Pilz PSS SB FT, Basic license - Manual (Page 158)

6-114 Modular Block System: Burner Management
Standard Function Blocks
Block Connection required Reason
SB157 Perform AND-operation Flame fault
on all ENBL from SB150
→
evaluation
FLAs (SB157)
Bit 0, NEXT (SB158)
→
Detecting the step
BIT0 (SB157) “Switch on ignition
transformer”
Bit 3, NEXT (SB158)
→
Detecting the step
BIT3 (SB157) “Pilot flame
established”
Pulse at
RDY (SB157)
→
Immediate further ignition
must set the step flag NEXT attempt after a failure
of the previous step from
step “Switch on ignition
transformer”
STEP (SB152)
→
Burner start detection and
STEP (SB149, SB157) resetting sequence
SB158 ENBL (SB152)
→
Valve seal when a
SyOK (SB158) shutdown occurs
RUN (SB158)
→
For pilot flame
RUN (SB150) monitoring
FLAI (SB158)
→
For pilot flame
MONI (SB150) monitoring
Triggered pulse via neg. edge Fault leads to a normal
from ENBL (SB158) shutdown (when AuSt = 1
→
AND-connection before with restart)
ERR (SB152)
or
Triggered pulse via neg. edge
Fault leads to a safety
from ENBL (SB158) shutdown
→
AND-connection before
CHAI (SB152)