Electrical Design
‑83‑
3.3 Communication Wiring
3.3.1 RS485 Communication Wiring
RS485 communication connection with PLC
Connect the RS485 bus using three‑core shielded cables. Three cables are required for
connecting this product to the 485+, 485‑, and GND terminals. Twisted pair shielded
cables must be used to connect 485+ and 485‑. The twisted pair is connected to 485
+/485‑, and the shielding layer is connected to GND.
Table 3–34 Pin connection relation of the communication cable between the AC drive and
PLC
AC drive
PLC
Communication
Type
Signal
Communication
Type
Signal
RS485 485+ RS485 485+
485‑ 485‑
GND GND
RS485 Communication Connection for Multi-drive Applications
The following tables describes the cable connection between multiple AC drives
during RS485 communication networking.
Table 3–35 Pin connection relation of the communication cable for parallel connection
AC Drive (A Side) AC Drive (B Side)
Communication
Type
Signal
Communication
Type
Signal
RS485 485+ RS485 485+
485‑ 485‑
GND GND
The daisy chain mode is required for RS485 bus connection of a large number of
nodes, as shown in the following figures. The RS485 signal reference ground of all
nodes must be connected together. Up to 128 nodes can be connected.
Figure 3‑20 RS485 bus topology
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