Pilz PSS SB FT, Basic license - Manual (Page 140)

6-96 Modular Block System: Burner Management
Standard Function Blocks
Error analysis during manual ignition start-up
An incorrect activation of the ignition transformer is not possible with
spurious signals at the inputs
MANU and S_IG. In each case, the
transformer will be switched on with Bit 0 from RDY and switched off when
Bit 3 from RDY is reset.
SB158