Publication 1756-UM514B-EN-P - February 2003
1-2 1756-DHRIO Module Description
Routing Limitations
The 1756-DHRIO module can route a message through up to four
communications networks and three chassis. This limit applies only to
the routing of a message and not to the total number of networks or
chassis in a system.
DH+ and CIP Messaging
The 1756-DHRIO module allows an information exchange between
devices, such as ControlLogix controllers, PLCs and SLCs.
With the 1756-DHRIO module, you may exchange information in any
of the following scenarios:
· between PLCs/SLCs on different networks
· between the ControlLogix controllers and a PLC/SLC on different
networks
· between ControlLogix controllers on different networks
Figure 1.1 shows an example system. Two ControlLogix chassis link
existing Data Highway Plus networks. Communication between PLC-5
programmable controllers on different networks is accomplished in
the same manner used for communication within a network.
Figure 1.1
41275
Data Collection and
Recipe Management
Programming
Terminal
ControlLogix
Chassis
ControlLogix
Chassis
Data Highway Plus
PLC-5
Data Highway Plus
SLC 500 RSView PLC-5 SLC 500 RSView
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