Pilz PSS SB FT, Basic license - Manual (Page 89)

Modular Block System: Burner Management 6-45
Missing acknowledgement
Behaviour of the flaps in the case of missing or unrequested
end position acknowledgements (single attempt).
The OPEN or CLOSE output is activated once only, together
with the ENBL output, if a “1” signal at the DirC or DirO input
is present, i.e. a fault is registered.
The
OPEN or CLOSE output is reset at the same time as the
ENBL output after the position monitoring time, which is set
via parameters.
If the control time monitoring has responded once, a new
control command
OPEN/CLOSE can be issued after a
RSET pulse.
If the control time has been exceeded and, subsequently,
a required acknowledgement issued, this must still be
reset before further control commands are handled.
Control time
The short signals at the inputs are spurious signals.
They are to be expected and will not trigger a fault.