Close In Alarm/Open In Alarm - Omron E5ZN Operation Manual

Alarm Hysteresis
4-2-3

Close in Alarm/Open in Alarm

Summary of Alarm
Operations
• When the E5ZN is set to "close in alarm," the status of the alarm output
function is normally open. When set to "open in alarm," the status of the
alarm output standby is normally closed.
• The close in alarm/open in alarm status can be set independently for each
alarm.
• The close in alarm/open in alarm settings are set in the "Alarm 1 to 3 open
in alarm" parameters.
• Default is "0: Close in alarm."
• When "alarm 1 open in alarm" is set, the heater burnout alarm and input
error outputs are both open in alarm.
Setting Alarm output function
Close in ON
alarm
OFF
Open in ON
alarm
OFF
• The alarm output will turn OFF (open) for about four seconds when power
is interrupted or after the power is turned ON regardless of the close in
alarm/open in alarm setting.
The figure below visually summarizes the above description of alarm opera-
tions when a lower limit alarm with standby sequence and close in alarm are
set.
Alarm value
PV
Alarm output function
Alarm output
Alarm output
ON
OFF
OFF
ON
Alarm type: Lower limit alarm with
standby sequence
Standby sequence
canceled
Section 4-2
Operation indicator
(LED)
Lit
Not lit
Lit
Not lit
Alarm hysteresis
Time
ON
OFF
ON (closed)
OFF (open)
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