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MCTB
62
When the process value falls below the control set point plus alarm set point minus the
alarm hysteresis (PV < SV+ASP-AHY), the alarm is off.
Deviation Low
The alarm is dependent upon the control set point and alerts the operator when the
process deviates too far below the set point value. For deviation low alarms, the alarm
set point is entered as a negative value. When the process is lower than the control set
point plus the alarm set point (PV < SV+ASP), a deviation low alarm occurs. When the
process value rises above the control set point plus alarm set point plus the alarm
hysteresis (PV < SV+ASP+AHY), the alarm is off.
Deviation Band
The alarm sets two trigger levels relative to the control set point value. For deviation
band alarms, the alarm set point is entered as a positive value. The two alarm trigger
levels are then defined as SV+ASP and SV-ASP for the high and low alarm values.
When the process value is greater than the high alarm value (PV > SV+ASP) or less than
the low alarm value (PV < SV-ASP), a deviation band alarm occurs. When the process
value is within the high and low trigger levels by the value of the alarm hysteresis (PV <
SV+ASP-AHY and PV > SV-ASP+AHY), the deviation band alarm is off.
End of Program
The alarm
is not associated with the process value or set point. The alarm is turned on
upon completion of an automatic ramp/soak program. Once the alarm has occurred it
must be manually cleared from the Alarm screen of the runtime application.
The
Inhibit
selection is used to enable the hold mode of operation for the alarm. When on, this setting prevents
the alarm from activating on power up even when an alarm condition is present. The alarm will be blocked until
the alarm condition clears. Once cleared, the alarm will then operate normally and activate when an alarm
condition occurs.
The
Silent
selection is used to disable annunciation of the alarm in the runtime application. When on, this
setting prevents the alarm from being displayed on the alarm screen and also prevents it from being recording
in alarm history. It also prevents the alarm icon from being shown and the audible alarm from sounding when
the alarm occurs. Note that the alarm will still be accessible from the Alarm settings screen in the runtime
application (see section
) so that the alarm set point, delay and alarm message can still be edited.
The
selection is used to enable email/SMS capability for the alarm. When on, if the email client of the
MCTB has been properly configured and email addresses have been entered into the system to receive email
and/or SMS messages on alarm (see section
), the alarm message will be sent to the applicable email
addresses when the alarm occurs. If this setting is off, no email/SMS message will be sent regardless of the
email client settings.
The
Ringback
selection is used in conjunction with the alarm delay. When on, this setting allows the alarm to
be reset and cleared from the Alarm screen in the runtime application even if the alarm is still active by resetting
the alarm delay. The alarm will then reactivate after the alarm delay period expires as long as the alarm
condition remains active.
The
Alarm Setpoint
can be entered when the alarm function is set for a process or deviation type of alarm.
The alarm set point will also be available in the MCTB runtime application.
The alarm
Hysteresis
can be entered when the alarm function is set for a process or deviation type of alarm.
It is used to eliminate rapid on/off cycling of the alarm output by applying a safe-sided dead band to the alarm.
When the alarm set point is exceeded, the alarm will activate. The alarm will not deactivate until the process
rises above (for low alarm) or falls below (for high alarm) the alarm set point by the hysteresis value.
The alarm
Delay
can be entered when the alarm function is set for a process or deviation type of alarm. The
alarm delay will also be available in the MCTB runtime application. The alarm delay is used to delay the
activation of the alarm for a specified period of time. The delay is entered in seconds and can be set with a
minimum of zero to a maximum 5999 seconds (99 minutes and 59 seconds).
Содержание MCTB 4.3
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