ABB S800 I/O User Manual page 140

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F (fault)
R (run)
W (warning)
O (osp only outputs)
Power up of backup FCI in a running system
See timing diagram
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Primary
F (fault)
R (run)
P (pow ok)
T1
T2
PR
DU
Backup
F (fault)
R (run)
P (pow ok)
T1
T2
PR
DU
130
"on" at power up and "off" after the first access from
the FCI
"off" at power up and "on" for AI, DI after
configuration and for AO,DO after configuration and
commanded operational from the controller
"off" at power up and after the module operational
updated from the module
"off" at power up and after module is operational
it is handled by the module
Figure 2-5.
"off"
"on"
"on"
"on"
"on"
"on"
"off" (on when the backup is running)
"off"
"off" (on when the backup is running)
"on"
"on"
"on"
"off"
"off" (on when the backup is running)
3BSE 020 923R101