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The safety related control system can be in the form of a safety relay or a safety plc, where the control system will respond to inputs and give defined outputs.
Components that give these signal states include; safety inputs such as, emergency stops, interlock switches, light curtains and laser scanners and the safety outputs could be a pneumatic dump valve, a contactor or a drive.
To ensure that the components used within the safety control system are sufficient for their reliability, safety calculations must be completed. These calculations begin with a target performance level defined from the risk assessment for the safety control system.
From here, with the use of the reliability data, the calculations can be completed with the performance level being calculated. A comparison of the target performance level versus the calculated performance level can then be done. If the calculated performance level is equal to or greater than the target level, the safety calculations are compliant. Should they fail, where the calculated performance level is less than the target performance level, investigation is required to see how to meet compliance.
ISO 13849-1:2015 offers safety criteria and guidelines on principles for designing and integrating safety-related control system components (SRP / CS), including software design.