Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 41)

Chapter
Communicating with Remote I/O
4
4Ć4
Two channels on the same scanner cannot scan the same partial or full
rack address. Assign unique partial and full racks to each channel.
You can split rack addresses between scanner channels; however, issues
arise when performing block-data transfer. If you split remote rack
addresses between scanner channels, channel A has priority over
channel B.
A scan list can have a maximum of 16 rack numbers or a maximum of
64 physical devices connected to it using 82-
Ω
termination resistors.
Cable Design Guidelines
Specify 1770-CD (Belden 9463) cable. Connect a remote I/O network
using a daisy chain or trunk line/drop line configuration.
Important: The maximum cable length for remote I/O depends on the
transmission rate. Configure all devices on a remote I/O link to
communicate at the same transmission rate.
For trunk line/drop line configurations, use the 1770-SC station connectors
and follow these guidelines:
the length of the trunk line cable depends on the communication rate
the length of the drop cable is 30.4 m (100 cable-ft)
For more information about designing trunk line/drop line configurations,
see the Data Highway/Data Highway Plus/Data Highway II/Data
Highway-485 Cable Installation Manual, publication 1770-6.2.2.
For daisy chain configurations, determine the total cable length you need.
A remote I/O link using this
communication rate:
cannot exceed this
cable length:
57.6 kbps 3,048 m (10,000 ft)
115.2 kbps 1,524 m (5,000 ft)
230.4 kbps 762 m (2,500 ft)
Design Tip