Burkert Type 1150 - Manual (Page 68)

66 - 1150
C
ONFIGURATION
Absolute
At the time of alteration, the limit comparator acts in accordance with its function.
Relative
The limit comparator is in the OFF status. An alteration of the limit value or the (limit comparator) setpoint
could cause the limit comparator to switch ON. Such a reaction will be suppressed, and this condition is
maintained until the (limit comparator) process value has moved away from the switch-on region (gray
area).
Example:
Monitoring the (controller) process value x with function lk4
Setpoint alteration w
1
w
2
a) Initial condition
b) Condition at the time of the alternation
The limit comparator remains “OFF” although the process value is within the switch-on region!
c) Stabilized condition
The limit comparator again operates in accordance with its function.
This function also prevents a limit comparator from being triggered during the start-up phase.