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A Appendix
A 1 Explanation of terms
AOPD Active optoelectronic protective device
Device with a sensor function that is generated by optoelectronic transmit and receive ele-
ments, 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 ele-
ments, which detects the diffuse reflection of optical radiation generated in the device by an
object located in a protective field specified in two dimensions.
ESPE Electro-sensitive protective equipment
CCF Common cause failure
DC Diagnostic coverage
PL Performance level
Classification of the ability of safety functions to meet a safety demand
Cat. / Category Classification of the resistance to faults according to EN ISO 13849-1.
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
SIL Safety integrity level
SILCL SIL claim limit
SRCF Safety-related control function - safety function
SRECS Safety-related electrical control system
(Safety-related electrical, electronic, and programmable electronic control system)
SRP / SRP/CS Safety-related part / safety-related parts of control systems
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