Applications Of The Safety Switches - SICK Direct IN4000 Instrucciones De Servicio

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Chapter 2
154
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On safety
2.2

Applications of the safety switches

The safety switches of the IN4000 Direct product
family are inductive sensors that are actuated electro-
sensitively by metal. The safe state is the switched off
state (unpowered state: logical "0" on an OSSD).
Using the safety switches in the IN4000 Direct product
family and the related machine or system control, the
positions of moving machines or parts of machines can
be protected such that ...
• the dangerous state of the machine or system can
then only be switched on if these are in the safe
position.
• a stop command is triggered if the safe area or safe
position is left with the machine in operation.
For the control this means that ...
• switch-on commands that result in dangerous states
are then only allowed to become effective if the
moving parts of the machine are in the safe position,
and
• dangerous states must be terminated before the
protective position is left.
Prior to the use of the safety switches, a risk assess-
ment must be performed on the machine in accord-
ance with EN 12 100, safety of machinery, basic
concept.
To determine the function safety (Performance Level
PL, Safety Integrity Level SIL) of the application the
related standards should be used:
• Safety of machinery — Safety-related parts of control
systems (EN ISO 13 849)
• Safety of machinery — Functional safety of safety
related electrical, electronic and programmable
electronic control systems (EN 62 061)
Operating instructions
IN4000 Direct
8012183/WI13/2013-01-15
Subject to change without notice