9 Glossary
16 ESR5-NO-21-24VAC-DC 12/19 MN049007EN www.eaton.com
9 Glossary
Abbreviation Explanation
AOPD Active optoelectronic protective device
Device with a sensor function that is generated by optoelectronic transmit and receive
elements, which detects the interruption of optical radiation generated in the device by an
opaque object located in the specified protective field (or for a photoelectric barrier on the
axis of the light beam).
In DIN EN 692 (mechanical presses), DIN EN 693 (hydraulic presses), and EN 12622
(hydraulic trimming presses), the abbreviation AOS is used as a synonym for AOPD.
AOPDDR
Active optoelectronic protective device responsive to diffuse reflection
Device with a sensor function that is generated by optoelectronic transmit and receive
elements, which detects the diffuse reflection of optical radiation generated in the device
by an object located in a protective field specified in two dimensions.
Cat. / Category
Classification of the resistance to faults according to EN ISO 13849-1.
CCF
Common cause failure
DC Diagnostic coverage
ESPE Electro-sensitive protective equipment
Mission Time T
M
Duration of use
MTTF / MTTF
d
Mean time to failure / mean time to dangerous failure
PFD Probability of failure on demand (low demand)
PFH
d
Average frequency of a dangerous failure per hour
PL Performance level
Classification of the ability of safety functions to meet a safety demand
SIL
Safety integrity level
SILCL SIL claim limit
SRCF Safety-related control function
SRECS Safety-related electrical control system
(Safety-related electrical, electronic, and programmable electronic control system)
SRP
Safety-related part
SRP/CS Safety-related parts of control system
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