourApplication
© National Instruments Corporation 3-7 NI-DNET User Manual
Figure 3-1. General Programming Steps for an NI-DNET Application
1. Open Interface object
2. Open all I/O and Explicit Messaging (EM)
objects required for your application
3. Call ncSetDriverAttr, if needed
Start communication
Your DeviceNet Application:
• Write output data
• Wait for available input data
• Read input data
• Get or Set DeviceNet Attribute
• Open/Close any new I/O or EM
connection if the interface PollMode
is not equal to NC_POLL_AUTO
Stop communication
Yes
No
1. Close I/O and EM objects.
2. Close the Interface object.
Start
End
Finished?