Pilz PNOZ c1 24VDC 3n/o 1n/c - Manual (Page 6)

PNOZ c1
Operating Manual PNOZ c1
22197­EN­02 6
} The safety function remains effective in the case of a component failure.
} The correct opening and closing of the safety function relays is tested automatically in
each on­off cycle.
Block diagram/terminal configuration
Input Input
A1 A2 S21 S22
=
Power
Reset/
Start
S34
S11 S12
=
K1
K2
13 23 33
24 34 14
41
42
*
S33
*Insulation to the non­marked area: Protective separation (overvoltage category III),
Insulation of relay contacts against each other: Basic insulation (overvoltage category III),
protective separation (overvoltage category II)
Function description
When the supply voltage is supplied, the "POWER" LED illuminates. The unit is ready for
operation when the start circuit is closed.
} Input circuits closed (e.g. the E­STOP button is not pressed): The safety contacts are
closed and the auxiliary contact is open.
} Input circuit open (e.g. E­STOP operated): The safety contacts are open and the auxili­
ary contact is closed.
} Dual­channel operation with detection of shorts across contacts: redundant input circuit,
detects
– earth faults in the start and input circuit,
– shorts between 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 is closed and then the start circuit is
closed.
} Increase in the number of available instantaneous safety contacts by connecting con­
tact expansion modules or external contactors.