Operating instructions Chapter 4
S300
8010948/YY96/2016-02-17 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 39
Subject to change without notice
Configurable functions
4.6 OSSDs
I
n an EFI system you define in the CDS which output signal switching device (OSSD) is
switched when there is an object in the protective field.
Internal OSSDs
Defines that the protective field or the protective fields switch the OSSDs on S300.
External OSSDs
The S300 transmits the status of the field sets (protective field/warning fields) via EFI.
The OSSDs on another device connected via EFI have switched.
– Connected S300 or S3000: The OSSDs on the second safety laser scanner are
switched.
– Connected safety controller (e.g. Flexi Soft): The OSSDs on the safety controller are
switched depending on its configuration.
– Connected network solution (e.g. safety remote I/O): The information is passed via the
network e.g. to an FPLC that must shutdown the dangerous state.
WARNING
Do not use the OSSD bit for safety relevant functions!
If the local OSSDs on the S300 are not used, the OSSD state is always transferred as
active via EFI. In this case the OSSD bit in the Flexi Soft safety controller is not allowed to
be used for safety-related functions.
The status of the protective fields is transmitted using EFI and can be combined in the
safety controller Flexi Soft as required. The signal of the safety outputs on the Flexi Soft
safety controller is transferred, e.g., to a machine or vehicle control.
WARNING
Pay attention to the logical values for the protective field status information on trans
to the Flexi Soft safety controller!
The status of an evaluated protective field is logical 1 if the protective field is unoccupied,
the status is logical 0 if the protective field is infringed (see section 12.5 “EFI status
information and control commands” on page 129). The status of a protective field that is
not evaluated is always logical 1.
4.6.1 External device monitoring (EDM)
The EDM checks if the contactors actually de-energize when the protective device is
tripped. If you activate external device monitoring, then the S300 checks the contactors
after each interruption of the protective field and prior to the machine restart. The EDM
can so identify if one of the contactors has welded, for instance. In this case the external
device monitoring places the system in a safe operational state and the OSSDs are not
switched back to the ON state.
The table shows how the S300 reacts if the external device monitoring detects a contactor
malfunction:
Without internal restart
interlock
or
with restart delay
The system locks completely (lock-out).
The error message appears in the 7<segment display.
With restart interlock The S300 switches its OSSDs to the OFF state.
The LED is illuminated.
The error message appears in the 7<segment display.
S300 on a contactor
malfunction
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