Rockwell Automation 1766-Lxxxx MicroLogix 1400 Programmable Controllers User Manual - Manual (Page 306)

266 Rockwell Automation Publication 1766-UM001H-EN-P - May 2014
Appendix F MicroLogix 1400 Distributed Network Protocol (DNP3)
Data Set Descriptors Configuration Parameters
These parameters are used to construct Data Set Descriptors objects.
Number of Descriptor Elements: 0…10. This must be the same as the number of
the Descriptor elements that are configured.
Characteristics: Used to assign characteristics to this Descriptor.
• RD - set if data set is readable.
• ST - set if outstation maintains a static data set.
• EV - set if outstation generates a data set event.
Event Class - Used to assign Event Class to this Descriptor.
• 0 - None
• 1 - Class 1
• 2 - Class 2
• 3 - Class 3
Trigger Event: Set this parameter to generate an event unconditionally. This bit
can also be set by the ladder logic to generate timed events. Once this parameter is
set by the ladder logic or communications, the MicroLogix 1400 clears it
automatically after generating an event at the end of scan. This parameter is
stored as a bit in the relevant Data Set Descriptor Config file and the bit can be
accessed by Nx:2/4 where x is the relevant Data Set Descriptor Config file
number.