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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 10.8V to 16V
DC. During power-up, the processor performs fast memory tests, initiates the RTU and starts
the user program (if one was downloaded). The end of the 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 10-15 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.
If the startup fails, the RTU will freeze (boot sequence stops), the PWR LED will blink and
the four indicator LEDs (see LEDs Location in Table 4-3) will blink seven times. The four
LEDs will then display the failure error in binary code, as described in Table 4-3.
Restart after Firmware Download
The RTU will restart after downloading system firmware. If the firmware is faulty or the
firmware download failed, the RTU, if protected by the Safe Firmware Download feature, will
restart and roll back to the previous firmware version. A failure message will appear in the
STS Downloader screen. For information on using the Safe Firmware Download feature, see
the Safe Firmware Download section of the ACE3600 STS Advanced Features manual.
Restart after Configuration Download
The RTU will restart after downloading a site configuration. For information on downloading
to the RTU, see the Operation chapter of the ACE3600 STS User Guide.
If the RTU fails to restart after the user-defined site configuration was downloaded, a unique
LED display (in the range of the PI1-TX and SI2-RX LEDs) and a series of buzzer tones will
follow. The RST LED will turn RED and the RTU will restart itself with the previous "good"
configuration. The following message will appear in the RTU Error Logger "Configuration
file was deleted due to failure in startup. Rolling back to the last configuration file". Errors
can be retrieved from the RTU using the ACE3600 STS Error Logger utility.
If the startup succeeds after configuration download but has errors, these errors are reported in
the RTU Error Logger. It is, therefore, recommended to check for errors after downloading a
configuration file to the RTU. Errors can be retrieved from the RTU using the ACE3600 STS
Error Logger utility.
For information on retrieving errors from the RTU Error Logger, see the Operation chapter of
the ACE3600 STS User Guide.
Restart after Erase Flash
After the User Flash is erased, the RTU will restart successfully with the default site
configuration.
4-6
CPU Module
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