Rockwell Automation 5370 CVIM Communications Manual - Manual (Page 19)

Chapter 2
Introduction
2–7
There are four communications ports which you can use simultaneously to
access CVIM module data (Remote I/O, RS–232 Ports A & B, and
Backplane). Only the host can issue commands to control the operation of
the CVIM module. You can read discrete bits and numerical results
information through any of the four communications ports, even through
non–host devices.
The CVIM module can operate with multiple hosts. You can select one host
to perform CVIM module/host configuration transfers, and another host to
perform all other CVIM/host operations. These two hosts are referred to as
the configuration host (CFG) and the system host (SYS). An example of
using multiple hosts is to select RS–232 A as the CFG host, and Remote I/O
as the SYS host.
Note: Any CVIM communications port can be used for reading results block
data regardless of whether or not the device connected to the port is selected
as a host.
Note: You can select the same host (Stand Alone, Pyramid, Remote I/O,
RS–232 A or B) as both the configuration host and the system host.
Host Designation
Multiple Hosts