Technical data
Audit log time stamps (continued)Table 5-19:
Sequence Number Date Time
128 5/22/2014 12:24:20 PM
129 5/22/2014 12:45:06 PM
130 5/22/2014 1:00:55 PM
131 5/22/2014 1:00:55 PM
132 5/22/2014 1:00:55 PM
133 5/22/2014 1:00:55 PM
134 5/22/2014 1:00:55 PM
135 5/22/2014 1:02:17 PM
136 5/22/2014 1:03:20 PM
137 5/22/2014 1:03:25 PM
5.2 Event log: alarm/audit
The meter monitors several data points with respect to each point’s alarm limit(s). Non-
boolean data points can have low and high alarm limits. Boolean data points only have a
single alarm limit (i.e., either TRUE or FALSE). There are two statuses associated with
alarms: set and cleared. An alarm is set when the data point is at or exceeds its alarm limit.
An alarm is cleared when the data point is within its alarm limit(s).
The Daniel 3810 Series Liquid Ultrasonic Flow Meter stores an alarm log record whenever
any monitored data point’s alarm status (cleared or set) changes. The alarm log record
indicates the data point, date and time, alarm status, corresponding alarm limit, and data
point value.
The meter can store up to 3000 alarm records. The user can select whether old, unread
records can be overwritten by new records when the log becomes full via the data point
DoOverwriteUnreadAlarmLog. This point can be modified using the Daniel MeterLink Tools|
Edit/Compare Configuration screen. The default is to overwrite old, unread records. Refer to
Section 5.2.5 for information on reading records and marking records as read. The data
point IsAlarmLogFull indicates whether or not the alarm log is full and cannot overwrite
old, unread records.
The user-settable data points AlarmTurnOffHysterisisCount and
AlarmTurnOffHysterisisTimeSpan are used to prevent very repetitive alarms from filling up
the alarm log. When an alarm is set AlarmTurnOffHysterisisCount times within
AlarmTurnOffHysteresisTimeSpan seconds, then the alarm is suppressed until the alarm
frequency drops below the specified rate (counts per time span) at which point the next
alarm clearing “unsuppresses” the alarm. The alarm log records indicate when an alarm
suppression is started and ended. The default values are 8 occurrences in 240 seconds.
Archive logs and reports
82 Daniel 3810 Series Operations Manual