总线系统及电源分配  
如图1-4所示，三条三重总线系统都蚀刻在机架背板上，三条总线为TriBus、I/O总线、及通讯总线。 
TriBus包括三条独立的串联的链路，在4Mband下运行。它在每一扫描开始时使各主处理器同步。然后，每个主处理器将它的数据送入它的上游和下游的主处理器。TriBus完成下列三种功能： 
——传输模拟的、诊断的、和通讯的数据——传输和表决数字输入数据——对上次扫描的输出数据和控制程序存贮器进行数据比较并对不同之处进行标识。 
Tricon容错结构的一个重要特征是，每一个MP使用了同一个数据发送器将数据同时送给上游的和下游的主处理器，这样保证了同样上游处理器和下游处理器接收相同的数据。
个I/O 模块通过其对应的端子板接收现场信号或向现场传送数据。机架相邻的物理槽位视作同一个逻辑槽位。第一个位置上放置工作模块，第二位置放置热备I/O模块。端子板通过背板顶部的Elco插头相连，同时连接工作和热备的I/O模块。所以，这两个模块接收的是相同的来自端子板的信号。

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