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Output time diagrams for different comparator modes are shown in Fig. 6.8.
Fig. 6.8 Time diagrams for Comparator modes
Additional settings for Comparator modes:
1. If a logic unit is used in
“Alarm Outside Limits” mode, it can be useful to block the
first alarm, because the controlled value must not be inside the valid range when
starting control. To use the option set the parameter
bL.St
(PL-2 group) to ON.
Output time diagrams for this option are shown in Fig. 6.9.
Fig. 6.9
Option “Ignore alarm on start”
2. The parameters
Ht.on
and
Ht.oF
(PL-2 group) are switch-on and switch-off de-
lays. They can be used to protect the output element from frequent switching
Output time diagram for this option is shown in Fig. 6.10.
3. Also the minimum duration of on- or off state of output irrespective of the input
state can be set in the parameters
dL.on
and
dL.oF
(PL-2 group) accordingly.
Output time diagram for this option is shown in Fig. 6.11.