6. Develop DeviceNet Applications
NI-DNET Configurator can help you develop DeviceNet applications in LabVIEW, LabWindows/CVI, C, or Basic.
The two typical DeviceNet applications are accessing a device parameter and accessing device I/O data, described in the following tables.
Accessing a Device Parameter
| Purpose | Function(s) or VI(s) | Comment |
|---|---|---|
| Configure and open an Explicit Messaging object to access parameters. | ncOpenDnetExplMsg (Open DeviceNet Explicit Messaging) | Needs the device MAC ID, which is in the DeviceNet Network window. |
| Read or write a parameter. | ncGetDnetAttribute (Get DeviceNet Attribute) and ncSetDnetAttribute (Set DeviceNet Attribute) | Needs the parameter class ID, instance ID, attribute ID, and size, which are in the Parameters tab of the Device Information window. |
| Decode or encode a parameter. | ncConvertFromDnetRead (Convert From DeviceNet Read) and ncConvertForDnetWrite (Convert For DeviceNet Write) | Needs the parameter data type, which is in the Parameters tab of the Device Information window. |
Refer to the Get Identity Attributes example for more information.
Accessing Device I/O Data
| Purpose | Function(s) or VI(s) | Comment |
|---|---|---|
| Configure and open an I/O object to access I/O data. | ncOpenDnetIO (Open DeviceNet I/O) | Needs the device MAC ID, I/O connection type, and input/output length. The MAC ID is in the DeviceNet Network window. The I/O connection type and input/output length are in the I/O Data tab of the Device Information window. |
| Read input data or write output data. | ncReadDnetIO (Read DeviceNet I/O) and ncWriteDnetIO (Write DeviceNet I/O) | Needs the input/output length, which is in the I/O Data tab of the Device Information window. |
| Decode the input data or encode the output data. | ncConvertFromDnetRead (Convert From DeviceNet Read) and ncConvertForDnetWrite (Convert For DeviceNet Write). | You can get the decode/encode hint in I/O Data»I/O Information in the Device Information window. |
Refer to the Single Device example for more information.
Refer to Configurator Main Window, Device Information Window, NI-DNET User Manual, and NI-DNET Programmer Reference Manual for more information.