Alarm Value; Alarm Hysteresis; Close In Alarm/Open In Alarm - Omron e5ck User Manual

CHAPTER 3 BASIC OPERATION
JAlarm hysteresis
F Standby
sequence
JClose in alarm/open in alarm
3–10
• 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 out
put 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," general
ly the process value is within the alarm range, and alarm output smaller
than the set point, and alarm output becomes ON when this state contin
ues. However, if the alarm type is set to  lower limit alarm with standby
sequence", alarm output first becomes ON when the process value ex
ceeds 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, howev
er, 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 out
put 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 (normally
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 
Lower limit alarm
ON
OFF
Alarm value
Output
Alarm
ON ON
OFF OFF
ON OFF
OFF ON
: close in alarm".
Alarm hysteresis
Output LED
Lit
Not lit
Lit
Not lit