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Connection examples for safe outputs
105739_en_04 PHOENIX CONTACT
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6.3 Measures to achieve a specific safety integrity
The safety integrity (SIL, SILCL, category, and performance level) that can be achieved is
specified for each connection example.
SIL, SILCL
Performance level
Category The categories are achieved with the following measures:
Use the standard to determine the probability of failure in your application according to
IEC 61508 (SIL) and EN 62061 (SILCL).
Table 6-2 PFD and PFH depending on the SIL/SILCL
Safety integrity PFD PFH
SIL 2/SILCL 2 1% of 10
-2
1% of 10
-6
SIL 3/SILCL 3 1% of 10
-3
1% of 10
-7
Use standard EN ISO 13849-1 to determine the performance level.
Measure Cat. 2 Cat. 3 Cat. 4
Use proven and basic safety principles according to
EN ISO 13849-2.
x x x
Use qualified actuators: see “Requirements for
actuators/controlled devices” on page 15.
x x x
Please note that mechanical failure of the switching device can
result in the loss of the safety function.
x x x
Prevent the welding of contacts on the connected contactors or
safety relays with protection against overcurrent and surge
voltage.
x x x
Please note that a single error can result in the loss of the safety
function between tests.
x
Make sure that the external wiring is tested by the machine
controller on machine startup and at suitable intervals. This test
must detect the loss of the safety function.
x
Make sure that in the event of an error the module shuts down
safely or generates a warning (optical and/or audible)
depending on the application.
x
Please note that all errors that cannot be detected can result in
the loss of the safety function. Take measures to prevent these
errors (e.g., protected cable installation or double insulation).
Observe the notes in the following tables.
x x
Please take into consideration errors with a common cause. x x