Siemens SIRIUS Configuration Manual page 59

Abbreviation
CET
NC
PDF
PE
SELV
PFD
UL
NO
SIL
VDE
Cable-operated switches and foot switches
Configuration Manual, 09/2020, A5E43902195002A/RS-AA/001
Meaning
Central European Time
NC contact
Platform-independent file format for documents (Portable Document Format)
Protective Earth
Safety extra-low voltage
Probability of dangerous failure on demand
Underwriters Laboratories Inc.
U.S. organization for certifying electrotechnical products.
NO contact
Safety Integrity Level
Verband der Elektrotechnik Elektronik Informationstechnik e. V. (Association of
Electrical Engineering, Electronics and Information Technology (Germany))
Appendix
A.2 List of abbreviations
59