6 Safety Manual
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6.5.1 Terms and abbreviations according to DIN EN 61508 and DIN EN 61511.
Name Description
Actuator Part of a safety-related system that intervenes in the process to achieve a safe state.
EUC EUC (equipment under control)
Equipment, machine, apparatus, or system used for manufacturing, shaping materials, for
transport, medical purposes, or other activities.
E/E/PE Electrical/electronic/programmable electronic (E/E/PE):
based on electrical (E) and/or electronic (E) and/or programmable electronic (PE)
technology
Failure End of the ability of a functional unit to perform a required function.
Diagnostic coverage Partial reduction in the probability of critical hardware failures due to the use of automatic
diagnostic tests.
Error An abnormal condition that can cause a reduction or the loss of the ability of a functional
unit to perform a required function.
Functional safety A part of overall safety related to the EUC and EUC control system that depends on the
proper function of the E/E/EP safety-relevant system, safety-relevant systems of other
technology, and external equipment for risk reduction.
Functional unit Unit consisting of hardware or software or both that is suitable for performing a specified
task.
Dangerous failure Failure of an element and/or subsystem, and/or system involved in implementing the safety
function, which
a) prevents the safety function being executed on demand (on-demand operation type), or
causes the failure of a safety function (operation with continuous demand), so that the EUC
transitions to a dangerous or potentially dangerous state; or
b) reduces the probability of executing the safety function correctly on demand.
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