Pilz PSS SB FT, Basic license - Manual (Page 98)

6-54 Modular Block System: Burner Management
Standard Function Blocks
SImultaneous OPEN and CLOSE commands
Multiple recurring OPEN and CLOSE commands
A “close valve” command at the Dir1 input resets the VAV
output immediately. The present state of the
acknowledgements at Pos1 and Pos2 has no influence on
the function.
With simultaneous OPEN/CLOSE
commands, the VAV output is reset.
Although the selected state has been achieved,
multiple OPEN/CLOSE commands have no
effect on the outputs.
SB154