Abbreviations; Viewing Angles - B&R Panel PC 2100 User Manual

A.2 Abbreviations
Abbreviation
NC
ND
NO
TBD
B
10D
MTTF
D
DC
PL
PFH
SIL
A.3 Viewing angles
For the viewing angle values of display types (R, L, U, D), see the technical data of the individual components.
Panel PC 2100 user's manual V1.17
Stands for
Normally closed
Not connected
Not defined
Normally open
To be defined
-
Mean time to dangerous failure
Diagnostic coverage
Performance level
Probability of failure per hour
Safety integrity level
Table 291: Abbreviations used in this user's manual
L
D
6 o'clock direction
Description
Normally closed relay contact.
Used in pinout descriptions if a terminal or pin is not connected on the module
side.
In technical data tables, this stands for a value that is not defined. This may
be because a cable manufacturer does not provide a value for certain technical
data, for example.
Normally open relay contact.
Used in technical data tables when there is currently no value for specific tech-
nical data. The value will be provided at a later point in time.
Number of cycles before 10% of the components have experienced hazardous
failure (per channel).
Average time before hazardous failure occurs (per channel).
Diagnostic coverage
Discrete level that specifies the ability of safety-related devices to perform a safe-
ty function under foreseeable conditions.
Probability of failure per hour.
Safety integrity level
U
R
Appendix A
329