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4 Basic Operation
E5@C Digital Temperature Controllers User’s Manual (H174)
4-11 Alarm Hysteresis
4
4-11-2 Alarm Latch
• The alarm latch can be used to keep the alarm output ON until the latch is canceled regardless of the
temperature once the alarm output has turned ON.
Any of the following methods can be used to clear the alarm latch.
• Turn OFF the power supply. (The alarm latch is also cleared by switching to the Initial Setting
Level, Communications Setting Level, Advanced Function Setting Level, or Calibration Level.)
• Use the PF Key.
• Use an event input.
For details on setting the PF Key, refer to 5-18 Setting the PF Key. For details on setting events, refer to
5-4 Using Event Inputs.
Summary of Alarm Operation
The following figure summarizes the operation of alarms when the Alarm Type parameter is set to
"lower-limit alarm with standby sequence" and "close in alarm" is set.
Parameters
* * = 1 to 4
4-11-2 Alarm Latch
Display Parameter Description Level
alh
*
Alarm 1 to 4 Hysteresis Alarm Initial Setting Level
rest Standby Sequence Alarm Advanced Function
Setting Level
ON
PV
OFF
Alarm type: Lower-limit alarm with standby sequence
Alarm value
Alarm hysteresis
Time
Standby sequence
canceled
Alarm
Output OFF (open)
ON (closed)
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