Allen-Bradley ControlLogix User Manual

1756-6.5.3 - December 1999
ControlNet Communication Basics 1-5
See the chapters on scheduled communications for examples of creating
produced/consumed tags and send/receive scheduled messages.
Processing Produced and Consumed Tags
In the producer/consumer model, the consumer is the connection originator
(it opens the connection). When several consumers are trying to open the
connection to the same tag, the connection will be opened to transfer data at
the rate of the consumer with the smallest API (see Actual Packet Interval
on page 1-8).
The producer and consumer must be configured correctly for the specified
data to be shared. To produce for several consumers, the producer must be
configured for this using the RSLogix5000 software for the Logix5550
controller. For the PLC-5C send and receive scheduled messages are
configured using the Map Editing Tool in RSNetWorx for ControlNet.
For ControlLogix controllers, a consumed tag in the consumer must be
specified exactly the same as a produced tag in the producer. In the
following example, consumer_2 does not have the correct tags.
When consumer_2 tries to obtain the shared tags, the connections fail. Even
though three of the tags are specified correctly (B, C, and D), the
connections fail for all the consumed tags because one was incorrect (E).
The other consumers (consumer_1 and consumer_3) can still obtain the
shared tags from the network, as long as their tags are specified correctly.
One consumer failing to obtain shared data does not affect other consumers
accessing the same data.
A
B
C
D
Produced tag names
producer consumer_1
consumer_2
consumer_3
E
B
C
D
Consumed tag names
B
C
D
Consumed tag names
A
B
D
Consumed tag names

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)