Owner`s manual

CPU Module
4-5
Power-up and Restart
The CPU requires DC voltage provided by the power supply module via the motherboard
(when the PS switch is ON). The CPU will power-up and restart in the range of 10.5 to 16 V
DC. During power-up, the processor performs fast memory tests, initiates the RTU and starts
the user program (if it was downloaded). The end of power-up sequence is indicated by the
buzzer. The length of time from the beginning of CPU power-up until the user program starts
running is approximately 5-6 seconds.
It is possible to perform a comprehensive memory test during power-up by pressing push-
button PB1 for few seconds while switching the power supply from OFF to ON. In this case
the power-up period is about 30-35 seconds long.
Power-down
When the voltage provided to the CPU module drops below 9.6VDC, the CPU will shut down
in an orderly fashion.
CPU Status and Diagnostics
The CPU status is indicated on the front panel LED. Detailed CPU status and diagnostics
information can be retrieved from the module using the CPU Hardware Test utility. For more
details, see the Hardware Test section of the ACE3600 STS User Guide.
CPU Warnings and Errors
CPU warnings and errors are logged in the CPU memory to indicate issues or errors during
power-up, restart, user application program execution and other modes of CPU operation. The
existence of CPU warnings and errors are indicated in the ERR LED on the front panel of the
module. Green indicates a warning, orange indicates an error and red indicates a critical error.
The CPU error logger information can be retrieved using the STS Error Logger utility. For
more details, see the Error Logger section of the ACE3600 STS User Guide.
CPU Serial Number
Each CPU has a unique serial number. This number is printed on a label on the side of the CPU
module front panel. The serial number can be read using the STS Hardware Test and is also
available to the user application program. For more information, see the Hardware Test section
or the Creating a User Application section of the ACE3600 STS User Guide.
Connecting Plug-In Ports to the CPU Module
In general, the plug-in ports are ordered as options with the RTU and are installed in the
factory. However, it is also possible to add plug-in ports to the CPU after it is shipped from the
factory. Several plug-in ports are available. See Communication Ports above.