Pilz PSS SB HYD, Basic license - Manual (Page 222)

6-160 Modular Block System: Hydraulic Presses
Standard Function Blocks SB092
Function
SB092 monitors a three-position enable switch designed to protect
personnel where operating modes (setup) have safety devices suspended.
It can be used for the following applications:
• For enable switches conforming to EN 1921, 10/95, VDE 2853, 07/87
• For three-position switches conforming to EN 692 section 5.3.19.4,
08/96 and EN 693 section 5.3.19.4, 2001, for presses with automatic
reset and a slow closing speed (10 mm/s)
• For the switching diagrams documented in the following pages.
INFORMATION
Please bear in mind the following points (EN 1921, 10/95):
• An enable switch approves a dangerous movement but does not actually
trigger it.
• The enable switch alone must not be able to initiate a potentially
hazardous situation.
• If an enable device is required, it must be connected to either a category
0 or category 1 stop.
• If the switching device is fed back from stage 3 through stage 2 to stage
1, the enable function in stage 2 will not occur.
• It is possible to set a start-up and reset lock after feedback from stage 3.