Pilz PSS SB HYD, Basic license - Manual (Page 96)

6-34 Modular Block System: Hydraulic Presses
Standard Function Blocks
Input circuitry
• Inputs S1 and S2 must use test pulses. These pulses should be entered
in the configurator (DB002) accordingly.
• Using SB064 for safety gate monitoring:
- Category 2
CAUTION!
This can only be used on safety gates which are regularly opened and
closed as part of the machine cycle.
If you are only using one switch/contact, S1 and S2 will have the same
input address. The switch must close when the safety gate is closed.
If you only use one switch/contact, malfunctions such as a button
plunger sticking or the gate failing to actuate cannot be detected. A
function test must therefore be carried out on the gate as part of each
cycle, i.e. the gate must be opened and closed regularly.
This requirement is met if the reset lock is activated each cycle by a
1/0 pulse edge at the
MRun input (e.g. each time the machine stops),
so that it is only possible to restart the machine after the gate has been
opened and closed.
- Category 4:
Use two separate switches/contacts, which must be operated
independently. Both switches must close when the safety gate is
closed. A cyclical function test on the gate is not required.
Output parameters
• ENBL: Enable bit
ENBL = 0: Enable is blocked
ENBL = 1: Enable occurs if
the safety gate is closed ( S1 = 1 and S2 = 1), any
errors have been rectified and confirmation has
been given via the
RSET signal.
SB064