Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 247
Appendix F          MicroLogix 1400 Distributed Network Protocol
Event Reporting This section covers how to generate DNP3 events from DNP3 Data Objects and 
how to report the generated events by polled response or unsolicited response.
Generate Events
The controller has a separate buffer area that you can use to log DNP3 events 
internally.
The maximum number of the Events that can be logged is 6013 or 10000 (see 
DNP3 10K Event Logging on page 250), regardless of the Event data type. With 
Series B and Series C controllers, a Data-Set event can consume multiple 
numbers of the event buffers.
If the number of the generated events reaches this value, the controller sets 
IIN2.3 [EVENT_BUFFER_OVERFLOW]. Further events are not logged until 
the logged events are reported to DNP3 Master and the buffer is available.
The elements CS0:67 or CS2:67 in the Communication status file show how 
many events are logged to the event buffer. The logged events are not removed 
until they are reported to DNP3 Master successfully. Logged event can also be 
cleared when one of the following events occur:
• New OS firmware upgrade
• New user program download.
Figure 74
 shows how to generate events for a Binary Input Object and a 16-bit 
Analog Input Object. In the DNP3 Slave configuration, Binary Input Object 
Data File Number is configured to 10 and its Configuration File Number is 
250 Read Only VSTR
length of the 
string value
length of the 
string value
Device manufacturer's product 
name and model
This variation returns 
Catalog Number and OS 
Series of the controller. 
1766-L32BWA SER A. 
This variation returns 
Catalog Number and OS 
Series of the controller. 
1766-L32BWA SER B. 
Supported ranges: 1766-L32xxxa SER y where xxxa is 
BWA, AWA, BXB, BWAA, AWAA, or BXBA and y is A ~ F.
For example, 1766-L32BWA SER A, 1766-L32AWA SER 
B, 1766-L32BXB SER C, or 1766-L32BWAA SER A.
251 - - - - Reserved for future assignment - -
252 Read Only VSTR 13 19 Device manufacturer's name
This variation returns the 
Company name. Allen-
Bradley.
This variation returns the 
Company name. Rockwell 
Automation for DNP3.
253 Read Only - - - Reserved for future assignment - -
254 Read Only - - - Non-specific all attributes request
This variable returns all of the variations in this group 
except this variation.
255 Read Only - - - List of attribute variations
This variation returns the R/W property for each 
variation. From g0v211…g0v253.
0 for Read Only
1 for Read or Write
Object Group 0, Variations for Attribute Set 0 (Continued)
Variation Read /Write
Attribute 
Data Type
Length in Bytes 
(Series  A)
Max Length in 
Bytes (Series B 
and Series C)
Description Value (Series A) Value (Series B)