Alarm Latch - Omron E5C User Manual

4 Basic Operation

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
Display
alh *
rest
* = 1 to 4
*
4 - 38
Alarm type: Lower-limit alarm with standby sequence
PV
Alarm value
Standby sequence
canceled
Alarm
Output
Parameter
Alarm 1 to 4 Hysteresis
Standby Sequence
Alarm hysteresis
Time
ON
OFF
ON (closed)
OFF (open)
Description
Alarm Initial Setting Level
Alarm Advanced Function
Setting Level
E5@C Digital Temperature Controllers User's Manual (H174)
Level