Machine Safety

​Calculation Examples

 

Only the pneumatic part is described in the form of a subsystem in these examples. Other safety-related components (e.g. protective devices, electrical logic elements) must be added to ensure the safety function is complete.

The examples shown here only relate to the stopping of hazardous movements. In pneumatics, safety measures concerning the interruption of energy sources, the evacuation of potential energy (pressure contained in a part of the circuit), and a “progressive” start-up after an unexpected shutdown should not be omitted.

Actuators (pneumatic cylinders) are not taken into consideration in the calculation of performance levels (PL). Since actuators are not an integral part of the control systems, they do not fall under EN ISO 13849-1 requirements. Manufacturers are, however, required to integrate the risks related to a failure of the actuator into their risk evaluation (EN ISO 14121 and EN ISO 12100).

To attain a PL = c, category 1 architecture

To attain a PL = c, category 1 architecture

To attain a PL = c, category 2 architecture

To attain a PL = c, category 2 architecture

To attain a PL = d, category 3 architecture

To attain a PL = c, category 3 architecture

To attain a PL = d, category 3 architecture

To attain a PL = c, category 3 architecture