Rockwell Automation 57C650 AutoMax Programming Executive Version 3.8 - Manual (Page 153)

10Ć5 AutoMax Processor Overview
After the diagnostics are complete, a checksum of a portion of the
contents of memory is verified against a checksum which was stored
in memory when a loss of AC power was detected. This determines
whether the system performs a reĆstart or a coldĆstart when power is
turned on. See 10.13 and 10.14 for more information on cold starts
and system reĆstarts.
10.9 RunĆTime Diagnostics
The Processor module performs realĆtime checking of all data paths
on the module by means of a parity test. The Processor contains a
memory management unit (MMU) that prevents errors such as writing
to locations that are readĆonly.
Should a failure be detected, a fault code will be displayed and the
Processor shut down. See instruction manual JĆ3650 for more
information on runĆtime diagnostics.
10.10 Status Codes
Status Codes are those codes displayed on the sevenĆsegment LEDs
on the Processor module faceplate while the OK" indicator is on.
Status codes simply indicate that a particular operation is occurring
or that a particular condition exists. They do not cause the Processor
to shut down. Status codes may or may not be cleared when the
condition they indicated no longer exists. See Appendix B for a list of
status codes.
10.11 ShutĆDown Faults
Serious hardware malfunctions that cause the Processor to shut
down and the OK" indicator to be turned off are called shutĆdown
faults. When possible, the cause of the shutĆdown is indicated by an
error code on the seven segment LEDs. See Appendix B for a list of
status and error codes.
Once a Processor module has shut down, it will not execute any
instructions or respond to commands from the personal computer
until it is reset by cycling power.
10.12 StopĆAll Faults
In AutoMax systems, both a StopĆAll command and a StopĆAll fault
have the same result. A StopĆAll command can be issued from the
online menu of the Programming Executive software. A StopĆAll fault
occurs when there is a serious error either in an application task in
the rack (e.g., invalid BASIC language EVENT statement), or when
there is a serious error in an AutoMax Processor or Universal Drive
Controller module. See Appendix B for a list of status and error
codes.
Both a StopĆAll fault and a StopĆAll command will result in all
application tasks in the rack being stopped. The common clock
signal on the rack backplane (CCLK) will also be disabled. A StopĆAll
fault will result in an error code display on the faceplate of the
AutoMax Processor that was running the task that caused the
StopĆAll. Neither the operating systems or the application tasks on