User`s guide

Table Of Contents
Alarm Management
Mitsubishi Electric, MA00759F 159
8.3 Alarm Properties
Right-click on the Alarms folder in the Project Manager and select Properties to
make general settings alarms and alarm lists. Alarms take up a different amount of
space in the alarm list, depending on the length of the alarm text and the number of
objects included. The space an alarm takes up can be calculated with the following
formula:
S = 74 + NC
S = Number of bytes
NC = Number of characters in the alarm text
The alarm list is re-written when it is full. 25% is deleted, so that only 75% remains.
Example: An alarm text of 38 characters, where each alarm takes up 80 bytes in the
alarm list, resulting in 1024 (list size =1 kbytes)/80 Max. 12 alarms in the alarm
list. When the 13th alarm is generated the alarm list will be re-written and only the
last 9 alarms will remain in the list.
Parameter Description
Active signal The digital signal the operator panel sets to one when there is an active
alarm.
Unacknowl-
edged signal
The digital signal the operator panel sets to one when there is an unac-
knowledged alarm.
List erase signal A digital signal which, when set to one, deletes non-active alarms in the list.