Rockwell Automation 1785-CHBM ControlNet PLC-5 Hot Backup System User Manual - Manual (Page 75)

Publication 1785-UM024B-EN-P - January 2003
Monitoring and Troubleshooting Your ControlNet PLC-5 Hot Backup System 5-11
30 Accept Configuration Changes. A non-zero value written into this
location forces the primary PLC-5 processor to accept the new
configuration parameters. After the PLC-5 processor has done so, it will
zero this word. This command is only in effect for the primary processor.
The configuration parameters you change are:
Operational mode
Maximum Program scan time
Equivalence checks
Designated primary
Crossload parameters
Requalification
31 Force Switchover. A non-zero value written into this location forces the
primary processor to switch over control to a secondary processor. After
the processor has read the non-zero value, the PLC-5 processor will zero
this word. This command works for both the primary and secondary
processors. However, if there is a Designated Primary, this command will
not function.
32 Clear Diagnostic Counters. A non-zero value written into this location
clears the maximum program scan exceed counter, the lost partner
counter, and the lonely primary backup state counter. After the processor
has read the non-zero value, it will clear this word. This feature works for
both the primary and secondary processors, but will only work in Run
mode.
33 Perform On-Demand Crossload. You can specify whether to crossload
timers, counters, PID files, or user-defined files (configured in words 55,
56, 57, and 58 of the ControlNet Backup Configuration and Status file) by
setting appropriate bits in this word. After the PLC-5 has read the word,
it clears it. This feature works for both primary and secondary
processors.
Bit 0 - Crossload Timers
Bit 1 - Crossload Counters
Bit 2 - Crossload PID
Bit 3 - Crossload user-defined files
34-38 reserved
39 Completion of Qualification. You can control when qualification
completes by setting and clearing this word in the CBI file. When the
qualifying processor (either primary or secondary) executes its first scan
of the program, you can activate the delay of the completion of
qualification by writing a non-zero value into word 39 of the CBI file. The
delay continues until you clear this word.
40-45 The timedate stamp indicating when the processor last took over as the
primary is stored here. The format of the data is the same as the clock in
the status file.
Word Definition