ABB S800 I/O - DP820 Module Details

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