Rockwell Automation 1761-NET-DNI DeviceNet Interface (DNI) - Manual (Page 49)

Publication 1761-UM005B-EN-P - October 2006
DNI Configuration Parameters and Programming Notes 49
DNI Mode
This parameter defines the mode of the DNI. You must set this mode
to Standby (0) when you want to change a number of DNI
parameters. Once you have made the necessary changes, set this
value to Operational (1).
Programming Notes Input Messaging
The DNI is capable of accepting an unsolicited Input Data Message
from the DF1 device. This capability allows the controller to update
the DNI’s input data whenever it detects a change in its input data.
With this capability, a user can increase the value of the data scan
delay; this reduces the amount of communications traffic over the
RS-232/DF1 port, but still maintains very high I/O throughput
performance.
To utilize this feature, simply program a message instruction in the
controller with a destination address of 254. The DNI accepts the
message and when it sees the 254 address (which is invalid on
DeviceNet), it recognizes that the message is input data. All data
received by message instruction with address 254 is automatically
routed to the DNI’s input data area.
See the application example MicroLogix as I/O on the DeviceNet
Network on page 69 for more information about input messaging.
DNI Mode Parameter Definition
Parameter
Type Parameter Number Description Range Default Value
Series A Series B
Device 17 n/a DNI Mode Standby (0) or
Operational (1) Operational (1)
IMPORTANT
The DNI Mode parameter only applies to DNI Series
A. For DNI Series B, the operating mode is controlled
by the I/O Scan Enable parameter.