Pilz PSS SB FT, Basic license - Manual (Page 172)

8-8
Examples
Modular Block System: Burner Management
Using delay time D_E on SB149
Executing a function during D_E
The time delay can be used to carry out a function for the duration of the
time delay cycle.
The operand from
D_E goes to the AND-operation of the step enabling
conditions COND of the following step.
In burner management, the pre-purge can run, for example, for the
duration of the time
D_E.
D_E as pre-purge time
SB149
STEP
RDY
COND
STEP
W_BA
W_V
W_T
D_BA
D_V
D_T NEXT
W_E
D_E
SB149
STEP
RDY
COND
STEP
W_BA
W_V
W_T
D_BA
D_V
D_T NEXT
W_E
D_E
&
&
SB155
PREPURGE
SSNR
NEXT
COND ENBL
RDY
Time value of
pre-purge