Close In Alarm/Open In Alarm - Omron E5CN User Manual

Alarm Hysteresis
4-2-3

Close in Alarm/Open in Alarm

Summary of Alarm
Operation
Parameters
72
• When "close in alarm" is set, the status of the alarm output function will be
output as is. When "open in alarm" is set, the status of the alarm output
function will be reversed before being output.
• Close in alarm/open in alarm can be set separately for each alarm.
• Close in alarm/open in alarm is set in the "alarm 1 open in alarm" to
"alarm 3 open in alarm" parameters (advanced function setting level).
• The default is n-o (close in alarm).
• When "alarm 1 open in alarm" (advanced function setting level) is set to
"open in alarm," the heater burnout alarm and input error output are also
set to "open in alarm."
Setting
Close in alarm ON
Open in alarm
• The alarm outputs will turn OFF (i.e., the relay contacts will open) when
power is interrupted and for about two seconds after the power is turned
ON regardless of the close in alarm/open in alarm setting.
The following figure summarizes the operation of alarms when the alarm type
is set to "lower-limit alarm with standby sequence" and "close in alarm" is set.
Alarm value
Alarm
Output
Symbol
alh*
Alarm 1 to 3 hysteresis: Advanced function setting
level
rest
Standby sequence: Advanced function setting level
al*n
Alarm 1 to 3 open in alarm: Advanced function setting
level
* = 1 to 3
Note
Alarm output function
OFF
ON
OFF
Alarm type: Lower-limit alarm with standby sequence
PV
Standby sequence
canceled
Parameter: Level
Section 4-2
Alarm output Alarm indicator
ON Lit
OFF Not lit
OFF Lit
ON Not lit
Alarm hysteresis
Time
ON
OFF
ON (closed)
OFF (open)
Alarm
Alarm
Alarm
Description