CHAPTER 3 BASIC OPERATION
E5CK
3–10
Ă• The hysteresis of alarm outputs when alarms are switched ON/OFF can
be set as follows:
ON
OFF
Alarm hysteresis
Alarm value
Alarm value
ON
OFF
Upper limit alarm Lower limit alarm
Alarm hysteresis
Ă• 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".
Ă• Standby sequence" is a function for unconditionally turning alarm outĆ
put OFF when the process value has left the alarm range once and it next
enters the alarm range.
Ă• For example, when the alarm type is set to lowerĆlimit alarm," generalĆ
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 continĆ
ues. However, if the alarm type is set to lowerĆlimit alarm with standby
sequence", alarm output first becomes ON when the process value exĆ
ceeds the alarm setting value to leave the alarm range and once again
falls below the alarm value.
Ă• The standby sequence is canceled when an alarm is output. It is, howevĆ
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.
JClose in alarm/open in alarm
Ă• When the controller is set to close in alarm," the status of the alarm outĆ
put function is output as it is. When set to open in alarm," the status
of the alarm output function is output inverted.
Alarm
Output Output LED
ON ON Lit
ose
n a
arm
OFF OFF Not lit
ON OFF Lit
pen
n a
arm
OFF ON Not lit
Ă• Alarm type and close in alarm (normally open)/open in alarm (normally
close) can be set independently for each alarm.
Ă• Close in alarm/open in alarm is set in the alarm 1 to 3 open in alarm"
parameters (setup mode). Default is ĂĂ
: close in alarm".
JAlarm hysteresis
F Standby
sequence
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