Pilz PSS SB FT, Basic license - Manual (Page 174)

8-10
Examples
Modular Block System: Burner Management
Executing a function after D_E
The time delay can be used to start a function after the time delay has
elapsed.
The operand of
D_E leads into the AND-operation of the step enabling
conditions COND of the next step and together with COND, starts the
function.
In burner management a blower can, for example, have a delayed switch-
off or the time for building-up minimum air pressure can be monitored.
Delayed shutdown of blower
&
&
Fan
Feedback loop
monitoring
Blower actuator
Blower
overrun time
SB149
STEP
RDY
COND
STEP
W_BA
W_V
W_T
D_BA
D_V
D_T NEXT
W_E
D_E
SB067
RFK
SSNR
RFK1
RFK2
RSET
EIN FG
K SB160
BLOWER
SSNR
NEXT
STRT
STOP BLOW
RDY
SB149
STEP
RDY
COND
STEP
W_BA
W_V
W_T
D_BA
D_V
D_T NEXT
W_E
D_E
Start-button
Stop-button