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Power-down
When the voltage provided to the CPU module drops below the minimum level, the CPU will
shut down in an orderly fashion. This level is configurable for all power supply modules other
than the 12V DC power supply low-tier. See the 'Minimum DC operation voltage' parameter
in Appendix A: Site Configuration Parameters of the ACE3600 STS User Guide.
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 message, orange indicates a warning and red indicates an 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. For more
information, see the Hardware Test 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.
Note: A TORX screwdriver is required for installation of the plug-in ports.
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CPU Module
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