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To check the firmware revision of your control do one of the following:
1. Cycle power to the control while observing the number in the top display (this momentary numeri-
cal display reflects the current installed firmware version).
2. Navigate to the Factory Page by simultaneously pushing and holding the Advance Key and the Re-
set Key for approximately 8 seconds and then use the up or down arrow key to navigate to the Di-
agnostic Menu. Once there, push the Advance Key twice where the revision
the lower display and the upper display will indicate the current firmware revision.
2a. Navigate to the Setup Page and then the Limit Menu
2b. Set Source Function A to the desired device that will reset the limit (Digital I/O or Function Key)
2c. Define the Source Instance
3. Use a field bus protocol, i.e., Modbus, EtherNet/IP, etc...where a value of zero would be written to
the associated address (navigate to the Operations Page and look for Clear Limit under the Limit
Menu to find appropriate address).
4. Cycle the power to the controller.
Alarms
Alarms are activated when the output level, process value or temperature leaves a defined range. A
user can configure how and when an alarm is triggered, what action it takes and whether it turns off
automatically when the alarm condition is over. Configure alarm outputs in the Setup Page before set-
ting alarm set points. Alarms do not have to be assigned to an output. Alarms can be monitored and
controlled through the front panel or by using software.
Process Alarms
A process alarm uses one or two absolute set points to define an alarm condition. Select the type
with Type
(Setup Page, Alarm Menu).
a. t y
Set Points
The high set point defines the process value or temperature that will trigger a high side alarm. The low
set point defines the temperature that will trigger a low side alarm. View or change alarm set points
with Low Set Point
a. L o
Hysteresis
An alarm state is triggered when the process value reaches the high or low set point. Hysteresis
defines how far the process must return into the normal operating range before the alarm can be
cleared.
Hysteresis is a zone inside each alarm set point. This zone is defined by adding the hysteresis value
to the low set point or subtracting the hysteresis value from the high set point. View or change hyster-
esis with Hysteresis
Wa tl ow P M LE GACY™ Lim it C o nt ro l le r
and High Set Point
(Setup Page, Alarm Menu).
a. h y
High Side Alarm Range
Hysteresis
Normal Operating Range
Hysteresis
Low Side Alarm Range
Alarm Set Points and Hysteresis
(Operations Page, Alarm Menu).
a. h i
High Set Point
Low Set Point
Time
9 0
•
•
will be shown in
rEu
C hapter 8 Features
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