Pilz PNOZ s7 - Unit Features and Safety; Safety features

PNOZ s7
Operating Manual PNOZ s7
21399-EN-10
8
Unit features
} Positive-guided relay outputs:
– 4 safety contacts (N/O), instantaneous
– 1 auxiliary contact (N/C), instantaneous
} LED for:
– Input status, channel1
– Input status, channel2
– Switch status of the safety contacts
– Fault
} Plug-in connection terminals (either spring-loaded terminal or screw terminal)
} See order reference for unit types
Safety features
The unit meets the following safety requirements:
} The contact expander module expands an existing circuit. As the output relays are
monitored via the base unit's feedback loop, the safety functions on the existing circuit
are transferred to the contact expander module.
} The safety function remains effective in the case of a component failure.
} Earth fault in the feedback loop:
Detected, depending on the base unit that is used.
} Earth fault in the input circuit:
The output relays de-energise and the safety contacts open.