FCI
F
R
P
T1/T2
DU (both)
PR (primary)
PR (backup)
I/O module
F
R (AI, DI)
R (AO, DO)
W (AI, DI)
W (AO, DO)
Power up
S800 I/O
Avt
r !" Qr
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yyr
3BSE 020 923R101
INIT
in FCI
Brr
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Qr
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Start of I/O
133