Pilz PSS SB FT, Basic license - Manual (Page 64)

6-20 Modular Block System: Burner Management
Standard Function Blocks
Flame monitor error
Spurious signals when monitoring for “flame not established”
Flame monitor fault when monitoring for
“flame not established”.
After the ENBL-output is reset, an enable is not set even with valid “1”-
Signals at F_S1 and RUN.
Monitoring for “flame established” must be first run through without
error, before switching to monitoring for “flame established” can be
carried out.
Only the permitted signal
combination at
F_S1/
F_S2 can reactivate the
enable.
If there is a “1”-Signal at
the MONI input,
F_S1/
F_S2 monitoring is active
and reacts immediately
when the
ENBL output is
reset.
Spurious signals /
signal combinations
at
F_S1 and F_S2 do
have no effect on the
block’s function.
Invalid signals deactivate the enable. The enable signals processed in other
program sections (flame monitor sequence, SB 152) will, via this program
section, trigger the burner to shutdown.
The enable signal will be issued again only if the inputs are
F_S2 = 1 and
F_S1 = 0. With other signal combinations, the enable remains cancelled.
SB150