Pilz PSS SB FT, Basic license - Manual (Page 88)

6-44 Modular Block System: Burner Management
Standard Function Blocks
Timing diagrams
No automatic start after controlled shutdown
Monitoring of end positions
When DirC = 1 the CLOSE output sets and the, ENBL must be “1”.
O! = 1: the flap leaves the OPEN position.
After the control time the flap reaches the CLOSED position.
The acknowledgement
C! = 1 resets the CLOSE output.
The DirC input can also be reset by the user.
OPEN-output is set when DirO = 1
ENBL must be "1".
C! = 1: the flap leaves the CLOSED position.
After the control time, the flap reaches the OPEN position.
The acknowledgment
O! = 1 resets the OPEN output.
The DirO input can also be reset by the user.
The ENBL signal is cancelled, if both final position acknowledgements are
present. Despite a reset and DirO/DirC signals, no outputs are reset.
The ENBL signal is cancelled, if O!/C! are present simultaneously.
If the O!/C! acknowledgements are valid again, they can be reset and
with DirO/DirC the outputs can be activated again.
SB153