Pilz PSS SB HYD, Basic license - Manual (Page 211)

Modular Block System: Hydraulic Presses 6-149
INFORMATION
If valves Y1 and Y2 are acknowledged via proximity switches which
cannot be pulsed, the signal lines of the proximity switches must be laid
in different multicore cables within the duct. This will ensure that a short
cannot occur between the two signal lines.
This safety precaution will not be necessary if you use proximity switches
with diverse signals.
• TOn: Maximum permitted reaction time for switching on both valves
(in ms)
TOn = KF 001 ... KF 350 when VTyp = 0 (directional control
valve)
TOn = KF 000 ... KF 350 when VTyp = 1 (poppet valve)
Ensure you follow the guidelines given under “Safety
guidelines for input parameters
TOn and TOff”
• TOff: Maximum permitted reaction time for switching off both valves
(in ms)
TOff = KF 001 ... KF 350 when VTyp = 0 (directional control
valve)
TOff = KF 000 ... KF 350 when VTyp = 1 (poppet valve)
Ensure you follow the guidelines given under “Safety
guidelines for input parameters
TOn and TOff ”
• Y1On: Start signal for “Operate valve Y1”
Y1On = 0/1 pulse edge: Switch on valve Y1
Y1On = 1/0 pulse edge: Switch off valve Y1
• Y2On: Start signal for “Operate valve Y2”
Y2On = 0/1 pulse edge: Switch on valve Y2
Y2On = 1/0 pulse edge: Switch off valve Y2
INFORMATION
The input parameters Y1On and Y2On are interlocked with respect to
each other. This guarantees that only one valve can be operated at a
time.
Neither of the valves can be switched on while the block detects an error
(reset lock).
It is only possible to switch on one valve if both valves are in their start
position (see input parameters
S1 and S2).