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Acronyms
Acronym Meaning
PFD Probability of Failure on Demand.
PFH Probability of Failure per Hour.
MC Memory Cassette.
Si Safety Input.
An input from a Safety Input terminal. This term is used to differentiate from a
Standard Input (IN).
So Safety Output.
An output from a Safety Output terminal. This term is used to differentiate from
a Standard Output (OUT).
To Te s t O u t p u t .
An output from a Test Output terminal used to diagnose a Safety Input terminal
by outputting a test pulse.
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