Omron E5AK PROGRAMMABLE TYPE User Manual page 47

J Alarm hysteresis
F Standby
sequence
J Close in alarm/open in alarm
• The hysteresis of alarm outputs when alarms are switched ON/OFF
can be set as follows:
Upper limit alarm
Alarm hysteresis
ON
OFF
Alarm value
• Alarm hysteresis is set independently for each alarm in the "alarm 1
to 3 hysteresis" parameters (level 2 mode). Default is "0.02:
0.02%FS".
• "Standby sequence" is a function for unconditionally turning alarm
output OFF when the process value has left the alarm range once and
it next enters the alarm range.
• For example, when the alarm type is set to " lower-limit alarm," gen-
erally the process value is within the alarm range, and alarm output
smaller than the set point, and alarm output becomes ON when this
state continues. However, if the alarm type is set to " lower-limit
alarm with standby sequence", alarm output first becomes ON when
the process value exceeds the alarm setting value to leave the alarm
range and once again falls below the alarm value.
• The standby sequence is canceled when an alarm is output. It is, how-
ever, restarted later by one of the following conditions:
Operation is started or power is turned ON.
A pattern is started.
The program advances to the next step.
The SP of the current step is changed.
The currently running alarm value is changed.
The input shift value is changed.
Advance is executed.
• When the controller is set to "close in alarm," the status of the alarm
output function is output as it is. When set to "open in alarm," the
status of the alarm output function is output inverted.
Close in alarm Close in alarm
Open in alarm Open in alarm
• Alarm type and close in alarm (normally open)/open in alarm (nor-
mally close) can be set independently for each alarm.
• Close in alarm/open in alarm is set in the "alarm 1 to 3 open in
alarm" parameters (setup mode). Default is "
3.4 Setting Alarm Type
Lower limit alarm
ON
OFF
Alarm value
Alarm Output
ON ON
OFF OFF
ON OFF
OFF ON
Alarm hysteresis
Output LED
Lit
Not lit
Lit
Not lit
: close in alarm".
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