Module Status And Diagnostics - Motorola ACE3600 RTU Owner's Manual

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 in the main CPU, the RTU will restart with the default site
configuration and all expansion modules will restart. Note that the restart includes the time to
identify all expansion frames, as described above.
Expansion Module during Run-Time
The expansion module constantly exchanges I/O data and status data with the main CPU, using
the Ethernet Microcode Interface (EMI). The EMI enables the main CPU to be updated by all
the expansion modules at very short intervals via the expansion Ethernet LAN. The main CPU
constantly synchronizes the expansion module date and time, and periodically polls the errors,
pushbuttons and time tagged data from all the connected expansion modules.
If the connection between the expansion module and the main CPU is lost (e.g. due to main
CPU restart, cable disconnection, etc.) for a configurable period of time (1 minute default), the
expansion module will restart and the initialization process will begin again.
After the expansion frames have initialized, it is possible to download to the RTU a user
program or other user defined files. After successful download, the main CPU automatically
updates each expansion module. Note that if the main CPU tries to download a user program
or other files to an expansion module during initialization, the expansion module is restarted.
Power-down
When the voltage provided to the expansion module (from the power supply on the expansion
frame) drops below the minimum level, the module will shut down in an orderly fashion.
When the expansion frame is powered using an expansion power supply (or 12V low-tier
power supply), it may shut down when the voltage drops below 10.8 V. When the expansion
frame is powered using other types of ACE3600 power supplies, this level is configurable.
See the 'Minimum DC operation voltage' parameter in Appendix A: Site Configuration
Parameters of the ACE3600 STS User Guide.
File Download without Restart
When certain files (e.g. I/O FPGA, encryption keys, compiled ladder) are downloaded from
the STS to the main CPU, the main CPU will "forward" the files to the expansion modules,
without forcing a restart. The main CPU will restart the expansion modules if the "forward"
operation fails for some reason (e.g. temporary loss of communication.)

Module Status and Diagnostics

The module status is indicated on the front panel LED. Detailed module status and diagnostics
information can be retrieved via the main CPU using the STS Hardware Test utility. For more
details, see the Hardware Test section of the ACE3600 STS User Guide.
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Expansion Module