User manual

98 Rockwell Automation Publication 1756-UM001O-EN-P - October 2014
Chapter 5 Communication Networks
1. Configure the remote I/O adapter.
2. Lay out the remote I/O network cable.
3. Connect the remote I/O network cable.
4. Configure the scanner channel.
For more information to configure a remote I/O network with the 1756-RIO,
1756-DHRIO, or 1756-DHRIOXT modules, see these publications:
• Data Highway Plus-Remote I/O Communication Interface Module User
Manual, publication 1756-UM514
• ControlLogix Remote I/O Communication Module User Manual,
publication 1756-UM534
As you design your remote I/O network, remember the following:
• All devices that are connected to a remote I/O network must
communicate by using the same communication rate. These rates are
available for remote I/O:
– 57.6 Kbps
– 115.2 Kbps
– 230.4 Kbps
• You must assign unique partial and full racks to each channel used in
Remote I/O Scanner mode.
Both channels of a 1756-DHRIO or 1756-DHRIOXT module cannot
scan the same partial or full rack address. Both module channels can
communicate to 00…37 octal or 40…77 octal, but each channel can
communicate only with one address at a time in whichever of these two
ranges it falls.
Foundation Fieldbus
Communication
Foundation Fieldbus is an open interoperable fieldbus that is designed for process
control instrumentation. The fieldbus devices that are described in Table 22
can
be connected to the ControlLogix controller via another network as shown in
the following example.
Table 22 - Fieldbus Devices and Capabilities
Fieldbus Device Is used to
1788-EN2FFR • Bridge an EtherNet/IP network to Foundation Fieldbus.
• Connect via a low-speed serial (H1) and high-speed Ethernet (HSE) network
connections.
• Access devices directly via an OPC server.
1788-CN2FFR • Connect via low-speed serial (H1) connections.
• Bridge a ControlNet network to a Foundation Fieldbus.
• Support redundant ControlNet media.