Yaskawa VS-616G5 Modbus Plus Communication Card - Manual (Page 21)

4-4 Establishing Communications
MB+ Network
A single MB+ network can have up to 64 addressable devices (nodes). Each device requires a
unique node address. One node is allocated for each VS-616G5 drive with its MB+ board
installed. No duplicate node addresses should exist.
Up to 32 nodes can be connected directly to the network bus over a length of 1500 feet (450
meters). Repeater devices can extend the cable distance a maximum of 6000 feet (1800
meters), and node count of 64. If more than 64 devices are to be connected, multiple networks
can be joined through “bridge devices”. Nodes address each other across a bridge device by
specifying routing paths. The routing path is embedded in the control block section of the Modbus
Plus MSTR function block and is sent from the originating node. Modbus Plus message routing is
described in detail under “MSTR Control Block” in Chapter 5.