Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 413
CIP Objects Appendix A
Table 142 - Buffer Event Types
Worked Example of Event Decoding
Each event log entry is a 16 byte record consisting of a number of sub
structures: Example hex data on the wire: 01 15 71F53854 9600 00 00 00 00
00 40 00 00
Table 141 - Alarm Event Types
ID Name Bytes 8...15 Application
01 Measurement Alarm Status Previous Alarm Status 8...11 * New Alarm Status 12...15
02 (OK) Voted Alarm Status Previous Alarm Status 8...11 * New Alarm Status 12...15
03 (Alert) Voted Alarm Status Previous Alarm Status 8...11 * New Alarm Status 12...15
04 (Danger) Voted Alarm Status Previous Alarm Status 8...11 * New Alarm Status 12...15
05 Special Relay Source Alarm
Status
Previous Alarm Status 8...11 * New Alarm Status 12...15
Notes
While the returned data is the same, the trigger is different in each case.
A change in the upper 16 bits (considered 'pre-alarm' data) triggers a measurement alarm status event.
A change in the overall alarm state (true or false) triggers a voted alarm status change.
The voted alarm status changes are categorized as OK, Alert, or Danger, which is based on which alarm
output they relate to (encoded as bits 14/15).
The special relay source alarm status is used where a dedicated module fail or 'inhibit active' relay has
been configured and reflects a change in status of this monitoring.
ID Name Bytes 8...15 Application
01 Trend Data-Set Status Bytes 8/9 are previous Trend Buffer status, bytes 10/11 are the new Trend
Buffer status
02 Alarm Data-Set Status Bytes 8/9 are previous Alarm Buffer status, bytes 10/11 are the new
Alarm Buffer status
03 Transient Data-Set Status Bytes 8/9 are previous Transient Buffer status, bytes 10/11 are the new
Transient Buffer status
Notes
Buffer events indicate a change in status of these buffers (example: armed to populating or population to
data ready)
Table 143 - Event Log Entries
Subsection Location Example
Event Type Byte 0 01
Event ID Byte 1 15
Event time (seconds) Bytes 2...5 5438F571
Event time (subseconds) Bytes 6...7 0096
Event Data Bytes 8...15 00 00 00 00 00 40 00 00
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