可编程逻辑控制器(PLC)系统利用各种类型的传感器和反馈机制， 通过收集、存储和分析数据，监测并控制机器或系统的相互影响。采集传感器数据会涉及对电压和电流等模拟变量的精密测量和处理，这要求传感器能够经常感应到非常小的变化。精度、漂移、噪声抑制和处理速度等都是这些系统的极重要特征。
　
　　ADI公司目前提供的PLC评估板是一种完整的工业过程控制演示系统，它具有四个隔离输入通道、一个带有RS-232接口的微处理器以及四个隔离输出通道。在25°C时，系统总精度为0.05%。输入通道具有24位分辨率(用AD8220仪表放大器和AD7793 Σ-Δ ADC)； 经过配置，每个通道均能配置为接受各种输入信号: 从4 mA ~ 20 mA电流环路到0 V ~ 5 V、0 V ~ 10 V、±5 V、±10 V的高压输入。它还能处理低电平输入，如来自RTD/热电偶传感器的输入等。输出模块具有16位分辨率(AD5422)，集成输出驱动器，并内置故障检测和保护功能。AD5422的可编程输出范围如下: 4 mA ~ 20 mA、0 V ~ 5 V、0 V ~ 10 V、±5 V、±10 V。每种范围均具有16位分辨率。完整设计采用ADI隔离技术、隔离的RS-232、处理器和电源管理产品，方便客户评估完整的信号链。

　　　
　　PLC评估板特性
　　可选输入: 0 mA ~ 20 mA、 4 mA ~ 20 mA、0 V ~ 5 V、 0 V ~ 10 V、 ±5 V、 ±10 V、 RTD、 TC
　　可编程输出: 0 mA ~ 20 mA、4 mA ~ 20 mA、0 V ~ 5 V、0 V ~ 10 V、±5 V、±10 V
　　4个隔离的24位模拟输入通道:
　　? AD7793: 24位Σ-Δ ADC，40 nV噪声
　　? ADR02: 5 V精密基准电压源
　　? AD8220: 仪表放大器，>80 dB CMRR
　　? ADuM5401: 集成isoPower?的隔离式DC-DC转换器， 500 mW输出功率
　　4个隔离的16位模拟输出通道:
　　? AD5422: 单通道、 16位、 串行输入、 内置电流源、 电压输出DAC
　　? 总非调整误差(TUE): 0.01%(典型值25°C)
　　? 单芯片解决方案
　　? 开路检测与保护电源/接口/控制
　　? ADuC7027: 采用ARM7? 内核的模拟MCU
　　? ADP3339: 高精度、 超低IQ、 LDO
　　? ADM3251E: 隔离式单通道RS-232线路驱动器/接收机
　
　　进一步了解设计人员如何利用ADI公司极具突破性的制造工艺， 满足最严苛的PLC系统应用要求:
iCMOS?工艺技术结合高压硅工艺与亚微米CMOS和互补双极性技术， 使模拟IC能够在30 V电压下工作， 并具有更小的尺寸、 更高的性能和更低的成本：  　　iCMOS?隔离技术基于芯片级变压器， 而非LED和光电二极管， 可以与CMOS半导体功能相集成， 实现低成本隔离:www.analog.com/iCouplerPCI-5B39-04 Block 0-20mA current-output, ±5V b signal conditioning block.  A-B 1756L55M24 模块
PCI-5B39-05 Block 0-20mA current-output, 0-20mA b signal conditioning block.
PCI-5B39-07 Block ±20mA current-output, ±10V b signal conditioning block.
PCI-5B40-01 Block ±10mV wide-band voltage-b, ±5V output signal conditioning block.
PCI-5B40-02 Block ±50mV wide-band voltage-b, ±5V output signal conditioning block.
PCI-5B40-03 Block ±100mV wide-band voltage-b, ±5V output signal conditioning block.
PCI-5B40-04 Block ±10mV wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B40-05 Block ±50mV wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B40-06 Block ±100mV wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B41-01 Block ±1V wide-band A-B 1756L55M24 模块  voltage-b, ±5V output signal conditioning block.
PCI-5B41-02 Block ±5V wide-band voltage-b, ±5V output signal conditioning block.
PCI-5B41-03 Block ±10V wide-band voltage-b, ±5V output signal conditioning block.
PCI-5B41-04 Block ±1V wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B41-05 Block ±5V wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B41-06 Block ±10V wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B41-07 Block ±20V wide-band voltage-b, ±5V output signal conditioning block.
PCI-5B41-08 Block ±20V wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B41-09 Block ±40V wide-band voltage-b, ±5V output signal conditioning block.
PCI-5B41-10 Block ±40V wide-band voltage-b, 0-5V output signal conditioning block.
PCI-5B42-01 Block 2-wire transmitter interface signal conditioning block.
PCI-5B42-02 Block 2-wire transmitter interface signal conditioning block.
PCI-5B45-01A Block 0-500Hz frequency-b signal conditioning block.
PCI-5B45-02A Block 0-1kHz frequency-b signal conditioning block.
PCI-5B45-03A Block 0-3kHz frequency-b signal conditioning block.
PCI-5B45-04A Block 0-5kHz frequency-b signal conditioning block.
PCI-5B45-05A Block 0-10kHz A-B 1756L55M24 模块  frequency-b signal conditioning block.
PCI-5B45-06A Block 0-25kHz frequency-b signal conditioning block.
PCI-5B45-07A Block 0-50kHz frequency-b signal conditioning block.
PCI-5B45-08A Block 0-100kHz frequency-b signal conditioning block.
PCI-5B45-09A Block 0-250kHz frequency-b signal conditioning block.
PCI-5B47B-11 Block Type B linearized (500 to 1800 C) thermocouple-b signal conditioning block.
PCI-5B47J-01 Block Type J linearized (0 to 760 C) thermocouple-b signal conditioning block.
PCI-5B47J-02 Block Type J linearized (-100 to 300 C) thermocouple-b signal conditioning block.
PCI-5B47J-03 Block Type J linearized (0 to 500 C) thermocouple-b signal conditioning block.
PCI-5B47K-04 Block Type K linearized  A-B 1756L55M24 模块  (0 to 1000 C) thermocouple-b signal conditioning block.
PCI-5B47K-05 Block Type K linearized (0 to 500 C) thermocouple-b signal conditioning block.
PCI-5B47K-13 Block Type K linearized (-100 to 1350 C) thermocouple-b signal conditioning block.
PCI-5B47K-14 Block Type K linearized (0 to 1200 C) thermocouple-b signal conditioning block.
PCI-5B47K-15 Block Type N linearized (-100 to 1300 C) thermocouple-b signal conditioning block.
PCI-5B47R-09 Block Type R linearized (500 to 1750 C) thermocouple-b signal conditioning block.
PCI-5B47S-10 Block Type S linearized (500 to 1750 C) thermocouple-b signal conditioning block.
PCI-5B47T-06 Block Type T linearized (-100 to 400 C) thermocouple-b signal conditioning