UNITRONICS
Alarm Task
Alarms
Built in the controller
Powerful function
(V130/V350/V570)
Movie
2/19
What is an alarm?
An Alarm is an event that must be reported to the
machine operator
The event is a change in the Alarm’s Trigger
condition, linked to Boolean or numeric value
An Alarm can:
 Provide instructions
 Require operator action
 Play an active role in conditions
 running the process
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Alarms
HMI is already built in – no need of special design
Vision controllers support up to 128 Alarms,
divided into up to 16 groups
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Terminology- Active alarm
An alarm is active as long as its Trigger
condition is met.
Whenever the Trigger Condition is:
 True, the Alarm is active
 False, the Alarm is inactive
An active alarm cannot be reset.
When active, an alarm is marked with the
character ‘Y’ in the Alarm Details display
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Groups definition on the PC
 Pause Alarms
 Clear pending alarms and
rescan bit
 Number of active alarms
 Alarm is Active
 pending for reset /view /
acknowledge
 Alarm is Pending
How to do it
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Alarms
 Alarms in groups
 Large option for trigger
alarms
 Option for help/comments
with each alarm
 Option to set password for
acknowledge/reset the alarm
 Multilingual support – via
String Library
 Alarm history
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Displays Alarm
There are four types of displays
 Groups with Pending Alarms
 Alarms in Group
 Alarm Details
 Alarm History
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Displays Alarm
Groups with Pending Alarms
Alarms are arranged in groups.
This display shows all groups that contain one or
more pending Alarms. If the Alarms in a group are
no longer pending,the group is not displayed.
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Displays Alarm
Alarms in Group
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ID
Alarm ID number, assigned when the Alarm is created.
Time On
Time stamp of the most recent time the Alarm became Active.
Ack
If the Ack button has been pressed.
Alarm
Name
The Alarm name assigned in the Alarms Configuration.
Details
drills down to the details of the specific Alarm.
Displays Alarm
Alarm Details
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Group
The Alarm's Group ID and Name.
ID
The Alarm's ID and name.
Date
Date and time stamp of the most recent time the Alarm became
Active.
Count
The number of times the Alarm became Active before Pending
action is taken.
Active
Shows if the Alarm's Trigger condition is true.
Additional
info
This window contains instructions for the machine operator.
Displays Alarm
Alarm History
 One can request that an alarm will be logged.
 Up to 256 alarms can be saved in the memory of
the PLC. when it is full it functions according to FIFO.
 Alarms from the history buffer can be viewed in the
alarms history display
Note: If the PLC contains an SD card ,you can turn SB 352 ON
to enable the PLC to write the history to the SD card .
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Displays Alarm
Alarm Pause
When the Pause icon appears at the bottom of
the display, it means that the Alarms action is
suspended .
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How does it run?
 The alarm task is running as
part of the PLC's cycle
 The task's displays are part of
the operating system
 It's up to the user to call the
alarm's displays
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Important!
When the alarm’s
displays are on,
the applications
display is still
active in the
background and
subroutines that
are called under
it are still running
Ladder Elements
One can jump to the group display, the alarms in
group display or to a detailed alarm display.
The jump will be done only if the conditions are met
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Thank You
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Terminology
 Active alarm
 Pending for view
 Pending for acknowledge
 Pending for reset
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Test your Knowledge: Active Alarm
Can an operator reset an alarm while the
temperature is above a set point ?
Submit
18/19
Clear
Groups definition on the PC
Lets open
VisiLogic application
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