ABB S800 I/O User Manual page 89

The connector style, either simplex or duplex, all provide snap-in action when
mated to the X4/X5 ports. Simplex connectors are color coded to facilitate
identification of transmitter (Tx) or receiver (Rx) connections. Duplex connectors
are keyed so that proper orientation is ensured during insertion.
Figure 3-8
ModuleBus. Duplex (two-way) is normally the best communication design, but may
not apply to all requirements. Duplex design allows additional TB820s to be added
down-stream on-line.
Simplex (one-way) connections provide a ring configuration from the FCI to the
first TB820, to the next TB820 and etc. and then back to the FCI. Simplex designs
will require that the "home-run" cable from the last TB820 back to the FCI, or
another TB820, be limited to the 15 meter (49 ft.) plastic fiber or 200 meter (667 ft.)
HCS fiber cable length. The 15 meter (49 ft.) cable length or 200 meter (667 ft.)
maximum applies from FCI to TB820, to TB820, etc. and back to the FCI.
3BSE 020 923R101
TB820
L+ L+ SA
L- L- SB
X4
Rx
Tx
Rx
X4
Tx
Rx
X5
Tx
Front View
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shows a duplex, simplex and mixed configuration of the optical
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Trp‡v‚Ã" 
Optical ModuleBus
Interface Connectors
X5
(X4, X5)
Rx
Tx
Duplex Fiber Optic Cable Connector
Simplex Fiber Optic Cable Connector
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