AXL F SSDO8/3 1F
16
PHOENIX CONTACT
106888_en_01
Disabling the test pulses affects the error detection of the module.
•
Observe the achievable safety integrity: see Section 6 “Connection examples for safe
outputs” on page 39.
•
Observe the notes on the safe assignment of outputs: see Section 6.4 “Single-channel
assignment of safe outputs” on page 43, see Section 6.5 “Two-channel assignment of
safe outputs” on page 45.
2.5
Connection options for actuators depending on
the parameterization
Actuators that meet various safety requirements depending on the parameterization can be
connected to the outputs.
The maximum achievable SIL/SILCL/Cat./PL is specified in the table.
In order to meet the safety requirements:
•
Observe the information in the connection examples: see Section 6 “Connection
examples for safe outputs” on page 39.
•
Observe the requirements of the standards with regard to the external wiring and the
actuators to be used to achieve a SIL/SILCL/Cat./PL: see Section 6.3 “Measures to
achieve a specific safety integrity” on page 41.
WARNING: Unintentional machine startup
Reactions from test pulses can cause unintentional machine startup.
•
If the process does not tolerate this behavior, the following measures must be taken:
–
Use actuators with sufficient inertia.
–
Make sure that the load is not so dynamic that it causes hazardous states within
1 ms.
Quick actuators which offer a safety-related response to pulses in under 1 ms are not
generally permitted.
Output OUT0 to OUT3
“Output” parameterization
Single-channel
Two-channel
Test pulses
Any
On/off*
Achievable safety integrity
SIL 2/SILCL 2/Cat. 3/PL d
SIL 3/SILCL 3/Cat. 4/PL e
For connection example, see
page
43
45
* If the test pulses are disabled, a cross-circuit between the outputs is only detected
if the output is enabled.
To achieve Cat. 3, two-channel actuators are usually used.
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