Pilz PSS SB FT, Basic license User Manual
Page 7
5
Modular Block System: Burner Management
Timing diagrams
6-52
Valve closed without power
6-52
Reset spurious acknowledgements
6-53
Spurious acknowledgement as valve opens
6-53
SImultaneous OPEN and CLOSE commands
6-54
Multiple recurring OPEN and CLOSE commands
6-54
SB155: Pre-purge
6-56
Block header
6-56
Input parameters
6-56
Output parameters
6-56
Function
6-56
Error messages
6-57
Blocks required
6-57
Programming guidelines
6-58
Timing diagrams
6-58
Signal cycle with interrupted and uninterrupted pre-purge
process
6-58
Spurious signal sequence at NEXT and RDY inputs
6-59
SB156: Tightness control
6-60
Block header
6-60
Input parameters
6-60
Output parameters
6-61
Function
6-61
Error messages
6-62
Blocks required
6-63
Programming guidelines
6-64
Timing diagrams
6-67
Signal cycle of uninterrupted tightness control on a plant with an
exhaust valve
6-67
Signal cycle of uninterrupted tightness control on a plant without
an exhaust valve
6-69
Loss of minimum pressure signal as valve VAV1 is incorrectly
seated
6-70
Loss of maximum pressure signal as valve VAV3 or VAV4 is
incorrectly seated
6-71
Enable and cancel tightness control via SyOK
6-72
Spurious, undefined NEXT input combinations
6-73