Publication 1756-UM514B-EN-P - February 2003
2-6 Using the Data Highway Plus Network
Two Methods of
Communication Over DH+
The 1756-DHRIO module acts as a bridge for two methods of
communication. These methods are:
· DH+ Messaging
· Control and Information Protocol (CIP) Messaging
Table 2.4 lists the devices that support each communication method.
Using DH+ Messaging
DH+ Messaging offers the following benefits:
· You can send messages between devices on the same link.
· You can send messages between devices on different links.
· It is compatible with many existing Allen-Bradley modules.
DH+ messaging is divided into two types:
· Local DH+ Messaging - See page 2-7
· Remote DH+ Messaging - See page 2-10
Before you can design a control system to meet your application
needs, be aware of the difference between Local DH+ Messaging and
Remote DH+ Messaging.
Table 2.4
Types of Communication on the 1756-DHRIO module
Type of communication: Devices and Software supporting this type:
DH+ messaging PLC-3
PLC-5
PLC-5/250
SLC-500
ControlLogix controllers
RSLinx
Interchange
Control and Information Protocol
(CIP) messaging
ControlLogix controller
RSLogix 5000
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