Controller Architecture 7
Chapter 1 Theory of Operation
Bus and Power Distribution
The triplicated I⁄O bus, as shown on page 8, is carried baseplate-to-baseplate using
Interconnect Assemblies, I⁄O Extender Modules, and I⁄O bus cables. The redundant
logic power distribution system is carried using Interconnect Assemblies and I⁄O
Extender modules.
The TriBus, which is local to the MP Baseplate, consists of three independent,
serial links operating at 25 megabits per second. The TriBus synchronizes the MPs
at the beginning of a scan. Then each MP sends its data to its upstream and
downstream neighbors. The TriBus takes the following actions:
• Transfers input, diagnostic, and communication data
• Compares data and flags disagreements with the output of the previous scan
and program memory
An important feature of the Trident controller architecture is the use of a single
transmitter to send data to both the upstream and downstream MPs. This ensures
that the same data is received by the upstream processor and the downstream
processor.
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