JUMO dTRANS T06 - Terms and Abbreviations According to Standards Series DIN en ISO 13849

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6.7.1 Terms and abbreviations according to standards series DIN EN ISO 13849
Formula symbol or ab-
breviation
Description Definition
or location
PL (a, b, c, d, e) Designation for the performance level Table 3 in DIN
EN ISO13849-1
AOPD Active opto-electronic protective device (e.g. light barrier) Annex H
B, 1, 2, 3, 4 Designation for the categories Table 7
B
10d
Number of cycles in which a dangerous failure occurred in 10 % of a random
sample of the observed pneumatic or electromechanical components that are
subject to wear (mean time to dangerous failure)
Annex C
Cat. Category 3.1.2
CC Current converter Annex I
CCF Common cause failure 3.1.6
DC Diagnostic coverage 3.1.26
DC
avg
Average diagnostic coverage E.2
MTTF Mean time to failure Annex C
MTTF
c
Mean time to critical failure 3.1.25
MTTF
d
Mean time to dangerous failure
n, N, N
Number of units 6.3, D.1
N
low
Number of SRP/CS with PL
low
in an SRP/CS combination 6.3
PL Performance level 3.1.23
PLC Programmable logic controller Annex I
PL
low
Lowest performance level of an SRP/CS in an SRP/CS combination 6.3