Motorola V186 User Manual - Page 68
Expansion Module Power-up and Restart, Expansion Module during Run-Time
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I/O Expansion Expansion Module Power-up and Restart The MCOM LED on the expansion module indicates the connection status between the expansion module and the main CPU and expansion frame initialization progress. The main CPU expects the expansion frames to complete the initialization within a configurable period of time (60 seconds default). After this period of time elapses, the main CPU will operate normally with the connected frames and their I/O modules. Any expansion frame that has not completed initialization within that time (e.g. because it was connected later to the RTU) will be ignored until the next main CPU restart. Note that after the main CPU starts up, it waits for the expansion modules to complete the initialization process. The wait time is derived from the number of expansion frames configured in the RTU. After all the expansion frames have completed the initialization, the main CPU will continue its system startup. The main CPU will wait 60 seconds (default) for all expansion frames to connect. Expansion Module during Run-Time The expansion module constantly exchanges I/O data and status data with the main CPU, using the Ethernet Micro-code Interface (EMI). The EMI enables the main CPU to be updated by all the expansion modules every very short period of time 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. 64