ABB S800 I/O User Manual page 142

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FCI
F
R
P
T1
T2
PR (primary)
DU (both)
PR (backup)
R (backup)
I/O module
F
R (AI, DI)
R (AO, DO)
W (AI, DI)
W, OSP (AO, DO)
Power up
S800 I/O
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132
INIT
in FCI
FCI operational
Start of I/O
INIT INIT
backup
3BSE 020 923R101