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Alarm Lists (NV4W/NV3Q) Section 7-11
■ Alarm History
There are two modes of history display: Time Order (which displays triggered,
acknowledged, and recovered alarms) and Frequency Order (which displays
the number of times alarms have occurred).
■ Alarm List
A list of current alarms is displayed.
Description of Operation
1,2,3... 1. The PT constantly monitors the PLC memory.
2. When an alarm occurs, or when the system recovers from a current alarm,
the alarm number, time of the occurrence, and time of the recovery are re-
corded in internal memory of the PT.
3. Alarm data stored in internal memory is displayed by the alarm list part.
4. Alarm check data is written into internal memory of the PT using the alarm
list and the function switch. (To record the data, select the alarm to be
checked and press the function switch for which the operation mode has
been set to Acknowledged.)
Note Items 1 and 2 are specified in the alarm history settings of the PT
Configuration, and item 3 is specified in the attribute settings of the
alarm list part. Item 4 is specified in the alarm list operation function
of the function switch part.
Additional Information
The alarm history saved in the PT can be saved to a file in CSV format using the
Memory Editor. Refer to Appendix A NV Memory Editor for information on the
NV Memory Editor.
PT
Alarm
No
Time Event
1 10:30:20
Triggered
1 10:35:25
Acknowledged
1 10:40:40
Recovered
3 10:50:20
Triggered
4 11:30:24
3 09/4/3 12:30:25
Recovered
Internal memory in PT
PT Screen
Monitor
12:30:25
Recovered
Alarm 3
11:30:24
Triggered
Alarm
10:50:20
Triggered
Alarm 3
10:40:40
Recovered
Alarm 1
10:35:25
Acknowledged
Alarm 1
10:30:20
Triggered
Alarm 1
Acknowledged
PLC
Triggered
09/4/3
09/4/3
09/4/3
09/4/3
09/4/3
09/4/3
09/4/3
09/4/3
09/4/3
09/4/3
09/4/3
4
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