AXL F SSDO8/3 1F
42
PHOENIX CONTACT
106888_en_01
Category
The categories are achieved with the following measures:
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
Make sure that a single error does not result in the loss of the
safety function.
x
Test the shutdown capability of the actuators at regular
intervals for test pulses that are disabled.
x
x
An accumulation of errors must not result in the loss of the
safety function. Following the third error, evaluation can be
aborted if the probability of further errors occurring is low.
x
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