Mitsubishi Electric AJ65BT-RPI-10A User Manual page 21

(1) What is a repeater?
This is the module for expanding the CC-Link system by connecting
the segments to each other.
(2) What is a segment?
In the CC-Link system where repeaters are used, the equipment
included between terminating resistances connected to each other
through cross-over cables is generally called the segment.
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