Mitsubishi Electric MELSEC iQ-R Series User Manual page 32

Section 3 NAME AND FUNCTION OF EACH PART
(2) How to set the upper/lower limit alarm monitoring
Setting procedures are as following.
(a) Check that Operating condition setting request (Yn9) is OFF.
(b) Set the alarm item in the buffer memory (Un\G11 / Un\G21), alarm value (Un\G12, 13 / Un\G22, 23),
alarm reset method (Un\G14 / Un\G24), and alarm delay time (Un\G15 / Un\G25).
(c) Set Operating condition setting request (Yn9) to ON.
Operation starts at each set value, and then, Operating condition setting completion flag (Xn9) is turned
ON.
(d) Check that Operating condition setting completion flag (Xn9) becomes ON, and then set Operating
condition setting request (Yn9) to OFF.
Operating condition setting completion flag (Xn9) will be turned OFF.
Operating condition setting request (Yn9)
Operating condition setting completion flag (Xn9)
(3) Behavior of the upper/lower limit alarm
(a) When the alarm reset method is in the "0: Self-retention" setting (example of an upper limit monitoring
at alarm 1)
(i) If the measured value that was set with the alarm 1 monitoring item 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) Even if the measured value goes below the upper limit, Alarm 1 flag (XnA) retains an ON status (Self-
retention).
During the self-retention, ALM1 LED is turned on.
(iii) By turning Alarm 1 reset request (YnA) to ON, Alarm 1 flag (XnA) will be turned OFF.
At this time, ALM1 LED is turned off.
(iv) Check that Alarm 1 flag (XnA) becomes OFF, and then set Alarm 1 reset request (YnA) to OFF.
Alarm 1 reset request (YnA)
Figure 3.4.4-2 Time chart of the upper/lower limit alarm (alarm reset method = "Self-retention")
Figure 3.4.4-1 Time chart of alarm monitoring setting
Upper limit
Alarm
delay time
Alarm 1 flag (XnA)
OFF
ALM1 LED OFF
(i)
ON
OFF
OFF
ON
ON
Flashing ON
(ii) (iii)
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OFF
ON
OFF
OFF
OFF
(iv)