252 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Appendix F MicroLogix 1400 Distributed Network Protocol
In MicroLogix 1400 Series B and Series C controllers, new configuration files
are defined for the Deadband for Analog Input Objects and the Threshold for
Counter Objects. The feature of the configuration files replaces the ladder
program in this section.
Report Event By Polled Response
When a DNP3 Master sends a poll to read Class events, any events logged to the
event buffer are reported in the polled response.
When using both Channel 0 and Channel 2 Serial ports for DNP3
communication, event polling requests should be sent to one Channel at a
time. This avoids mis-reporting of events to different DNP3 Masters on
different Channels. For example, Master A and Master B are connected to
Channel 0 and Channel 2 respectively, and 5000 events are logged in the event
buffer. Master A sends an event polling request, and only 50 events can be fit in
an application layer fragment. The first 50 events are sent to Master A and the
next 50 events may be sent to Master B instead.
Report Event By Unsolicited Response
To initiate and send Unsolicited Responses to a DNP3 Master, the parameters
below should be configured correctly. For more details, see DNP3 Slave
Application Layer Configuration Parameters on page 198.
•Master Node 0
• Channel for Unsolicited Response
• Enable Unsolicited On Start Up
• Enable Unsolicited For Class1
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