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SAFETY OUTPUTS (OSSDs)
The OSSD (Output Signal Switching Device) is a safety output for safety-related parts of a
machine control system. When the device detects an object or a person in the Safety
zone, the OSSD goes to the OFF-status (the machine stops). The device generates signals
to monitor the OSSD status and these periodically force the OSSD into a temporary OFF
condition if the OSSD is ON (when there is no object detected in the Safety zone). If the
OFF signal does not return to the internal control circuit, the Safety Laser Scanner will
switch into fault status. An OSSD pair must always be wired to a safety-related part of a
machine control system to ensure safety.
WARNING
WARNING
Figure 9 - Correct connection of
Figure 11 - Incorrect connection
To avoid dangerous conditions, the user must never wire only one OSSD to
a safety-related part of a machine control system.
The safety contacts of each OSSD couple cannot be connected in series or
in parallel, but they must be used separately (in the double channel safety
controller input). An erroneous configuration will cause the device to
switch the output into failure condition. Connect both OSSDs to the device
to control: otherwise the degree of system safety that the Safety Laser
Scanner has to control will be put in danger.
the load
of the load (2)
SAFETY OUTPUTS (OSSDS)
Figure 10 - Incorrect connection
of the load (1)
Figure 12 - Incorrect connection
of the load (3)
INSTRUCTION MANUAL
65
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