Specifications

Graphic Operation Terminal GOT-F900 Alarm MODE 10
10-9
10.3.1 Operation when alarms have occurred
The figure below shows the outline of operation performed when alarms have occurred.
When a bit device assigned as an alarm device turns ON (OFF
(
ON), the GOT recognizes
that an alarm has occurred.
When two or more alarms have occurred, the GOT recognizes them one by one in turn.
• The ON/OFF status of alarm devices are read every time communication is performed
(every 300 to 400 ms) between the GOT and the PLC when FX-PCS-DU/WIN-E is used or
at the time interval (variable within the range of 600 to 100 ms) set by "Monitor Cycle" in
"Alarm History Common Setting" when GT Designer is used.
When using the F920GOT-K, the monitor interval greatly changes according to the
processing situation (such as the alarm or observe status function).
The pulse change may not be caught if there are many tasks and the pulse interval of the
target bit devices is short. In order to catch the pulse change, make sure to maintain the
ON/OFF status of the bit device for a sufficient length of time.
• Inside the GOT, alarm messages are displayed (overlaying on the user screens) or a
specified screen is displayed in the screen mode, alarm devices are stored in the history
and their frequencies are counted in the alarm mode in accordance with the contents set
preliminarily in the screen creation software.
• When two or more alarms have occurred, they are sorted in the ascending order of alarm
device No. in the alarm list and stored in alarm history in the order of occurrence.
When GT Designer is used, the alarm history can be stored in the order of occurrence (from
the oldest one) or in the reverse order of occurrence (from the latest one).
Screen mode
Alarm 0
When many alarms have
occurred, corresponding
alarm messages are
displayed in the ascending
order of device No.
Instead of an alarm
message, a specified
screen can be displayed.
DISPLAY
STATUS
screen
Alarm 0
Alarm 3
Alarm mode
n
n+1
n+2
n+3
0
1
2
3
254
255
n+254
n+255
ALARM
HISTORY
screen
Alarm 0
Alarm 3
ALARM
FREQUENCY
screen
Alarm 01
Alarm 10
Alarm 20
The GOT monitors bit devices
in the PLC, and recognizes
that alarms have occurred
when they turn ON.
(Communication is performed
every 300 to 400 ms.)
n
n+1
n+2
n+3
n+254
n+255
ON
OFF
OFF
ON
Up to 256 consecutive
alarm devices
Sequence program
OFF
OFF
n+255
Output to the printer
(Alarm devices and alarm
messages are printed.)
GOT PLC
Alarm
message
Device
No.
ON/OFF
status
Device
No.
n