C-2 RS485 (DSI) Protocol
PowerFlex 4M Adjustable Frequency Drive FRN 1.xx - 2.xx User Manual
Publication 22F-UM001D-EN-E
Only pins 4 and 5 on the RJ45 plug should be wired. The other pins on
the PowerFlex 4M RJ45 socket contain power, etc. for other Rockwell
Automation peripheral devices and must not be connected.
Wiring terminations on the master c
ontroller will vary depending on the
master controller used and “TxRxD+” and “TxRxD-” are shown for
illustration purposes only. Refer to the master controller’s user manual
for network terminations. Note that there is no standard for the “+” and
“-” wires, and consequently Modbus device manufacturers interpret
them differently. If you have problems with initially establishing
communications, try swapping the two network wires at the master
controller.
Standard RS485 wiring pr
actices apply.
• Termination resistors need to be applied at each end of the network
cable.
• RS485
repeaters may need to be used for long cable runs, or if
greater than 32 nodes are needed on the network.
• Netw
ork wiring should be separated from power wires by at least 0.3
meters (1 foot).
• Netw
ork wiring should only cross power wires at a right angle.
Control Terminal 16 on the PowerFlex 4M must also be connected to PE
gro
und (there are two PE terminals on the drive). See
Figure 1.5 for more
information.
Network Common is internally tied to I/O Terminal 04 (Digital
Common). Tying I/O Terminal 04 to PE ground may improve noise
immunity in some applications.
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