Electrical Installation
‑155‑
Table 7–22 Cable pin connections for communication between PLC and the AC drive
AC Drive PLC
Communica
tion Type
Signal Description
Communica
tion Type
Signal Description
RS485
RS485+
RS485 signal
(+)
RS485
RS485+
RS485 signal
(+)
RS485‑
RS485 signal
(‑)
RS485‑
RS485 signal
(‑)
CGND
Signal
reference
ground
CGND
Signal
reference
ground
‑
PE (shield)
Enclosure
‑
PE (shield)
Enclosure
RS485 communication connection for multiple AC drives in parallel
The following table specifies the cable pin connections for multiple AC drives in
parallel in RS485 communication networking.
Table 7–23 Cable pin connections for communication between multiple AC drives in
parallel
AC Drive (Side A) AC Drive (Side B)
Communica
tion Type
Signal Description
Communica
tion Type
Signal Description
RS485
RS485+
RS485 signal
(+)
RS485
RS485+
RS485 signal
(+)
RS485‑
RS485 signal
(‑)
RS485‑
RS485 signal
(‑)
CGND
Signal
reference
ground
CGND
Signal
reference
ground
‑
PE (shield)
Enclosure
‑
PE (shield)
Enclosure
Communication networking
Use the daisy chain topology for the RS485 bus in the case of a large number of
nodes, as shown in the following figure. Ensure that the RS485 signal reference
ground of all nodes are connected together. A maximum of 128 nodes can be
connected.
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