ABB S800 I/O User Manual page 44

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Each I/O cluster can have a maximum of 12 S800 I/O modules. The maximum
number of S800 I/O modules or other units connected to one FCI is 24. The optical
ring connection or duplex connection allows for a maximum distribution of 15m
(49 ft.) (plastic fiber) or 200m (667 ft.) (HCS fiber) between each I/O cluster, see
example in
34
SERVICE
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Figure 2-9.
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-
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3BSE 020 923R101