Pilz PSS SB FT, Basic license - Manual (Page 178)

8-14
Examples
Modular Block System: Burner Management
Step [n+1]
Driving the air flaps
During the burner cycle the air dampers can be driven using SB153. After
the control enable, position monitoring is no longer required and the
motors for the dampers can be driven directly via SB153.
If you wish to carry out such programming, you can use the block diagram
as shown on the next page.
LN M 74.00 ENBL SB152
U M 73.01 Auxiliary flag negative edge
= M 73.02 Pulse flag
R M 73.01 Auxiliary flag negative edge
L M 74.00 ENBL SB152
S M 73.01 Auxiliary flag negative edge
L ... Input “Open flap”
= ... Output “OPEN: Drive flap motor”
L ... Input “Close flap"
= ... Output “CLOS: Drive flap motor”
1
2
SB149
STEP
M 70.00 .Step.[n,n+1] - X - RDY
M 80.00 .COND[n+1] - X - COND
X - STEP
B - W_BA
W - W_V
Z - W_T
B - D_BA
W - D_V
Z - D_T
NEXT - X - M 70.01 .Step.[n+1,n+2]
W_E - X
D_E - X