Product Discription
As each input module is polled, the new
input data is transmitted to the main
processor over the appropriate channel
of the I/O bus. The input data from each
input module is assembled into a table
in the main processor and stored in
memory for use in the hardware voting
process.
The individual input table in each main
processor is transferred to its neighboring main processors over the proprietary TriBus. During this transfer,
hardware voting takes place. The
TriBus uses a direct memory access
(DMA) programmable device to
synchronize, transmit, vote and
compare data among the three main
processors.
If a disagreement is discovered, the
signal value found in two out of three
tables prevails, and the third table is
corrected accordingly. One-time differences which result from sample timing
variations can be distinguished from a
pattern of differing data. The three
independent main processors each
maintain data about necessary corrections in local memory. Any disparity is
flagged and used at the end of the scan
by the built-in Fault Analyzer routines
to determine whether a fault exists on a
particular module.
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