Pilz PSS SB FT, Basic license - Manual (Page 188)

9-6
Appendix
Modular Block System: Burner Management
SB 155: Pre-purge
Version Date CRC
1.0 21.07.97 902C
1.1 05.05.98 3D0B
Changes from Version 1.0 to Version 1.1
Block-internal flags are reset so that output parameters ENBL and RDY are
not influenced for the whole duration of an existing error.
SB156: Tightness control
Version Date CRC
1.0 20.08.97 90EE
1.1 02.03.99 D4FF
Changes from Version 1.0 to Version 1.1
• The status of
GP+ and GP- are stored internally.
• In both steps "Test for air pressure" and "Test for gas pressure", the
pressure monitors P+ and P- will be tested for feasibility.
SB 157: Several ignition attempts
Version Date CRC
1.0 12.12.97 13CB
1.1 19.03.98 9B7C
STOP
Changes from Version 1.0 to Version 1.1
• Addition of the input parameter STEP.
- This parameter signals burner start-up for the duration of a cycle.
- The input parameter STEP replaces the internally used Bit 0 from
DW 1021 in DB 015.
- This allows you to operate several work cycles (e.g. burners) on one
PSS.