Expansion modules - Automatech

Applications
Two-hand with override, Category 4, EN 954-1
3.0
2006-02
3.0 Applications
Two-hand with examples
override, Category 4, EN 954-1
Features
1 operating mode selector switch
1 E-STOP button
2 two-hand controls
Dual-channel with detection of
shorts across contacts
1 instantaneous load shutdown
Description
A machine can be operated by one or
two people. The machine is enabled
via two-hand buttons.
The machine's motor is switched on if:
The E-STOP button has not been
operated
and
The operating mode selector switch
is in position “0” and both two-hand
buttons are operated or
The operating mode selector switch
is in position “1” and two-hand button
2 is operated.
If one of these conditions is not met,
the signal at output A1.o0 will switch
from high to low and the motor will be
switched off. The status of the operating
mode selector switch is signalled
at outputs A1.o1 and A1.o3.
Feedback loop
The N/C contacts KM1.3 and KM2.3
on contactors KM1.3 and KM2.3 are
connected to the feedback loop input
A1.i11.
Reset
E-STOP monitoring must be activated
through the reset button S6.3 (manual
reset). If the conditions for starting the
motor have been met and the feedback
loop is closed, operation of the
plant is enabled.
Safety assessment
If a switch contact (A1.i0 ... A1.i14)
is overridden, this will be detected
as an error at the next operation.
Safety outputs A1.o0 and A1.o2 will
carry a low signal.
A short circuit between 24 VDC and
inputs A1.i0, A1.i1, A1.i3 ... A1.i10
will be detected as an error. The
safety outputs will carry a low signal.
A short circuit between 24 VDC and
the reset input A1.i12 will be detected.
A short circuit between 24 VDC and
the override input A1.i13 or A1.i14
will be detected.
A short circuit between 24 VDC and
a safety output will be detected and
the safety outputs will carry a low
signal.
It must be possible to protect the
operating mode selector switch
from unauthorised operation.
Configuration, page 1
E-STOP
– Switch type 3 (2 N/C)
– Detection of shorts between
contacts (A1.i0 - test pulse 0,
A1.i1 - test pulse 1)
– Manual reset (A1.i12 - test pulse
3)
Connection point
– Source connection point 1
3.0-16
Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
2006-02