Range Alarm; Alarm Wait Operation - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U
7.2.6

Range alarm

When the absolute deviation (= Measured value (PV) - Set value (SV)) is less than the alarm set value, an
alarm is issued.
For example, if the alarm set value is "+10 C", an alarm is issued when the measured value (PV) is inside the
range from "set value (SV) + 10 C" to "set value (SV) - 10 C".
Measured value (PV)
Alarm set value
Set value (SV)
Alarm set value
Alarm status
7.2.7

Alarm wait operation

The wait operation ignores the alarm status of the measured value (PV) when control is started, and disables
the alarm function until the measured value (PV) enters the alarm region after the wait period has ended.
When the wait operation is performed
Measured value (PV)
Set value (SV)
Alarm set value
Wait operation region
Alarm status
Measured value (PV)
Measured value (PV)
Set value (SV)
Deviation
Alarm set value
Time
Alarm status
Deviation
Deviation
Time
Non-alarm status
Alarm status
When the wait operation is not performed
Measured value (PV)
Measured value (PV)
7 Alarm
7.2 Alarm Functions
1
2
3
4
5
Deviation
6
Time
7
Non-alarm status
Alarm status
8
9
10
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