PNOZ X2.1
Operating Manual PNOZ X2.1
1003354-EN-08
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Function Description
The safety relay PNOZ X2.1 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
start circuit S33-S34 is closed.
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Input circuit is closed (e.g. E-STOP pushbutton not operated):
– Safety contacts 13-14 and 23-24 are closed, the unit is active.
– The LEDs "CH.1" and "CH.2" are lit.
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Input circuit is opened (e.g. E-STOP pushbutton operated):
– Safety contacts 13-14 and 23-24 are redundantly opened.
– The LEDs "CH.1" and "CH.2" go out.
Operating modes
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Single-channel operation: No redundancy in the input circuit, earth faults in the start and
input circuit are detected.
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Dual-channel operation with detection of shorts across contacts: Redundant input circuit,
detects PNOZ X2.1
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– Shorts across contacts in the input circuit.
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Automatic start: Unit is active once the input circuit has been closed.
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Manual start: Unit is active once the input circuit and the start circuit are closed.
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Increase in the number of available contacts by connecting contact expandsion modules
or external contactors/relays.
Timing diagram
[1]
[2]
Legend
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Power: Supply voltage
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Start: Start circuit
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Input: Input circuit
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Output safe: Safety contacts
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[1]: Automatic start
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[2]: Manual start
