P 8 Posts in this encyclopedia category
Performance Level (PL)
Discrete level for safety-related performance. PL "a" is the lowest, PL "e" the highest level. [EN ISO 13849-1]
Periodic test
The periodic test for ESPE type 2 simulates the response of the sensor part in order to detect a dangerous failure. It is prescribed for the verification of the function of ESPE type 2 according...
Position switch
Position switch is part of the interlocking device of a guard. It changes its switching state depending on a mechanically given control command. There are position switches without and with guard...
Probability of Failure dangerous per Hour (PFHd)
Probability of Failure dangerous per Hour or probability of a dangerous failure per hour. The failure limit value PFD is determined for small demand rates, while the failure limit value PFH...
Probability of Failure on Demand (PFD)
Probability of Failure on Demand or average probability that the safety function will not be executed on demand.
Proximity Devices with defined behaviour under Fault conditions (PDF)
PDF is a proximity switch for safety functions with defined behaviour under fault conditions (PDF), in which a switching operation is triggered by a change in optical, magnetic, electrostatic,...
Test voltage
The test voltage indicates the dielectric strength between coil and contact, e.g. 4 KV.