PNOZ 16
Operating Manual PNOZ 16
1003517-EN-09
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Function Description
The safety relay PNOZ 16 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.
} Input circuit is closed (e.g. E-STOP pushbutton not operated):
– The LEDs "CH.1" and "CH.2" are lit.
– Safety contacts 13-14 and 23-24 are closed. The unit is active.
} Input circuit is opened (e.g. E-STOP pushbutton operated):
– The LEDs "CH.1" and "CH.2" go out.
– Safety contacts 13-14 and 23-24 are redundantly opened.
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 16 detects
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– shorts across contacts 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.
} Operating with pressure sensitive mat: When the pressure sensitive mat is actuated, a
short is formed between the inputs and internal fault detection is energised. Safety con-
tacts open and the "EXT.FAULT" LED is lit. If the pressure sensitive mat is cleared and
supply voltage is maintained, the unit is ready for operation again once the recovery time
has elapsed.
} Increase in the number of available contacts by connecting contact expandsion modules
or external contactors/relays.
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