Safety Functions
If risk minimization cannot be achieved through design measures alone, then the use of safety-relevant control parts and a corresponding definition of safety functions is required. The appropriate safety functions are selected according to the application and required safeguard. The determination of safety-related functions and their implementation is fully described in the international standards EN ISO 13849 and IEC 62061.
In the following you will find the most commonly safety functions with relevant group standards.
Safety Functions | Default | |
 | Emergency Stops | EN ISO 13850 |
 | Monitoring moveable guards with guard door monitoring without interlock/guard locking | EN 1088 |
 | Monitoring moveable guards with guard door monitoring with interlock/guard locking | EN 1088 |
 | Monitoring open hazardous area with light curtain | EN ISO 13855 IEC 61496-1/2 |
 | Monitoring open hazardous area with light curtain with muting function | EN ISO 13855 IEC 61496-1/2 |
 | Safe operation with two-hand control | EN 574 |
 | Ensuring safe setting with operating mode selector switch | IEC 60204-1 |
 | Zero speed monitoring | IEC 60947-4-1 |
 | Overspeed monitoring | IEC 60204-1 |
 | Safe Torque Off-STO | IEC 61800-5-2 |
 | Preventing restarts | IEC 60204-1 |
 | Monitoring of externally connected actuators via feedback circuits | IEC 60204-1 |
 | Preventing unexpected startup | EN 1037 |
 | Protection against electric shock | EN ISO 12100-1/2 |
The parts of machine control systems that handle safety tasks are defined in international standards as the “safety-related parts of control systems” (SRP/CS). These parts can consist of hardware or software and can be separate or integrated elements of the machine control system.
Safety-related parts of control systems each incorporate the entire functional chain of a safety function, consisting of the input level (sensor), the logic (safe signal processing), the output level (actuator) and the communication system between all control parts or sub-elements.
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