Alarm Dead Zone Setting - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U
7.3

Alarm Dead Zone Setting

In BFM#233, set the dead zone of alarms 1 to 4.
This setting is applied to all of alarms 1 to 4.
When the measured value (PV) is near the alarm set value, the alarm status and the non-alarm status may be
repeated by fluctuation in inputs. In order to cope with such a case, by setting the alarm dead zone, repeating
of the alarm status and the non-alarm status can be prevented.
Upper limit input value alarm, Upper limit deviation alarm
Measured value (PV)
Alarm set value
Alarm status
Lower limit input value alarm, Lower limit deviation alarm
Measured value (PV)
Alarm set value
Alarm status
Upper/lower limit deviation
Measured value (PV)
Alarm set value
Set value (SV)
Alarm set value
Alarm status
→ For details on the alarm dead band setting, refer to Subsection 8.2.55.
Measured value (PV)
Measured value (PV)
Measured value (PV)
7.3 Alarm Dead Zone Setting
Dead zone
Time
Non-alarm status
Alarm status
Dead zone
Time
Non-alarm status
Alarm status
Non-alarm status
Alarm status
7 Alarm
1
2
3
4
5
6
7
Dead zone
8
Dead zone
Time
9
10
71