Pilz PIT m4SEU, Operating Manual

Page: 42 / 68

Function description
Operating Manual PIT m4SEU
1004648-EN-02
| 42
5.6.3.3 Evaluation of the Key ID number with advanced communication
Evaluation of the Key ID number in advanced communication mode is identical to the hand-
shake-controlled communication mode. Please refer to the timing diagram and the flow-
chart from the previous section Handshake-controlled communication mode [ 33] .
In advanced communication mode, two control signals are also available:
}
ack → to adopt the preselected operating mode
}
keylock → to disable the change of operating mode
Both signals are sent from the controller to the PIT m4SEU. These are standard inputs that
do
not affect the safety function of the PIT m4SEU.
5.7 PITreader interface
The PITreader interface contains an internal interface for communication with the authentic-
ation system PITreader and a voltage output for its supply voltage. The following informa-
tion is downloaded via a defined protocol:
}
Permission is received
}
Status information is sent, in accordance with the Interface for status information [ 23]
Only transponder keys with permission 1-5 are registered on the PIT m4SEU. With any
other permissions, the PIT m4SEU does not receive any information via the inserted
transponder key.
After the transponder key is removed, permission to select operating modes is locked after
the reaction time t (see Technical details [ 62] ).
The voltage output may only be used for the supply voltage for the authentication system
PITreader.
5.8 Operating mode lock and operating mode preselection
5.8.1 Operating mode lock
The function of the operating mode lock is to enable and disable the request for a change
of operating mode via a digital input.
A change of operating mode can be triggered by:
} Operating the pushbutton
} Removing the transponder key with OM fallback and service fallback
When a change of operating mode is requested during the operating mode lock,
}
the corresponding display element flashes briefly,
}
the interface for status information signals "No permission" and
}
the operating mode outputs do not switch.
You can deactivate the function, although it is configured. To do this, connect a "1" signal to
input IDi0.