Rockwell Automation 5370 Color CVIM Communications Manual - Manual (Page 20)

Chapter 2
Introduction
2–7
There are four communications ports which you can use simultaneously to
access Color 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 Color CVIM module. You can read discrete bits and numerical results
information through any of the four communications ports, even through
non–host devices.
The Color CVIM can operate with multiple hosts. You can select one host to
perform Color CVIM module/host configuration transfers, and another host
to perform all other Color CVIM/host operations. The first of these two hosts
is referred to as the configuration host (CFG) because it is the sole source of
configuration information. The second, referred to as the system host (SYS),
can tell the system when to trigger and control the user interface. A system
host cannot supply a new configuration.
An example of using multiple hosts is to select RS–232 A as the CFG host,
and Remote I/O as the SYS host. If you select a single device as both CFG
and SYS hosts, then that device must be labeled as such.
Note: Any Color 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