Yokogawa PC-Based MX100 - Manual (Page 70)

2-56 IM MX180-01E
Alarm Hysteress
You can set a width (hysteresis) to the values used to activate and release alarms.
Alarm hysteresis prevents frequent activation and release of alarms when the measured/
computed value is unstable around the alarm value.
Alarm value
Alarm reset
Alarm occurrence
Upper limit alarm Lower limit alarm
Measured value
or computed value
Alarm reset
Hysteresis
Alarm value
Alarm occurrence
Measured value
or computed value
Alarm Indcaton on the Numercal Dsplay
Four alarm signals are displayed above the value (see the figure below). The changes in
the color of these alarm signals indicate the alarm status.
Alarm 1 status
Alarm 2 status
Alarm 3 status
Alarm 4 status
Black: Alarm not set
Green: Alarm OFF
Red: Alarm occurrence
Note
When using computation channel alarms, do not disconnect the MX100 and the PC software.
Computation channel alarms will not occur because the computation function does not work
when using only the MX100.
2.9 Settng Alarms and Alarm Indcatons