PNOZ X7.1
Operating Manual PNOZ X7.1
21003-EN-06
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Function Description
The safety relay PNOZ X7.1 provides a safety-oriented interruption of a safety circuit. When
the supply voltage is applied via the E-STOP pushbutton, the “POWER” LED is lit. The unit
is ready for operation when the start circuit and feedback loop Y1-Y2 is closed.
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Input circuit is closed (e.g. E-STOP pushbutton not operated):
– The LED "CH.1/CH.2" will light.
– The safety contact 13-14 is closed, the auxiliary contact 21-22 is open. The unit is
active.
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Input circuit is opened (e.g. E-STOP pushbutton operated):
– The LEDs "CH.1" and "CH.2" goes out.
– Safety contact 13-14 is opened redundantly, auxiliary contact 21-22 is closed.
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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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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Start: Start circuit
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Power/Input: Supply voltage/input circuit
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Output safe: Safety contact
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Output aux: Auxiliary contact
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[1]: Automatic start
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[2]: Manual start
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a: Input circuit closes before start circuit
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b: Start circuit closes before input circuit
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t
1
: Switch-on delay
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t
2
: Delay-on de-energisation
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t
3
: Recovery time
