Safety Data for Safety I/O Module

The Digital Safety Parameter Data tables list calculated values for probability of a dangerous failure on demand (PFD), average frequency of a dangerous failure per hour (PFH), and mean time to failure (MTTF). PFD and PFH calculations comply with IEC 61508, edition 2010.

PFD and PFH must be calculated for the devices within the system to comply with the SIL level that is required for application.

You must be responsible for following the requirements of ISO 13849-1:2023, to assess Performance Levels in their safety system.

You must validate the system functionality before starting operation. You are responsible for making sure that the system meets what is indicated in your Safety Requirement Specification. You can validate the system functionality as follows:

You must functionally test every I/O module by individually toggling each input point and also verify that the controller detects it within the safety reaction time (SRT).
You must individually toggle each output point by the controller and verify that the output point changes state.

For more information, see the safety controller manuals that are listed in Additional Resources.