Pilz PSS SB FT, Basic license - Manual (Page 104)

6-60 Modular Block System: Burner Management
Standard Function Blocks
SB156: Tightness control
Block header
Input parameters
• SSNR: Safety subroutine number
Permitted value range: 1 ... 200
Format: byte constants KB001 ... KB200
(further information about the
SSNR can be found in the
sections “Administration data blocks DB015, DB016 and
DB017” and “Input parameter
SSNR” in chapter 5).
Value of DW0000/DB 015 = 0: no error present
• NEXT: Sequence input
Bits 0...4 of the input byte represent a processing step within
the block. By setting the bit, the corresponding step in the
block is started.
• SyOK: General plant status
Note: supply the output parameter
ENBL from SB152 to the
input parameter SyOK of SB56
SyOK = 1: no error
SyOK = 0: error in the system, leads to shutdown
• V4?: Selection of the exhaust valve
V4? = M110.01 (RLO=1): exhaust valve VAV4 present
V4? = M110.00 (RLO=0): No separate exhaust valve present,
exhaust carried out via the main valve
VAV3
(Note: exhaust via the main valve is only permitted, if fuel
cannot come into contact with any parts in the burner chamber
whose temperature lies above the ignition temperature of the
fuel used).
SB156
TIGHT_C
B - SSNR
B - NEXT
X - SyOK
X - V4?
X - P+
X - P-
W - T_V
Z - T
ENBL - X
RDY - B
VAV1 - X
VAV3 - X
VAV4 - X
GP+ - X
GP- - X