PNOZ 16SP
Operating Manual PNOZ 16SP
19900-EN-05
9
Block diagram/terminal configuration
*Insulation between the non-marked area and the relay contacts: Basic insulation (over-
voltage category III), Protective separation (overvoltage category II)
Function Description
The safety relay PNOZ 16P 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.
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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.
– A high signal is present at the semiconductor output switch state Y32.
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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.
– A low signal is present at the semiconductor output switch state Y32.
Semiconductor output short across contact Y35
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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
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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 cir-
cuit, PNOZ 16SP detects
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– shorts across contacts in the input circuit.