Allen-Bradley ControlLogix User Manual

1756-6.5.3 - December 1999
A-4 Allocating Communication Connections
In this example, the owner controller communicates with all the digital I/O
in the remote chassis but uses only one connection. The data from all three
modules is sent together simultaneously at a rate specified by the
1756-CNB connection. This option eliminates the need for the three
separate connections shown in the previous example.
The local controller in this example uses these bidirectional connections:
The rack optimized connection conserves ControlNet connections and
bandwidth, but it limits the status and diagnostic information that is
available from the I/O modules.
Using a Rack Optimized Connection with I/O in a Remote Chassis
Local chassis Remote chassis
I
N
P
U
T
I
N
P
U
T
O
U
T
P
U
T
Rack optimized
connection for all I/O
ControlNet
41021
I
N
P
U
T
O
U
T
P
U
T
Owner Logix 5550
ControlNet
ControlNet
Interface module
Interface ModuleController
Connection Type Module Quantity Connections
per Module
Total
Connections
Logix5550 controller to local I/O module 2 1 2
Logix5550 controller to remote 1756-CNB module 1 1 1
total
3

Allen-Bradley ControlLogix Specifications

General

Communication	EtherNet/IP, ControlNet, DeviceNet, DH+
I/O Capacity	Up to 128, 000 I/O points (varies by configuration)
Redundancy	Supported (with specific modules)
Programming Software	Rockwell Automation Studio 5000 Logix Designer
Operating Temperature	0°C to 60°C (32°F to 140°F)
Programming Languages	Ladder Logic, Function Block Diagram, Structured Text, Sequential Function Chart
Modularity	Yes
Certifications	UL, CE
Processor Type	Multiple options available, including standard, safety, and extreme environment processors
Power Supply	Multiple options available, including standard and redundant power supplies with various voltage ranges (e.g., 24V DC, 120/240V AC)