Function Description; Operating Modes - Pilz PNOZ X8P Operating Manual

PNOZ X8P

Function Description

The safety relay PNOZ X8P provides a safety-oriented interruption of a safety circuit. When
supply voltage is supplied the "POWER" LED is lit. The unit is ready for operation when the
feedback loop Y1-Y2 and the start circuit S33-S34 are closed. The "START" LED is lit.
} Input circuit is closed (e.g. E-STOP pushbutton not operated):
– LEDs "CH1 IN" and "CH2 IN" will light.
– The "START" LED goes out.
– Safety contacts 13-14, 23-24 and 33-34 are closed, auxiliary contacts 41-42 and
– LEDs "CH1" and "CH2" will light.
– A high signal is present at the semiconductor output switch state Y32.
} Input circuit is opened (e.g. E-STOP pushbutton operated):
– LEDs "CH1 IN" and "CH2 IN" go out.
– Safety contacts 13-14, 23-24 and 33-34 are opened redundantly, auxiliary contacts
– The LEDs "CH1" and "CH2" go out.
– A low signal is present at the semiconductor output switch state Y32.
Semiconductor output supply voltage Y35
}
A high signal is present at semi-conductor output Y35 if the supply voltage is present and
the internal fuse has not blown.

Operating modes

}
Single-channel operation: No redundancy in the input circuit, earth faults in the start and
input circuit are detected.
}
Dual-channel operation with detection of shorts across contacts: Redundant input circuit,
PNOZ X8P detects
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– shorts across contacts in the input circuit.
}
Dual-channel operation without detection of shorts across contacts: Redundant input cir-
cuit, detects PNOZ X8P
– earth faults in the start and input circuit,
– short circuits in the input circuit.
}
Automatic start: Unit is active once the input circuit has been closed.
} Manual start: Unit is active once the input circuit and the start circuit are closed.
}
Monitored start: Unit is active once
– the input circuit is closed and then the start circuit is closed and opened again.
– the start circuit is closed and then opened again once the input circuit is closed.
}
Increase in the number of available contacts by connecting contact expandsion modules
or external contactors/relays.
Operating Manual PNOZ X8P
19820-EN-10
51-52 are opened. The unit is active.
41-42 and 51-52 are closed.
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