Mitsubishi Electric MELSEC FX2N-2LC User Manual page 51

Temperature control block
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FX2N-2LC Temperature Control Block
Alarm wait operation
The wait operation ignores the alarm status of the measured value (PV) occurred when the
power is turned on, and disables the alarm function until the measured value (PV) goes out of
the alarm status once.
When control starts, the wait operation is performed also.
< When the wait operation is performed >
Measured value (PV)
Temperature
set value (SV)
Alarm set
value
Wait operation region
Alarm status
Alarm re-wait operation
The alarm re-wait operation ignores the alarm status of the measured value (PV) occurred
when the power is turned on, and disables the alarm function until the measured value (PV)
goes out of the alarm status once.
When the temperature set value (SV) is changed, the measured value (PV) for deviation alarm
changes accordingly. At this time, even if the measured value (PV) becomes the alarm status,
the alarm re-wait function ignores it again and disables the alarm function until the measured
value (PV) goes out of the alarm status again.
Re-wait operation
Measured value (PV)
Temperature set
value (SV)
Alarm set value
Temperature set
value (SV1)
Alarm set value
Alarm status
Measured value
(PV)
Devia
tion
Time
Set value is changed.
Wait operation region
Wait operation region
< When the wait operation is not performed >
Measured value (PV)
Temperature
set value (SV)
Alarm set
value
Alarm status
Non-alarm
status
Measured value (PV)
Alarm 6
Measured value
(PV)
Devia
tion
Time
Alarm
status
Deviation
Deviation
Time
Non-alarm
status
Alarm status
6-5
6

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