CVC750BE101 IGCT模块
MFP/MFC模块操作控制模块（MFP/MFC）指导发射器的操作并保持其操作策略。功能代码132（模拟输入/从机）读取FEC模块的模拟输入。控制模块中的功能代码133（智能发射器定义，仅适用于IMFEC11）的配置决定了每个智能发射器的操作策略。当控制模块在其配置中处于功能代码132和可选的功能代码133的执行模式时，操作开始。当控制模块进入执行模式时，它将操作策略下载到FEC模块。功能操作FEC模块可分为IMFEC12的四个功能块和IMFEC11的五个功能块。图2-1显示了IMFEC1模拟输入（FEC）模块的框图。功能块包括：•模块输入/输出（仅适用于IMFEC11的AC耦合器和FSK多路复用器）。•通信电路（仅限IMFEC11）。•微处理器和控制逻辑。•模数转换器。•I/O扩展器总线接口。以下各节解释构成IMFEC1电路的功能块的操作。
微处理器和控制逻辑电路
车载微处理器和控制逻辑协调模块功能。微处理器有四个主要功能：•将数字数据存储在随机存取存储器（RAM）中。•通过模数控制芯片协调模数转换。•准备发送至智能变送器的数字命令（仅限IMFEC11）。•读取并向控制模块（MFP/MFC）发送数据。微处理器直接连接到8千字节的随机存取存储器。该存储器用作过程数据和变送器配置信息的存储区域。微处理器通过ADC电路协调模数转换。微处理器从ADC电路接收转换后的过程数据，并将其放入存储器缓冲器中。它保留在存储器中，直到控制模块请求处理数据或微处理器用新值更新它。当微处理器接收到对过程数据的请求时，它将数据从存储器缓冲器传输到先进先出（FIFO）移位寄存器，控制模块可以通过I/O扩展器总线接口访问该寄存器。
MFP/MFC MODULE OPERATION
The controlling module (MFP/MFC) directs the operation of the transmitters and holds their operating strategy. Function code 132 (analog input/slave) reads the analog inputs of the FEC module. The configuration of function code 133 (smart transmitter definition, for IMFEC11 only) in the controlling module determines the operating strategy of each smart transmitter. Operation begins when the controlling module is placed in the execute mode with function code 132, and optionally with function code 133, in its configuration. When the controlling module enters the execute mode, it downloads the operating strategy to the FEC module. FUNCTIONAL OPERATION The FEC module can be divided into four functional blocks for the IMFEC12 and five functional blocks for the IMFEC11. Figure 2-1 shows a block diagram of the IMFEC1 Analog Input (FEC) module. The functional blocks are: • Module inputs/outputs (AC coupler and FSK multiplexer for the IMFEC11 only). • Communication circuitry (IMFEC11 only). • Microprocessor and control logic. • Analog-to-digital converter. • I/O expander bus interface. The following sections explain the operation of the functional blocks that make up the IMFEC1 circuitry.
Microprocessor and Control Logic Circuitry
The on-board microprocessor and control logic coordinates module functions. The microprocessor has four main functions: • Storing the digital data in random access memory (RAM). • Coordinating analog-to-digital conversion through the analog-to-digital control chip. • Preparing digital commands to send to the smart transmitters (IMFEC11 only). • Reading and sending data to the controlling module (MFP/ MFC). The microprocessor directly links to eight kilobytes of random access memory. This memory serves as a storage area for process data and transmitter configuration information. The microprocessor coordinates analog-to-digital conversions through ADC circuitry. The microprocessor takes the converted process data it receives from the ADC circuitry and places it into a memory buffer. It remains in memory until the controlling module makes a request for process data or the microprocessor updates it with a new value. When the microprocessor receives a request for process data, it transfers that data from the memory buffer to a first in first out (FIFO) shift register where the controlling module can access it through the I/O expander bus interface.
