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Alarm Delays Section 4-11
4-11 Alarm Delays
4-11-1 Alarm Delays
• Delays can be set for the alarm outputs. ON and OFF delays can be set
separately for alarms 1, 2, and 3. The ON and OFF delays for alarm 1
function only for the alarm function. If the alarm 1 function is set to be out-
put as an OR with other alarms (i.e., the heater burnout alarm, HS alarm,
heater overcurrent alarm, or input error output alarm), delays cannot be
set for the other alarms. The ON and OFF delays for alarms 1, 2, and 3
also apply to the individual SUB1, SUB2, and SUB3 indicators and to
communications status. The alarm ON delays will also function when
power is turned ON or when moving from the initial setting level to opera-
tion level (e.g., to software resets). All outputs will turn OFF and the OFF
delays will not function when moving to the initial setting level or when an
alarm is output for a A/D converter error.
Operation of Alarm ON and OFF Delays (for an Upper-limit Alarm)
• The alarm will not turn ON if the time that the alarm is ON is equal to or
less than the ON delay set time. Also, the alarm will not turn OFF if the
time that the alarm is OFF is equal to or less than the OFF delay set time.
• If an alarm turns OFF and then back ON during the ON delay time, the
time will be remeasured from the last time the alarm turns ON. Also, if an
alarm turns ON and then back OFF during the OFF delay time, the time
will be remeasured from the last time the alarm turns OFF.
Parameters Related to Alarm Delays
PV
Alarm setting
Alarm hysteresis
Alarm status
ON delay
set time
ON delay set time
OFF delay
set time
Alarm Latch = OFF
Alarm will not turn ON.
Parameter name Symbol Set (monitor) values
Alarm 1 ON Delay a1on 0 to 999 (s)
Alarm 2 ON Delay a2on 0 to 999 (s)
Alarm 3 ON Delay a3on 0 to 999 (s)
Alarm 1 OFF Delay a1of 0 to 999 (s)
Alarm 2 OFF Delay a2of 0 to 999 (s)
Alarm 3 OFF Delay a3of 0 to 999 (s)
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