Rockwell Automation 1785-CHBM ControlNet PLC-5 Hot Backup System User Manual - Manual (Page 63)

Publication 1785-UM024B-EN-P - January 2003
Using I/O in Your ControlNet Hot Backup System 4-9
This procedure assumes that the HMI knows which PLC-5 is the
primary programmable controller. Refer to the above procedures to
determine the primary PLC-5.
Checking ControlNet Resources
When an HMI device is connected to the PLC-5, it uses the some of
the limited resources of the PLC-5. The PLC-5 keeps diagnostic
information on its resources in its ControlNet diagnostics file. You can
check this information periodically to make sure the HMI device will
not allocate a resource from the PLC-5 that is no longer available.