Owner's manual

4
Chapter
4–1
Using the Remote I/O Link
In this chapter we provide:
• Basic description of Remote I/O communications.
• Connection diagrams.
• Description of CVIM module setup requirements.
• Three example PLC programs for accessing CVIM module data.
• An example 6008–SI program.
As stated earlier, the Remote I/O port is located on the front of the CVIM
module and is labeled RIO. This port allows the CVIM module to become a
link in an Allen–Bradley Remote I/O network which can be up to 10,000 feet
long. Data on the network can be transmitted at baud rates as high as 230K.
Maximum Link Length (Feet) Baud Rate
10,000 57.6K
5,000 115.2K
2,500 230.4K*
* Only applies to communications between PLC-5/250 controllers in other racks.
Use twin–axial cable (Catalog No. 1770–CD) to connect the CVIM module
to other devices. This cable connects to the Remote I/O port (labeled RIO)
and the next device on the network. Refer to Figures 4.1 through 4.8 for
connection diagrams.
Chapter Objectives
Remote I/O Communications