Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual - Manual (Page 189)

Rockwell Automation Publication 520-UM001G-EN-E - September 2014 189
Appendix
C
RS485 (DSI) Protocol
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
For information regarding EtherNet/IP or other communication protocols, refer
to the appropriate user manual.
Network Wiring Network wiring consists of a shielded 2-conductor cable that is daisy-chained
from node to node.
Network Wiring Diagram Example
Controller
Esc Sel Esc Sel Esc Sel Esc Sel
ATTENTION: Never attempt to connect a Power over Ethernet (PoE) cable to the
RS485 port. Doing so may damage the circuitry.
IMPORTANT The shield is connected at ONLY ONE end of each cable segment.
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 8 PIN 1
TxRxD-
TxRxD+
RS485
(DSI)
AK-U0-RJ45-TB2P
V/T2 T/L3 S/L2 R/L1 U/T1 W/T3
BR+
BR- DC- DC+
C1 C2
TxRxD-
TxRxD+
RS485
(DSI)
V/T2 T/L3 S/L2 R/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”