Rockwell Automation 1769-L23E-QB1B_L23E-QBFC1B_L23-QBFC1B CompactLogix Packaged Controllers Quick Start and User Manual - Manual (Page 184)

184 Publication IASIMP-QS010B-EN-P - October 2009
Chapter 2 Network Communication
DH-485 Network
Communication The serial ports of CompactLogix packaged controllers are also able to
communicate by using DH-485 protocol. By using a 1761-NET-AIC converter
and the appropriate RS-232 cable (catalog numbers 1756-CP3 or 1747-CP3), a
CompactLogix controller can send and receive data on a DH-485 network.
However, with all CompactLogix controllers, we recommend that you use
NetLinx networks, such as EtherNet/IP or DeviceNet, because excessive
traffic on a DH-485 network may make it impractical to connect to a
controller with RSLogix 5000 programming software.
The DH-485 protocol uses RS-485 half-duplex as its physical interface. RS-485
is a definition of electrical characteristics, not a protocol. You can configure
the CompactLogix controller’s RS-232 port to act as a DH-485 interface.
This graphic depicts how the CompactLogix packaged controller can be
connected to the DH-485 network.
CompactLogix DH-485 Communication Network Example
IMPORTANT
If your application uses connections to DH-485 networks, select
built-in serial ports.
1747-C10
1747-CP3 Cable
or
1761-CBL-AC00 Cable
‹
1761-NET-AIC+
Converter
1747-AIC
Converter
SLC 5/03 Controller
DH-485 Network