Allen-Bradley 1404-M4, User Manual

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Publication 1404-UM001D-EN-E - October 2004
Data Logging 7-5
Reading Data from the Event Log Using Communications
The Event Log uses the indexed read method. Table A.26 is the
Read-back Select table and Table A.27 is the Results table. You may
select among a number of read-back options for the Event Log:
0 = Auto-increment / start at beginning of log
1 = Auto-increment / start at end of log
2 = Auto-decrement / start at end of log
3 = Point to the beginning of log
4 = Point to the end of log
5 = Index to the next record
6 = Index to the previous record
Indexing occurs after each read of the Results table.
Only mode 0, 1 and 2 are supported by DF1 and Remote I/O
communications.
Table A.27 is a read-only data table containing 14 (M4, M5), 17 (M6)
or 18 (M8 only) integer elements as follows:
•
Reserved: returns 0
•
Event record internal identifier: An incremental number
assigned to each new event. See below
•
Timestamp: event timestamp expressed in four-element
timestamp format (see below)
•
Event type: see Table 7.1
•
Event command code: see Table 7.1 and Table 7.2
•
Setpoint type, evaluation condition, level, action/release delay,
and action:
if event is a setpoint, these elements return
additional information about the setpoint. The Setpoint level ,
expressed in integer/exponent format, records the worst-case
value of the setpoint parameter
•
Sustain limit timer (M6, M8 only): time the setpoint parameter
exceeded the limit, expressed in integer/exponent format
•
Capture identifier (M6, M8 only): identifies oscillograph or
transient capture number if applicable
•
Event text available (M8 only): 0 indicates no user comment; 1
indicates a user comment has been stored in the current record
(see below)
Allen-Bradley HMIs