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18 Glossary
26
ESR5-NV3-300
12/19 MN049006EN
www.eaton.com
18 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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