Allen-Bradley ControlLogix User Manual

1756-6.5.3 - December 1999
Allocating Communication Connections A-7
Optimizing produced tags
Each produced tag requires connections that can be used for other controller
operations. To minimize the of produced tags, and the number of required
connections, consider grouping data into an array or a user-defined structure
and producing only that array or structure, as long as the array or structure is
not larger than 500 bytes.
Compare the following two examples to see how a user-defined data type
(structure) reduces the number of connections required to produce the same
data.
Example 1: Producing data as individual tags
Example 2: Producing data as a user-defined data type (structure)
Connections for consumed tags
Each consumed tag requires one connection for the controller that is
consuming the tag.
Produced Tag Data Type
Connection
for the Tag
Number of
Consumers
Total Connections
height
width
weight
W_flag
L_flag
DINT
DINT
REAL
DINT
DINT
1
1
1
1
1
3
3
3
3
3
4
4
4
4
4
Total: 20 connections
Produced Tag Data Type
Connection
for the Tag
Number of
Consumers
Total Connections
Load_Info User-defined structure of:
height (DINT)
width (DINT)
weight (REAL)
W_flag (DINT)
L_flag (DINT)
1 3 4
Total: 4 connections

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)