to press brakes, as addressed in EN 693 (2001). A complete classification
of devices that act as safety barriers is given in Sklet’s
(2006) paper. One possible definition is as follows: ‘‘safety barriers
are physical and/or non-physical means planned to prevent, control,
or mitigate undesired events or accidents.’’ These include
the Safety Instrumented Systems (SISs), further defined in the standard
IEC:61508 (1998). The SIS classification encompasses any
electrical, electronic or programmable electronic device, composed
of any combination of sensor(s), logic solver(s), and final element(
s) such as relays that activate or deactivate an output. Leveson
(1995) defined the lockout function as that which ‘‘prevents a
dangerous event from occurring or prevents someone or something
from entering a dangerous area or state’’. According to the
classification carried by Sklet (2006), the safety system analyzed
in this work is an SIS. It is an active device, in that its function requires
an action, here defined as ‘‘stop engine.’’ The device also increases
the safety of the worker with respect to a specific risk,
thereby carrying out a lockout function.
to press brakes, as addressed in EN 693 (2001). A complete classification
of devices that act as safety barriers is given in Sklet’s
(2006) paper. One possible definition is as follows: ‘‘safety barriers
are physical and/or non-physical means planned to prevent, control,
or mitigate undesired events or accidents.’’ These include
the Safety Instrumented Systems (SISs), further defined in the standard
IEC:61508 (1998). The SIS classification encompasses any
electrical, electronic or programmable electronic device, composed
of any combination of sensor(s), logic solver(s), and final element(
s) such as relays that activate or deactivate an output. Leveson
(1995) defined the lockout function as that which ‘‘prevents a
dangerous event from occurring or prevents someone or something
from entering a dangerous area or state’’. According to the
classification carried by Sklet (2006), the safety system analyzed
in this work is an SIS. It is an active device, in that its function requires
an action, here defined as ‘‘stop engine.’’ The device also increases
the safety of the worker with respect to a specific risk,
thereby carrying out a lockout function.
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