MVME2432 Motorola 嵌入式控制器 现场输入/输出模块

描述

MVME2432 MOTOROLA

干扰类型通常按干扰产生的原因、噪声干扰模式和噪声的波形质的不同划分。其中:按噪声产生的原因不同，分为放电噪声、浪涌噪声、高频振荡噪声等;按噪声的波形、质不同，分为持续噪声、偶发噪声等;按噪声干扰模式不同，分为共模干扰和差模干扰。共模干扰和差模干扰是一种比较常用的分类方法。共模干扰是信号对地的电位差，主要由电网串入、地电位差及空间电磁辐射在信号线上感应的共态(同方向)电压迭加所形成。共模电压有时较大，特别是采用隔离能差的配电器供电室

变送器输翰出信号的共模电压普遍较高，有的可高达130V以上。共模电压通过不对称电路可转换成差模电压，直接影响测控信号，造成元器件损坏(这就是一些系统IO模件损坏率较高的主要原因)，这种共模干扰可为直流、亦可为交流。差模干扰是指作用于信号两极间的干扰电压，主要由空间电磁场在信号间耦合感应及由不平衡电路转换共模干扰所形成的电压，这种让直接叠加在信号上，直接影响测量与控制精度。

MVME2432是摩托罗拉的一款嵌入式控制器，它采用摩托罗拉PowerPC架构的MPC8641D处理器，板载128MB DDR2内存，具有1路CAN，3路串口，1路网口，一路USB接口，支持Linux、VxWorks、QNX等多种操作系统，采用精简指令集，处理能力强，速度快，效率高，发热量低，稳定性好。

MVME2432的作用是进行I/A Series系统FBM（现场输入/输出模块）顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。输出模块的作用是将处理后的信号通过输出模块传送到现场执行机构，对生产过程进行调节控制。

MVME2432输出模块有有源输出和无源输出两种类型，有源输出模块输出信号稳定，无源输出模块输出信号受干扰影响较大。在工业应用中，通常采用有源输出模块。

PLC硬件组成

PLC的硬件主要由中央处理器(CPU)、存储器、输入单元、输出单元、通信接口、扩展接口、电源等部分组成。其中CPU是PLC的核心，按照系统程序赋予的功能，指挥PLC有条不紊地进行工作

MVME2432 Motorola 嵌入式控制器 现场输入/输出模块

Description

MVME2432 MOTOROLA

Interference types are usually divided according to the cause of interference, noise interference mode and noise waveform quality. Among them, according to the different causes of noise, it can be divided into discharge noise, surge noise, high-frequency oscillation noise, etc. According to the different waveform and quality of noise, it can be divided into continuous noise, accidental noise, etc. According to the different noise interference modes, it can be divided into common mode interference and differential mode interference. Common mode interference and differential mode interference are commonly used classification methods. Common-mode interference is the potential difference between the signal and the ground, which is mainly formed by the superposition of the common state (same direction) voltage induced by the power grid, the ground potential difference and the space electromagnetic radiation on the signal line. The common mode voltage is sometimes large, especially when the distributor supply room with poor isolation energy is used

change

The common mode voltage of the output signal is generally high, and some can be as high as 130V or more. The common mode voltage can be converted into a differential mode voltage through an asymmetric circuit, which directly affects the measurement and control signal, causing damage to components (this is the main reason for the high damage rate of some system IO modules), and this common mode interference can be DC or AC. Differential mode interference refers to the interference voltage between the two poles of the signal, which is mainly formed by the coupling induction of the spatial electromagnetic field between the signals and the conversion of common mode interference by the unbalanced circuit. This voltage is directly superimposed on the signal and directly affects the measurement and control accuracy.

MVME2432 is a MOTOROLA embedded controller, it uses MOTOROLA PowerPC architecture MPC8641D processor, onboard 128MB DDR2 memory, with 1 CAN, 3 serial ports, 1 network port, one USB interface, support Linux, VxWorks, QNX and other operating systems. Using reduced instruction set, strong processing power, fast speed, high efficiency, low heat, good stability.

The function of MVME2432 is to carry out I/A Series system FBM (field input/output module) sequence control, ladder logic control, accident recall processing, digital-to-analog conversion, input/output signal processing, data communication and processing. The function of the output module is to transmit the processed signal to the field actuator through the output module to regulate and control the production process.

MVME2432 output module has two types of active output and passive output, the active output module output signal is stable, the passive output module output signal is greatly affected by interference. In industrial applications, active output modules are usually used.

PLC hardware composition

The hardware of PLC is mainly composed of central processing unit (CPU), memory, input unit, output unit, communication interface, expansion interface, power supply and so on. Among them, CPU is the core of PLC, and commands PLC to work methodically according to the function given by the system program