Electrical Installation
‑156‑
Figure 7‑57 Daisy chain connection
Figure 7‑58 RS485 bus topology
The maximum allowable number of nodes and transmission distance of a standard
RS485 circuit vary with transmission rates, as listed in the following table.
Table 7–24 Transmission distance and number of nodes
Transmission
Distance (m)
Rate (kbps)
Number of Nodes
Cable Specification
100 115.2 128 AWG 26
1000 19.2 128 AWG 26
7.6.2 CAN Communication Wiring
CAN communication with PLC
Use a three‑conductor shielded cable for the CAN bus. The AC drive comes with three
cables for connection to the CANH, CANL, and CGND terminals. The cables for CANH
and CANL connection are twisted pair cables. For the third cable, the conductor is
connected to the CAN reference ground CGND, and the shield is connected to the
equipment ground. Connect 120 Ω termination resistors only at the head and tail
ends of the bus to prevent CAN signal reflection.
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