UCD240A01热电偶模块
模块完整性所有INFI-NET通信模块都具有确保模块完整性的正常INFI 90安全功能。模块硬件检查非法地址并监控机器故障计时器（MFT）和I/O扩展器总线时钟。如果模块检测到非法地址，它将生成总线错误并在面板LED上显示错误代码。如果微处理器未能重置MFT计时器，则它将过期。发生这种情况时，通信模块停止，状态LED变为红色。模块硬件还监控I/O扩展器总线时钟。如果没有时钟信号，模块硬件会产生中断。INNIS01网络接口从模块NIS模块用作INICT01和INICT03模块的I/O模块。虽然每个计算机接口使用不同的INFI-NET通信模块，但NIS模块与每个通信模块的操作方式相同。本节概述了INFI-NET通信模块的工作原理NIS模块处理四种不同的消息类型。它们是广播、时间同步、多播和NIS轮询。广播NIS模块在向所有系统节点发送信息时生成广播消息。通常，这些消息会宣布节点状态的更改。广播消息包括节点在线、节点离线、节点重启和节点忙碌。
异常报告
每个INFI 90模块为过程输入（点）建立异常报告参数。异常报告参数的一些示例包括高报警限值和低报警限值、最小和最大报告时间间隔以及量程限值的变化百分比。当一个点的变化超过给定参数，或报警状态发生变化时，模块会生成异常报告。计算机传输模块（通过Controlway或模块总线）轮询模块以获取异常报告，并将异常报告打包为具有公共节点目的地。打包将一个目的地（或多个目的地）的所有异常报告放入一条消息（长度可变）中。NIS模块将此消息发送到其他INFI-NET节点。此过程减少了所需的传输次数，并调整了消息大小以获得最大的INFI-NET循环效率。异常报告可以具有以下格式的数据值：布尔、模拟、数字和状态报告。异常报告带有时间戳，以反映其处理顺序。最大和最小报告时间参数确保为静态或快速变化的数据生成异常报告。最小报告时间参数控制单个快速变化点生成的异常报告的数量。最长报告时间参数会生成定期异常报告，报告的数据项不会更改或更改非常缓慢。注：如果某个点进入或退出报警，则忽略时间参数并立即生成异常报告
MODULE INTEGRITY
All INFI-NET communication modules have normal INFI 90 security functions that insure module integrity. The module hardware checks for illegal addresses and monitors the machine fault timer (MFT) and the I/O expander bus clock. If a module detects an illegal address, it generates a bus error and displays an error code on the faceplate LEDs. If the microprocessor fails to reset the MFT timer, it expires. When this happens, the communication module stops and the status LED turns red. Module hardware also monitors the I/O expander bus clock. If there is no clock signal, the module hardware generates an interrupt. INNIS01 NETWORK INTERFACE SLAVE MODULE The NIS module serves as an I/O module to both the INICT01 and INICT03 modules. While each computer interface uses different INFI-NET communication modules, the NIS module operates with each communication module in the same manner. This section provides an overview of INFI-NET communication module operating theory The NIS module processes four different message types. They are broadcast, time synchronization, multicast, and NIS poll. BROADCAST The NIS module generates a broadcast message when sending information to all system nodes. Typically, these messages announce changes in node status. Broadcast messages include NODE ONLINE, NODE OFFLINE, NODE RESTART and NODE BUSY.
Exception Reports
Each INFI 90 module establishes exception reporting parameters for process inputs (points). Some examples of exception report parameters are high and low alarm limits, minimum and maximum report time intervals, and percent of change in span limits. When a point changes more than a given parameter, or an alarm state changes, the module generates an exception report. The computer transfer module polls modules (via the Controlway or module bus) for exception reports, and packs the exception reports having a common node destination. Packing places all exception reports for a destination (or multiple destinations) into one message (of variable length). The NIS module sends this message to other INFI-NET nodes. This process reduces the number of transmissions required, and adjusts the message size for maximum INFI-NET loop efficiency. Exception reports can have data values in the following formats: Boolean, analog, digital and status report. Exception reports are time stamped to reflect their processing sequence. The maximum and minimum report time parameters insure that an exception report is generated for static or rapidly changing data. The minimum report time parameter controls the quantity of exception reports a single rapidly changing point generates. The maximum report time parameter generates a periodic exception report of data items that do not change or change very slowly. NOTE: If a point goes into or out of alarm, the time parameters are ignored and an exception report is generated immediately
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