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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)
Содержание S800 I/O
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