Hitachi IR.Station, Hardware Manual

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5 CABLING
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5.2.1 Inhibited wiring
Improper wiring may cause signal waveforms on the line to be disturbed and a transmission
error.
Inhibited wiring (Examples)
Good wiring
CPU unit
A maximum of 31 units can be connected to one line and units at both
ends of the line must be terminated.
Termination
Do not branch the line.
Connect cables directly. Do not use a terminal block (TB).
TB
TB TB TB
Do not use cables of different sizes and ampacities on an identical line.
IR.Station IR.Station IR.LINK
IR.Station IR.Station IR.LINK
IR.Station IR.Station IR.LINK IR.Station
IR.Station IR.Station IR.LINK IR.Station
I/O unit I/O unit I/O unit
CPU unit I/O unit I/O unit I/O unit
CPU unit
I/O unit I/O unit
CPU unit I/O unit I/O unit
Termination