Bfm#233] Alarm Dead Band Setting - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U

8.2.55 [BFM#233] Alarm dead band setting

To these buffer memories, set the dead zone for alarms 1 to 4.
The setting is applied to alarms 1 to 4 in all channels.
When the measured value (PV) is around the alarm set value, the alarm status and non-alarm status may be
repeated due to input fluctuations.
By setting the alarm dead zone, it is possible to prevent repetitions of the alarm status and non-alarm status.
BFM No.
CH1 CH2 CH3 CH4
#233
*1. Input span for internal temperature input
Scaling span for internal micro voltage input
External input span for external input
Example of operation 1 (Upper limit input value alarm, Upper limit deviation alarm)
Measured value (PV)
Alarm set value
Alarm status
Example of operation 2 (Lower limit input value alarm, Lower limit deviation alarm)
Measured value (PV)
Alarm set value
Alarm status
→ For details on the measured value (PV), refer to Subsection 8.2.3.
→ For details on the alarm setting value, refer to Subsection 8.2.16.
→ For details on the alarm mode setting, refer to Subsection 8.2.53.
Description
Setting range : 0 to 100 (0.0 to 10.0% of span)
Measured value (PV)
Measured value (PV)
→ For details on the alarm function, refer to Chapter 7.
*1
Dead zone
Time
Non-alarm status
Alarm status
Dead zone
Time
Non-alarm status
Alarm status
8 Buffer Memory
8.2 Buffer Memory Details
Initial
R/W Backup
value
10 R/W
113
1
2
3
4
5
6
7
8
9
10