Pilz PSS SB FT, Basic license - Manual (Page 173)

8-9 Modular Block System: Burner Management
Step [n]
Function “Pre-purge”
L M 74.00 .Delay [n] Pre-purge time
U M 74.01 .RDY SB155 Pre-purge step
U ... Further conditions
= M 80.00 .COND[n+1] Step enabling conditions
Step [n+1]
SB149
STEP
X - RDY
X - COND
X - STEP
B - W_BA
W - W_V
Z - W_T
KB2 - B - D_BA
KF10 - W - D_V
T64 - Z - D_T
NEXT - X - M 70.00 .Step.[n,n+1]
W_E - X
D_E - X - M 74.00 .Delay [n]
SB155
PREPURGE
B - SSNR
M 70.00 .Step.[n,n+1] - X - NEXT
X - COND
ENBL - X
RDY - X - M 74.01 .RDY SB155
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