Brainchild P91 - Igure 3.6 Deviation High Alarm 1 Operation

: A deviation high alarm alerts the operator when the process
deviates too high from set point value. When the process is higher
than SV+ASP1, a deviation high alarm occurs and the alarm is off as
the process is lower than SV+ASP1-A1HY. Figure 3.6 shows the
deviation high alarm operation.
Figure 3.6 Deviation high alarm 1 operation
Figure 3.6 Deviation high alarm 1 operation
Output 2
on
off
Process value
SV+ASP1
SV+ASP1-A1HY
Output 2
on
off
Figure 3.7 Deviation low alarm 1 operation
Figure 3.7 Deviation low alarm 1 operation
Output 2
on
off
SV+ASP1+A1HY
SV+ASP1
Output 2
on
off
Alarm value
SV (set point value)
Process value
: A deviation low alarm alerts the operator when the process
deviates too low from set point value. When the process is lower
than SV+ASP1 ( ASP1 is negative value ), a deviation low alarm
occurs, and the alarm is off as the process is higher than SV+ASP1+
A1HY. Figure 3.7 shows the deviation low alarm operation.
Alarm value
SV (set point value)
UM0P411A
52
OUT2=ALM1
OUT2=rAL1
OUT2=ALM1
OUT2=rAL1