Rockwell Automation Publication 1766-UM001I-EN-P - June 2015 307
MicroLogix 1400 Distributed Network Protocol (DNP3) Appendix F
In the MicroLogix 1400 Series B 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.
Reporting Event By Polled Response
When a DNP3 Master sends a poll to read Class events, any events logged to the
event buffer will be 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.
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