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The Performance Level (PL) is the assessment of the performance level of safety function under certain known conditions.

The safety function is a function of the machine or a device that is intended to protect a part of it and which, if it fails, can cause an immediate increase in risk.
It specifically refers to a signal transmitted and managed by a PLC (preferably dedicated) to manage safety functions. It is necessary to take into account these functions in order to pursue the objective of eliminating/reducing as much as possible the risk of potentially harmful situations for the operator.

Through the Performance Level, the safety level of a component from an electrical/electronic point of view is expressed through five Performance Levels, identified with letters in ascending order from A to E as the level of risk increases: a PL “e” refers to a High safety level, a PL “c” to a Medium-high safety level, a PL “a” to a significantly poor safety level.

IMPORTANT

Each level refers to an average probability of dangerous failure per hour, which means that a component with a “a” PL level has a very high chance of a hazardous event occurring