ABB ScreenMaster RVG200 Operating Instructions Manual page 103

ScreenMaster RVG200
Paperless recorder
Note. The remaining parameters are applicable to all alarms.
Enable source
Log Enable/Ack Timeout
Log Enable
Acknowledge Timeout
Alarm group
OI/RVG200-EN
Select an alarm enable source. When the source is active, the alarm is
enabled. When the source is inactive the alarm is disabled. If set to None
the alarm is always enabled.
Note. An enable source must always be configured if it is to be used with
a delayed process alarm – see Fig. 7.15, page 98.
Set to On to record all changes in the alarm state in the Alarm Event log –
see Section 4.6.1, page 34.
Set to On to enable an alarm acknowledgement timeout period that can
then be set to between 1 and 999 minutes.
If the alarm is acknowledged but the alarm condition is not cleared within
the time-out period, the acknowledge state reverts back to active and
unacknowledged.
Note. The
Acknowledge Timeout
from being acknowledged but the reason for the occurrence being
ignored.
Example. An application has a vital requirement for a product to be kept
below a certain temperature (the alarm setpoint) and the recorder's alarm
relay is connected to an external audible warning device. If the
temperature exceeds the alarm setpoint, the alarm is activated, triggering
the audible warning. To preserve accountability, the alarm can be
acknowledged only by an Operator with alarm acknowledgement
privileges (see Section 7.7.6, page 76) and if acknowledged, the audible
warning is silenced. If the temperature does not drop below the alarm
setpoint before the time-out period expires, the alarm state is reset to
active / unacknowledged and the audible warning sounds again.
Assign the alarm to one or more of 12 groups.
The alarm states assigned to each group are 'ORed' together to create an
internal digital signal that may be assigned to relays, digital outputs or
internal digital controls.
function is designed to prevent an alarm
7 Configuration
101