Mitsubishi Electric MELSEC iQ-R Series User Manual page 33

Section 3 NAME AND FUNCTION OF EACH PART
(b) When the alarm reset method is in the "1: Self-reset" setting (example of an upper limit monitoring at
alarm 1)
(i) If the measured value that was set with the alarm 1 monitoring factor exceeds the upper limit and the
situation continues and remains for the alarm 1 delay time, Alarm 1 flag (XnA) will be turned ON.
At the same time, ALM1 LED flashes.
(ii) If the measured value goes below the upper limit, Alarm 1 flag (XnA) will be turned OFF. At this time,
ALM1 LED is turned off.
(iii) When the measured value that was set with the alarm 1 monitoring item goes below the upper limit
within the alarm 1 delay time even though the measured value exceeds the upper limit, the alarm 1
flag (XnA) will remain in OFF status.
Alarm 1 flag (XnA)
Figure 3.4.4-3 Time chart of the upper/lower limit alarm (alarm reset method = "Self-reset")
(c) When the alarm reset method is in the "Self-reset" setting (Example of a lower limit monitoring at alarm
2)
(i) If the measured value that was set with the alarm 2 monitoring factor goes below the lower limit and
the situation continues and remains for the alarm 2 delay time, Alarm 2 flag (XnB) will turn ON.
At the same time, ALM2 LED flashes.
(ii) If the measured value exceeds the lower limit, Alarm 2 flag (XnB) will turn OFF. At this time, ALM2
LED is turned off.
(iii) When the measured value that was set with the alarm 2 monitoring item exceeds the lower limit within
the alarm 2 delay time even though the measured value goes below the lower limit, the Alarm 2 flag
(XnB) will remain in OFF status.
Alarm 2 flag (XnB)
Figure 3.4.4-4 Time chart of the upper/lower limit alarm (alarm reset method = "Self-reset")
Upper limit
Alarm
delay time
ON
OFF Flashing
ALM1 LED
(i)
Lower limit
Alarm
delay time
ON
OFF
OFF Flashing
ALM2 LED
(i)
Alarm
delay time
OFF
(iii)
(ii)
Alarm
delay time
OFF
(iii)
(ii)
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