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Connection examples for safe outputs
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6.3 Measures required to achieve a specific safety in-
tegrity level
The safety integrity (SIL, SILCL, performance level, and category) that can be achieved is
specified for each connection example.
SIL, SILCL
When the SIL/SILCL is specified, the module takes up 1% of the specified SIL/SILCL.
Performance level
Category In order to actually achieve the specified category, the required measures listed below must
be implemented.
Cat. 2
– Use proven safety principles.
– Use appropriately qualified actuators (see Section “Requirements for controlled devic-
es/actuators” on page 21).
– Please note that mechanical failure of the switching device can result in the loss of the
safety function.
– Prevent the welding of contacts on the connected contactors or safety relays with ap-
propriate protection against overcurrent and surge voltage.
– Please note that a single error can result in the loss of the safety function between tests.
– Make sure that the external wiring is tested by the machine control system on machine
startup and at suitable intervals. This test must detect the loss of the safety function.
– In the event of an error, either safe disconnection must be implemented or a warning
(optical and/or audible) must be generated depending on the application.
In order to determine the probability of failure according to EN 61508 (SIL), use the spec-
ifications from the INTERBUS-Safety system user manual or the standard.
In order to determine the probability of failure according to EN 62061 (SILCL), use this
standard.
Table 6-3 PFD and PFH depending on the SIL/SILCL
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.