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7 Setup Program
Action
72
Absolute:
At the moment of change, the limit comparator responds with its normal func-
tion.
Relative:
The limit comparator is in the OFF state.
If a change of the limit value or the (limit comparator) set value occurs that
would normally cause the comparator to switch to the ON state, this reaction
is suppressed. This condition remains in force until the actual input value to
the comparator has again gone outside the switching region (gray area).
Example:
Monitoring the process value x of the controller, using the lk4 function
Setpoint change w
1
a) Initial state
b) State at the moment of change.
The limit comparator remains OFF, although the actual value has moved into
the switching region!
w
c) Controlled state
The limit comparator continues to fulfil its normal function.
This function is used, for example, to prevent a limit comparator switching
during the run-up phase.
→ w
2
=
1
IMAGO F3000 / 10.01
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