WEG PLC300 User Manual - page 58
Alarms
10-2 | PLC300
IMPORTANT: Information can be lost in case the PLC300 is turned off and the battery
voltage is below 1.9 V.
Automatic Software Recovery (ASR) - Indicates the user’s software was considered
invalid and was recovered from the SD card.
Watchdog Tasks – when Watchdog is detected in any task of the user, the program
stops and an alarm occurs, indicating which task generated Watchdog. Simultaneously
the Reading System Marker corresponding to the task is set (System Markers %SB0050
to %SB0055). The configuration of the Watchdog of the tasks is executed by means of
the WPS.
Nonexistent or Invalid SD Card – error in the attempt to write or read the SD Card
through the Event Log, Alarm Log or Recipes.
10.2 USER ALARMS
They are the alarms programmed by the user, using the WPS. They are activated by a bit marker.
Programming of the User Alarms
The user alarms must be configured by the WPS programming software. The user enters
the bit marker that will activate the alarm; it indicates if the actuation will be in the low or
high level of the bit and the texts of the alarm.
Other common data to all these alarms are also set by the WPS, such as: maximum number
of alarms and size of the alarm history.
These data affect the available memory, so they must be optimized for the user needs.
It is possible to show the content of a variable, formatted, in the second line of the alarm.
10.3 ALARM SCREENS
The PLC300 has two internal screens that help in the verification of the alarms, both internal
and the user’s. The List of Active Alarms and the Alarm History.
List of Active Alarms
By pressing the
The screen of active alarms is open, showing at the top, the last active alarm.
For instance:
A C T I V E A L A R M S
> 0 0 2 : A c t u a t o r 1 F a i l
0 0 1 : O v e r t e m p . K 1
In this example, the alarm “
Actuator1 Fault” was the last to happen, seeing that there
is still another active alarm. “
Overtemp. K1”.