Product Description
A Tricon system contains three main
processor (MP) modules to control
three separate channels of the system.
Each main processor operates in
parallel with the other two main processors, as a member of a triad.
A dedicated I/O and COMM processor
on each main processor manages the
data exchanged between the main
processors and the I/O modules. A triplicated I/O bus is located on the chassis
backplane and is extended from chassis
to chassis by means of I/O bus cables.
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.
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