Siemens SIMOCODE pro

List of abbreviations
A.1 List of abbreviations
106
SIMOCODE pro - Fail-Safe Digital Modules
Manual, 11/2017, NEB631679702000/RS-AA/002
Abbreviation
Meaning
PFDavg
Average probability of dangerous failure of a safety function on demand
PFHD Probability of dangerous failure per hour
PL
Performance Level
PCS Process Control System
ProdIS
Product Information System
PZ
Pozidriv
RTU
Remote Terminal Unit
SELV
Safety Extra Low Voltage
SF
Group error
SIL
Safety Integrity Level
PLC
Programmable controller
TIA
Totally Integrated Automation
TN
Terre-Neutre (ground neutral)
TT
Terre-Terre (ground-ground)
T
OFDT
Total one fault delay time (maximum response time when error is present)
T
WCDT
Total worst case delay time (maximum response time in error-free state)