Yokogawa Button Operated MV2000 - Manual (Page 83)

3-9 M-4660
Measurement Channels and
Alarms
1
2
3
4
5
6
7
8
9
10
11
12
13
App
Index
3.5 Setting the Auxiliary Alarm Function
An example of the relay action when AlarmACK is executed is shown below. This
example is for the case when the output relay AND item is set to None.
Normal
Alarm ACK
Alarm output relay
Alarm 2
Alarm 1
Relay is activated at the next scan interval
Activated
Alarm
occurrence
Alarm
occurrence
Deactivated
Reset
Alarm ACK
Relay is activated on the next alarm occurrence
Alarm output relay
Alarm 2
Alarm 1
Activated
Alarm
occurrence
Alarm
occurrence
Deactivated
• Hysteresis > Meas CH
• High/Low
The hysteresis width for alarm occurrence/release of the high/low limit alarm that is
set for measurement channels.
Selectable range: 0.0% to 5.0% of the span or scaling width.
• Delta High/Low
The hysteresis width for alarm occurrence/release of the difference high/low limit
alarm that is set for measurement channels.
Selectable range: 0.0% to 5.0% of the span.
• Hysteresis > Math CH (/M1 and /PM1 options), Ext. CH (/MC1 option)
The hysteresis width for the alarm occurrence/release of the high/low limit alarm that
is set for computation channels and external input channels.
Selectable range: 0.0% to 5.0% of the measurement span.