Pilz PSS SB FT, Basic license - Manual (Page 85)

Modular Block System: Burner Management 6-41
• T: Timer which measures the time T_V
• RSET: reset button (N/O)
Output parameters
• ENBL: Enable flag bit
ENBL = 1: this function is fault-free
• OPEN: OPEN = 1: open flap
OPEN = 0: no drive direction “open”
• CLOS: CLOS = 1: close flap
CLOS = 0: no drive direction “close”
Function
• Monitoring the flap status (open/closed), the direction of the change in
position and the reaction time due to a change in position
• Opening and closing a flap after a received request
• The contact-bounce time due to a change in position is one cycle.
Error messages
Any fault that is detected will be stored statically in the corresponding error
data word (SSNR) of DB015 (1st data block).
• Error messages in DB015
- Bit 00: Status of contact C! does not correspond to the previous drive
direction.
Remedy: Check the limit switch and the switch time
T_V and
reset the error. If neither limit switch is operated, the drive
direction must be re-selected.
- Bit 01: Status of contact O! does not correspond with the previous
drive direction.
Remedy: Check the limit switch and switch time
T_V and reset
the error. If neither limit switch is operated, the drive direction
must be re-selected.