1761-6.5
3-2
Operation
Input Image
The input image is a configurable array of 16-bit data words. The image is
configurable from 1 to 16 data words for DNI Series A (1 to 32 data words
for DNI Series B). The actual data that resides in the input image is
delivered to the DeviceNet master by one of three mechanisms:
•
Polled: Where the DeviceNet Master sends a poll request with output
data and the DNI responds with its current input data.
•
COS (Change Of State): Where the DNI detects that data has changed
within the input image and automatically sends the data to the DeviceNet
Master.
•
Cyclic: The DNI continuously sends the input image data to the master
at a user/scanner-defined time interval, regardless of whether the data has
changed.
Output Image
The output image is a configurable array of 16-bit data words. The image is
configurable from 1 to 16 data words for DNI Series A (1 to 32 data words
for DNI Series B). The actual data that resides in the output image is
delivered to the DNI from the master by one of two mechanisms:
•
Polled: Where the DeviceNet Master sends a poll request with output
data and the DNI responds with its current input data.
•
COS (Change Of State): Where the DeviceNet Master detects that data
has changed within its output image and automatically sends the data to
the DNI.
•
Cyclic:
The DNI continuously receives the output image data from the
master at a user/scanner-defined time interval, regardless of whether the
data has changed.
Network Configuration
Software
All DNI I/O parameters are configured with software (such as the DNI
Configuration Utility, RSNetWorx, or DeviceNet Manager) and stored as
part of the network configuration. Configuration software is covered in
"Setup, Programming, and Troubleshooting" on page 6-1, and the
individual settings of the DNI are covered in "DNI Configuration
Parameters and Programming Notes" on page 5-1 of this manual.
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