Allen-Bradley controllogix 1756-L55M12 User Manual page 38

38 Communicate over Networks
Publication 1756-UM001G-EN-P - January 2007
ControlLogix DH-485 Network Communication Overview
1761-NET-AIC+
Converter
DH-485 Network
On the DH-485 network, the ControlLogix controller can send and
receive messages to and from other controllers.
A DH-485 network consists of multiple cable segments. Limit
IMPORTANT
the total length of all the segments to 1219 m (4000 ft).
For the controller to operate on a DH-485 network, you need a
1761-NET-AIC interface converter for each controller you want to put
on the DH-485 network.
You can have two controllers for each 1761-NET-AIC converter, but
you need a separate cable for each controller. Connect the serial port
of the controller to either port 1 or port 2 of the 1761-NET-AIC
converter. Use the RS-485 port to connect the converter to the DH-485
network.
Cable Selection
Connection
Port 1
DB-9 RS-232, DTE connection
Port 2
Mini-DIN 8 RS-232 connection
ControlLogix Controller
Connection from ControlLogix
Controller to Port 1 or Port 2
1747-AIC
Programmable
Controller Isolated
Link Coupler
SLC 5/03 Controller
Required Cable
1747-CP3
or
1761-CBL-AC00
1761-CBL-AP00
or
1761-CBL-PM02