Phoenix Contact Axioline F, User Manual, Page: 37 / 86

Connection examples for safe outputs
105739_en_04 PHOENIX CONTACT
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6 Connection examples for safe outputs
6.1 Explanation of the examples
If the settings do not contradict one another, the outputs of a module can achieve different
safety integrity levels (SIL, SILCL, Cat., PL) simultaneously.
The examples only describe the options for the electrical connection of controlled
devices/actuators to the safe outputs.
Should you have any questions regarding your applications, please contact the
Phoenix Contact safety hotline: see Section 1.8 “Safety hotline” on page 12.
WARNING: Loss of safety function
Improperly executed applications can result in the loss of the safety function.
• Observe the information to achieve the specified safety integrity: see Section 6.3
“Measures to achieve a specific safety integrity” on page 39.
• Make sure that the actuator has appropriate diagnostic coverage and an appropriate
MTTFd to achieve the specified PL.
For applications according to PL d, high diagnostic coverage (> 99%) is
recommended, however medium diagnostic coverage (90% to 99%) and a medium
MTTFd are required at the very least.
For applications according to PL e, high diagnostic coverage (> 99%) and a high
MTTFd are required.
• Use actuators that can achieve the required safety integrity.
• Evaluate the readback contacts to achieve Cat. 3 or Cat. 4.
WARNING: Loss of safety function
Improperly executed applications can result in the loss of the safety function.
• Prevent the supply of an external voltage in an output (e.g., due to cross-circuits).
• Install the connecting cables for the actuators so that they are protected against
cross-circuits.
• Observe the load-carrying capacity of the outputs: see Section 2.4 “Safe digital
outputs” on page 15.
NOTE: Damage to equipment
Incorrect supply of an external voltage can damage the module.
• Prevent the supply of an external voltage in an output (e.g., due to cross-circuits).
• For the examples, please also observe the measures specified in the tables as well as
standards IEC 61508, EN 62061, and EN ISO 13849-1 to achieve the specified
SIL/SILCL/Cat./PL.
The above notes apply in general for all of the connection examples in this section.
• Also observe the notes listed in the individual connection examples.