Pilz PSS SB FT, Basic license - Manual (Page 45)

Modular Block System: Burner Management 6-1
SB149: Sequence control
Block header
Input parameters
• RDY: Ready signal from the previous step
RDY = 1: ready signal is present
• COND: Global input for step enabling conditions for next step
COND = 1: all step enabling conditions fulfilled
• STEP: Signals burner start-up for the duration of a cycle and
deactivates the step
STEP = 1: first cycle of burner start-up and deactivating the
step
STEP = 0: no burner start-up detected
This parameter must be assigned with the same operand used
for the output parameter
STEP from SB152 “Burner: Start and
operator elements” and for the input parameter STEP of
SB157 “Ignition attempts” for the same burner.
• W_BA: Time base for step monitoring time (watchdog base)
Following values are valid:
0: 50 ms
1: 100 ms
2: 1 s
3: 10 s
4: 1 min
SB149
STEP
X - RDY
X - COND
X - STEP
B - W_BA
W - W_V
Z - W_T
B - D_BA
W - D_V
Z - D_T
NEXT - X
W_E - X
D_E - X
Standard Function Blocks