| 摘要 |
PCT No. PCT/JP96/02939 Sec. 371 Date May 30, 1997 Sec. 102(e) Date May 30, 1997 PCT Filed Oct. 9, 1996 PCT Pub. No. WO97/14083 PCT Pub. Date Apr. 17, 1997A distribution board includes wiring and connectors removably attaching a plurality of I/O units. These I/O units include transmitter-receiver units. When the I/O units are attached to one or more of the connectors on the distribution board, the attached I/O units and the wiring provided on the distribution board are connected to one another.
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