Pilz PSS SB FT, Basic license - Manual (Page 118)

6-74 Modular Block System: Burner Management
Standard Function Blocks
SB157: Several ignition attempts
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/DB015 = 0: no error present.
• SyOK: General plant status (system OK)
Note: supply the output parameter
ENBL from SB152 to the
input parameter SyOK of SB157.
SyOK = 1: no error
SyOK = 0: error in the system, leads to a shutdown.
• BIT0: First step for ignition
(see Programming guidelines)
• BIT3: Step “Flame stabilising time ended; flame established”
(see Programming guidelines)
• FLAs: Global signal input of the flame monitor
(see Programming guidelines)
• ITRY: Permitted number of direct successive ignition attempts.
SB157
SB157
IGNI_TRY
B - SSNR
X - SyOK
X - BIT0
X - BIT3
X - FLAs
B - ITRY
X - STEP
W - T_V
Z - T
RDY - X