Publication 1756-UM514B-EN-P - February 2003
Using the Data Highway Plus Network 2-17
Using Control and
Information Protocol (CIP)
Messaging
Control and Information Protocol (CIP) is the communications
mechanism on ControlLogix chassis, ControlNet network and Ethernet
with the Encapsulation Protocol (EPIC) protocol.
Like DH+ messaging, CIP supports communication between devices
on the same link and physically separate links. However, CIP
Messaging uses a different method to route messages than
DH+ Messaging.
CIP uses a “relative path” concept for routing messaging. Because the
message itself, or the connection the message is sent on, contains all
the information required to route the message, CIP messages do not
require any routing table or link IDs. For more information on paths,
see
Chapter 3, Using Programming Software in DH+ Applications.
Devices such as ControlLogix devices, devices that use the ControlNet
network, and devices that use EPIC protocol on Ethernet support this
new type of communication.
Figure 2.6
IMPORTANT
Your 1756-DHRIO module supports bridging CIP
messaging over a DH+ link. However, your
1756-DHRIO module does not support bridging CIP
I/O data from a ControlLogix controller to an
1756-I/O module.
The message originator, target, and all modules and
links between them must support CIP to send a
message using CIP protocol.
ControlLogix system #1
Node:0 01
ControlLogix system #2
1756-DHRIOControlLogix controller
41289
1756-DHRIO
Controller controller
Node: 002
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