Pilz PNOZ s2 C 24VDC 3 n/o 1 n/c - Manual (Page 4)

PNOZ s2
Operating Manual PNOZ s2
21394-EN-07
4
Safety features
The relay meets the following safety requirements:
} The circuit is redundant with built-in self-monitoring.
} 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 on-off cycle.
} The unit has an electronic fuse.
Block diagram/terminal configuration
Input
A1 A2
=
Power
Reset/
Start
S34
=
Y32
K1
K2
13 23 33 41
24 34 42 14
Interface expansion
unit
*
Centre: Front view with cover, right: Front view without cover
*Safe separation in accordance with EN 60947-1, 6 kV
Function description
} Single-channel operation: no redundancy in the input circuit, earth faults in the reset
and input circuit are detected.
} 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.
} Monitored start with falling edge: Unit is active once
– the input circuit is closed and then the start circuit is closed and opened again.
– the start circuit is closed and then opened again once the input circuit is closed.
} Monitored start with rising edge: Unit is active once the input circuit is closed and
once the start circuit is closed after the waiting period has elapsed (see technical de-
tails).
} Increase in the number of available instantaneous safety contacts by connecting con-
tact expander modules or external contactors/relays;
A connector can be used to connect 1 PNOZsigma contact expander module.