Pilz PSS SB FT, Basic license - Manual (Page 29)

4-5 Modular Block System: Burner Management
SB158: Ignition
SB158 controls the ignition and monitors the process. The ignition steps
must be called up individually. If a fault occurs, the enable is reset and a
shutdown occurs.
To ensure a fault-free ignition process, the safety valve must not be driven
from SB158 and another safety block at the same time.
SB159: Run
SB159 is used to set up the burner. These set-up steps must be called up
individually. If an error occurs, the enable is reset and a shutdown occurs.
Following a fault-free start-up SB159 issues a control enable.
To ensure a fault-free start-up process, the main valve must not be driven
from SB159 and another safety block at the same time.
SB160: Blower
SB160 is used to control a blower/fan on force draught burners.
The blower is switched on by pressing a button on the input parameter
STRT on SB160. The blower is switched off either by pressing a button on
the input parameter
STOP on SB160 or by setting the input parameter
NEXT via the sequence block “Blower overrun time”.
When controlling fans the rising edge of the signals on the input
parameters has priority.