Rockwell Automation Publication 520-QS001A-EN-E - March 2014 33
PowerFlex 520-Series Adjustable Frequency AC Drive
Network Communication
PowerFlex 520-Series RS784 (DSI) Protocol
This section contains only basic information to setup the PowerFlex 520-series RS485 (DSI) protocol connection with
your PowerFlex 520-series drive. See the PowerFlex 520-Series Adjustable Frequency AC Drive User Manual, publication
520-UM001
for more information.
PowerFlex 520-series drives support the RS485 (DSI) protocol to allow efficient operation with Rockwell Automation
peripherals. In addition, some Modbus functions are supported to allow simple networking. PowerFlex 520-series drives
can be multi-dropped on an RS485 network using Modbus protocol in RTU mode.
PowerFlex 520-Series Drive Network
Network Wiring
Network wiring consists of a shielded 2-conductor cable that is daisy-chained from node to node.
Network Wiring Diagram Example
ATTENTION: Never attempt to connect a Power over Ethernet (PoE) cable to the RS485 port. Doing so may damage the circuitry.
The shield is connected at ONLY ONE end of each cable segment.
Controller PowerFlex 520-Series Drives
C1 C2
Master
4
5
TxRxD-
TxRxD+
TxRxD-
TxRxD+
TxRxD-
TxRxD+
Shield Shield Shield
120 ohm resistor
120 ohm resistor
X X X
FRONT
PIN 8PIN 1
TxRxD-
TxRxD+
RS485
(DSI)
AK-U0-RJ45-TB2P
V/T2T/L3S/L2R/L1 U/T1 W/T3
BR+
BR-
DC-
DC+
C1 C2
TxRxD-
TxRxD+
RS485
(DSI)
V/T2T/L3S/L2R/L1 U/T1 W/T3
BR+
BR-
DC-
DC+
PowerFlex 525
Node 1
4
5
PowerFlex 523
Node 2
4
5
PowerFlex 525
Node “n”
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