图1-4 Tricon 主机架背板 
图中：①双重电源轨 ②电源端子条 ③#1电源 ④#2电源 ⑤I/O终端用ELCO接头 ⑥公共总线 ⑦I/O总线  ⑧主处理器A、B、C  ⑨左I/O 模块左I/O 模块 标准逻辑槽口 ⑩通讯模块  ○11左模块和右模块在任一特定时间内都互为备用 
每个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。234271-10388-A06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。  
I/O总线可使信息在I/O模块和主处理器之间传送，速率为375K波特。三重化I/O总线沿着背板的底部敷设。I/O总线的每一分234271-10388-A06电路在一个主处理器与其相应的I/O模块上的相应的分电路间传递信息。I/O总线通过一组三条I/O总线缆在各机架间的延伸。 
通讯总线在主处理器和通讯模块之间传输信息，其速率为2 M波特。对机架的电力被分配在两个独立的电源轨上，并分给背板的中心。机架上的各个模块从两条电源轨上通过双重电源调节器同时吸取电力。每一块输入输出板上有四组电源调节器：一组对应一个支路（A、B和C），剩下一组用于状态指示灯。  
1.3.3 234271-10388-A06数字输入模块  
Tricon提供两种基本类型的数字输入模块：TMR和简易型。在TMR模块上，全部关键的信道都被100%地三重化，以保证安全性和最大的利用率。在简易型模块上，只有那些保证安全运行所需的信号通路部分才被三重化。简易型模块用于低成本比最大利用率更重要的关键安全场合。 
1.3.3.1 TMR数字输入模块  
每个数字输入模块内有三个相同的分电路（A、B、C）。虽然三个分电路都装在同一模块内，但它们是完全相互隔离的，并独立运行。每个分电路可独立地对信号进行处理并在现场和Tricon之
间采用光电隔离。（#3504E型64点高密度数字输入模块是一个例外，它没有隔离。）一条分电路上的故障就不会扩散到另外的分电路。此外，每条支路含有一个8位微处理器（IOP），它处理与其相应的主处理器的通讯。 
三个输入分电路的每一个分电路可异步地检查输入端子板上的每点信号，以判别其状态并将值放在相应的A、B、C输入表内。234271-10388-A06每个输入表都定期地经过I/O总线由位于相应的主处理器模块上的I/O通讯处理器进行询问。例如，主处理A通过I/O总线A询问输入表A。 
234271-10388-A06带自测试的直流数字输入模块，能够检测“ON粘住”（指模块测量回路无法检测到现场信号断开）的状态，这对安全系统是一个重要的特征。因为绝大数安全系统都是“去磁跳闸”。为了测试“STUCK ON”现象，通过输入一个闭合信号（输入电路中的一个开关），使光电隔离电路能读取零值输入值，以此来检测“ON 粘住”状态。在测试期间，上一次读取的数据（数据OFF），冻结在IOP内（I/O通讯处理器内）。 

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