Introduction
This topic describes the operating states for M580 standalone and Hot Standby CPUs.
Operating States for Standalone CPUs
All standalone M580 CPUs have these operating states:
Operating State |
Description |
|---|---|
AUTOTEST |
The CPU is executing its internal self-tests. NOTE: If extended
racks are connected to the main local rack and line terminators are
not plugged into the unused connectors on the rack extender module,
the CPU remains in AUTOTEST after the
self-tests have completed.
|
NOCONF |
The application program is not valid. |
STOP |
The CPU has a valid application, but it is stopped. The CPU sets itself to predefined STOP state parameters, and can be restarted when you are ready. |
HALT |
The CPU has an application, but it has stopped operating because it encountered an unexpected blocking condition, which puts the CPU in a HALT state, resulting in a recoverable or nonrecoverable condition. |
RUN |
The CPU is executing the application program. |
WAIT |
The CPU is in a transitory state while it backs up data when a power down condition is detected. The CPU starts again only when power is restored and the supply reserve is replenished. As it is a transitory state, it may not be viewed. The CPU performs a warm restart to exit the WAIT state. |
ERROR |
The CPU is stopped because a hardware or system error is detected. When the system is ready to be restarted, the CPU performs a cold start to exit the ERROR state. |
OS DOWNLOAD |
A CPU firmware download is in progress. |
Monitoring the CPU Operating State
The LEDs on the CPU front panel provide indications of its operating state.