Electrical Design
‑83‑
Bus topology
The CAN bus supports a maximum of 63 nodes (excluding the master). The following
figure shows the networking. Set the termination resistors of the master and the last
node to ON.
Figure 3‑27 Networking diagram
Bus transmission distance
The transmission distance of CAN bus is directly dependent on the baud rate and
communication cable. The following table shows the mapping between the maximum
transmission distance of CAN bus and the baud rate.
No.
Transmission
Distance
Rate
Number of Nodes Cable Diameter
1 25 m
1 Mbps
64 0.34 mm
2
2 95 m
500 kbps
64 0.34 mm
2
3 560 m
100 kbps
64 0.50 mm
2
4 1100 m
50 kbps
64 0.75 mm
2
3.5.1.3 Overview
MD580‑SI‑CAN1 is a new‑generation fieldbus adapter module of Inovance. It is used
together with the MD580 series AC drive to realize networking and remote control of
the transmission system through the CANopen fieldbus communication network.
Features:
● With the Node Guard protocol supported, the master can read equipment status.
● With the Heartbeat protocol, the slave reports its current status to the master
regularly.
● MD580‑SI‑CAN1 supports transmission of PDO data which is 16‑bit.
● The SDO can be transmitted only via acceleration transmission mechanism. At
most four channel's data can be transmitted per each frame.
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