Allen-Bradley 1444-TSCX02-02RB User Manual page 216

Chapter 8 Configure Alarms
Table 45 - Alarms (continued)
Parameter Values
Transducer Select from:
State • Transducer Fault Considered
Behavior • Transducer Fault Monitored
• Transducer Fault Not Considered
Deadband 0...20
Alert Alarm 0.000...65.500 seconds
Delay Time
Danger Alarm 0.000...65.500 seconds
Delay Time
Apply Limits Select from:
From • Static Limits
• Static Limits with Adaptive Multipliers
• Output Tag Limits
Adaptive —
Limits
Danger High Any
Limit
Danger low
Limit
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This selection specifies the behavior of the Measurement Alarm if a transducer fault occurs.
Option
Transducer Fault
Considered
Transducer Fault
Monitored
Transducer Fault
Not Considered
Also consider:
Dual Channel
Measurements
Speed Measurements
Speed Dependent
Measurements
Enter a deadband (hysteresis) as a percentage of the alarm limit or alarm window range. This value is
the amount that the measured value must increase above or fall below (the non-alarm state direction)
the limit after exceeding it before the alarm condition clears.
The intent of the deadband is to minimize "chatter", where a measurement oscillates around the alarm
limit and causes the alarm condition to set and unset repeatedly.
For window alarms, the deadband is the stated percentage of the range of the window (high - low).
Enter the time that the measured value must persist at an Alert level before an Alert Alarm condition is
set.
The intent of an alarm delay is to help prevent random electronic or mechanically generated noise. This
noise can create rapid, short-lived signal spikes, from being interpreted, and acted on, as if an actual
alarm condition.
Enter the time that the measured value must persist at a Danger level before a Danger Alarm condition
is set.
The intent of an alarm delay is to help prevent random electronic or mechanically generated noise. This
noise can create rapid, short-lived signal spikes, from being interpreted, and acted on, as if an actual
alarm condition.
Select the source for the alarm limits and any applicable multipliers.
Option
Static Limits
Static Limits with
Adaptive
Multipliers
Output Tag Limits
When the Limit Source is "Static Limits w/ Adaptive Multipliers", click this option to access the Adaptive
Multipliers editor.
Adaptive Multipliers are uniquely defined for each Measurement Alarm.
Enter a value to specify the limit that when the measurement is above/below (unsafe direction) defines
a Danger Alarm condition.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Behavior
The Alarm is not evaluated (so never TRUE) if the transducer is in a Fault
condition.
Any alarm that was TRUE (actuated) clears if the associated transducer goes into
fault.
The Alarm is forced to TRUE (actuated) when the transducer is in a Fault
condition, regardless of the value of the measured parameter.
The behavior of the alarm remains strictly defined by the measurement.
Depending on the nature of a transducer fault and the specifics of the
measurement, a fault can force the measurement high, or low.
The preceding table information applies if either sensor faults.
The preceding table information applies if the speed transducer faults.
The preceding table information applies if the associated transducer faults
OR if the speed transducer faults.
Description
The normal mode. The limits are entered directly (so are static), along with one
(static) multiplier that the Setpoint Multiplier function manages.
The limits are entered directly (so are static), but uses up to five multipliers that
are applied depending on a control parameter.
The limits are passed to the module in the Controller Output assembly. No
multiplication is provided.