Pilz PNOZ X8P Data Sheet
E-STOP relays, safety gate monitors
Up to Category 4, EN 954-1
PNOZ X8P
Safety relay for monitoring E-STOP
pushbuttons and safety gates.
Approvals
PNOZ X8P
Unit features
` Positive-guided relay outputs:
– 3 safety contacts (N/O), instanta-
neous
– 2 auxiliary contacts (N/C), in-
stantaneous
` 2 semiconductor outputs
` Connection options for:
– E-STOP pushbutton
– Safety gate limit switch
– Reset button
` LED indicator for:
– Switch status channel 1/2
– Supply voltage
` Semiconductor outputs signal:
– Switch status channel 1/2
– Supply voltage is present
` Plug-in connection terminals (either
cage clamp terminal or screw terminal)
` See order reference for unit types
Unit description
The safety relay meets the requirements of EN 60204-1 and IEC 602041 and may be used in applications with
` E-STOP pushbuttons
` Safety gates
Safety features
The relay conforms to the following
safety criteria:
` The circuit is redundant with built-in
self-monitoring.
` The safety function remains effecti-
ve in the case of a component failure.
` The correct opening and closing of
the safety function relays is tested
automatically in each on-off cycle.
` The tranformer is short circuit-
proof. An electronic fuse is used on
a DC supply.
Block diagram
A1 A2 S21 S22 S52
S11 S12
~
Input
Input
=
Power
Feed-
back
0 V 24 V
Y1 Y2
Y30 Y31 Y32 Y35
S33 S34 S37
Reset/
Start
13 23 33 41K251 51
K1
14 24 34 42
52 52
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
NSG-D-2-142-01/06
E-STOP relays, safety gate monitors
Up to Category 4, EN 954-1
PNOZ X8P
Function description
` Single-channel operation: no red-
undancy in the input circuit, earth
faults in the reset and input circuit
are detected.
` Dual-channel operation without de-
tection of shorts across contacts:
redundant input circuit, detects
– earth faults in the reset and input
circuit,
– short circuits in the input circuit
and, with a monitored reset, in
the reset circuit too.
Timing diagram
1 2
POWER
Reset/Start
Input
Output safe
Output aux.
Out semi RUN
Out semi CH
t1 t2
t1 t2
` Dual-channel operation with detec-
tion of shorts across contacts: redundant input circuit, detects
– earth faults in the reset and input
circuit,
– short circuits in the input circuit
and, with a monitored reset, in
the reset circuit too,
– shorts between contacts in the
input circuit.
` Automatic start: Unit is active once
the input circuit has been closed.
ab
t1
t1
t2
` Manual reset: Unit is active once
the input circuit is closed and then
the reset circuit is closed.
` Monitored reset: Unit i s ac t iv e o nc e
– the input circuit is closed and
then the reset circuit is closed
and opened again.
– the reset circuit is closed and
then opened again once the input circuit is closed.
` Increase in the number of available
contacts by connecting contact expander modules or external contactors/relays.
ab
t2
t1
3
t2
t1
t2
Key
` Power: Supply voltage
` Reset/start: Reset circuit S33-S34,
Y1-S37
` Input: Input circuits S21-22, S11-
S12, S52
` Output safe: Safety contacts 13-14,
23-24, 33-34
Wiring
Please note:
` Information given in the “Technical
details” must be followed.
` Outputs 13-14, 23-24, 33-34 are
safety contacts, outputs 41-42, 5152 are auxiliary contacts (e.g. for
display).
` To prevent contact welding, a fuse
should be connected before the
output contacts (see technical details).
` Calculation of the max. cabling runs
in the input circuit:
l
max
` Output aux: Auxiliary contacts 41-
42, 51-52
` Out semi RUN: Semiconductor out-
put supply voltage Y35
` Out semi CH: Semiconductor out-
put switch status Y32
` c: Automatic reset
` d: Manual reset
R
lmax
=
I
max
Rl / km
R
= max. overall cable resi-
lmax
stance (see technical details)
/km = cable resistance/km
R
l
` Use copper wire that can withstand
60/75 °C.
` Sufficient fuse protection must be
provided on all output contacts with
capacitive and inductive loads.
` e: Monitored reset
` a: Input circuit closes before reset
circuit
` b: Reset circuit closes before input
circuit
: Switch-on delay
` t
1
` t2: Delay-on de-energisation
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
NSG-D-2-142-01/06Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
-2
E-STOP relays, safety gate monitors
Up to Category 4, EN 954-1
PNOZ X8P
Preparing for operation
` Supply voltage
Supply voltage AC DC
A1
A2
L1
N
PE
` Input circuit
Input circuit Single-channel Dual-channel
E-STOP
without detection of shorts across
contacts
S21
S22
S11
S12
S52
S1
S21
S22
E-STOP
with detection of shorts across contacts
S11
S52
Safety gate
without detection of shorts across
contacts
S21
S22
S11
S12
S52
S1
S21
S22
S11
S12
S52
A1
A2
S11
S21
S22
S12
S11
S12
S52
S1
L+
L-
S1
S1
S2
Safety gate
with detection of shorts across contacts
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
S11
S52
S11
S12
S21
S22
S1
NSG-D-2-142-01/06
S2
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