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Installation instructions
│
T24
│
Chapter 3: Functional safety
M easu res f or probabil ity of hardware f ail u res
Measure
System based on…
T24 + R20
T24 + R21
Probability of dangerous failure per
hour
PFH = 39 FIT
PFH = 28 FIT
Diagnostic coverage
DC = 99%
DC = 99%
Safe failure fraction
SFF = 99%
SFF = 99%
Level of hardware fault tolerance
HFT = 1
HFT = 1
Proof test interval
10 years
10 years
Diagnostic test interval
Continuous
Continuous
1 FIT = 1 failure/ 10
9
h
16
IM-PM-TX101-EN-v08