6 safety manual – JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual User Manual
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Table 3: Terms and abbreviations according to DIN EN 61508 and DIN EN 61511
Name
Description
Actuator
Part of a safety instrumented system that intervenes in the process to achieve a safe
state.
EUC
EUC (equipment under control)
Equipment, machine, apparatus, or plant used for manufacturing, shaping materials, for
transport, medical purposes, or other activities.
E / E / PE
Electrical/electronic/programmable electronic (E/E/EP):
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 dangerous hardware failures due to the use of
automatic diagnostic tests.
Error
A non-normal 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
correct function of the E/E/EP safety-relevant system, safety-relevant systems based
on 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
A failure with the potential of placing the safety-related system in a dangerous state or a
state without functional capability.
Safe failure
A failure without the potential of placing the safety-related system in a dangerous state
or state without functional capability.
Hazard
Potential source of damage
Security
Absence of unjustifiable risks