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Section 2 NS Series Functions 2-20 Special Functions
2-441
NS Series Programming Manual
2-20-2 Alarm/Event History Function
The alarm/event history function continually checks the status of bits registered as alarms or events
and records the date, time, and frequency during operation when the bit turns ON. The records can be
edited on a personal computer because they are saved as CSV files.
Procedure for Using Alarm/event Histories
Perform the following procedure to use the alarm/event history function.
1. Make alarm/event history settings.
When a screen is created using CX-Designer, register the bit memory as an alarm or event under
PT - Alarm/Event setting . Make related information and other settings as required. Refer to Outline
in 2-14 Alarms and Events for details on alarm/event settings.
2. Initialize alarm/event history.
If necessary, initialize the alarm/event history from the PT System Menu and clear old records be-
fore starting recording.
3. Execute alarm/event history.
When bits registered as alarms/events turn ON or OFF during PT operation, a record will be kept
that alarms/events occurred or were cleared.
4. Confirm alarm/event history records.
There are two methods for checking the alarm/event history records.
•
Check using System Menu. Alarm histories can be checked under the System Menu. The records
can be displayed in the order the alarms/events occurred (sort by occurrence) or in the order of
frequency.
•
Check using functional objects. The records can be checked using alarm/event summary and his-
tories created on screens. The records can be displayed in order of occurrence, order of frequency,
or order of priority.
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♦
Alarm/event histories can be initialized using system memory bit $SB32.
♦
You can set whether to automatically initialize log data when screen data is downloaded by select-
ing
PT – Transfer in the Transfer Settings Menu.
In the following cases, however, be sure to initialize the log data.
•
Alarm/event settings, data log settings, or other settings related to logs are changed.
•
A project different from the project stored in the NS-series PT is downloaded.