Pilz PSS SB FT, Basic license - Manual (Page 155)

Modular Block System: Burner Management 6-111
Timing diagrams
Uninterrupted blower control
Spurious, conflicting control signals
An active BLOW output can be reset via a NEXT pulse.
A step (to be defined by the user) which activates
blower overrun time can also affect SB160. The
RDY
output acts as an acknowledgement of the NEXT pulse,
which can be polled in a SB149 of the cycle control.
A start pulse switches the blower
on. The
BLOW output remains set
until a stop signal is issued. A new
start pulse sets the output again.
The STOP and the NEXT
signals have priority over the
STRT signal. An existing
STOP or NEXT signal
disables the switch-on pulse.