Function blocks
247
1SVC 440 795 M1100
Timing relay
The display system provides 32 timing relays from T 01 to T 32.
A timing relay is used to change the switching duration and
the N/O and N/C times of a switching contact. The delay
times can be configured between 5 ms and 99 h 59 min.
Wiring a timing relay
You integrate a timing relay into your circuit in the form of a
contact and coil. The function of the relay is defined via the
parameter display. The relay is started via the trigger coil
T…EN and can be selectively reset via the reset coil T…RE.
The actual timeout running can be stopped via the third coil
T…ST.
Figure: 130: Display system circuit diagram with timing relay
Attention!
The shorter the cycle time, the faster the control and
regulation process.
Set as small a value for the set cycle time as possible. The
processing of the function blocks, reading of the inputs
and writing of outputs is only carried out once every cycle.
Exception: All function blocks that are processed
irrespective of the controller.
h
To prevent unpredictable switching states, use each coil of
a relay once only in the circuit diagram.
I 01---------------------------Ä T 02EN
I 02---------------------------Ä T 02RE
T 02Q1-------------------------Ä Q 01
I 03---------------------------Ä T 02ST
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