shane

ADI公司的PLC参考设计

shane 在 2013-1-21 建立的討論區
最後回覆由Amenda-NanYa於2017-4-24提供

PLC DEMO SYSTEM

 

 


The PLC board is a complete Industrial Process Control Demo system. It has four
isolated input channels and four isolated output channels. Total system accuracy
is 0.05%. The input channels have 24 bit resolution (using AD8220 IN-AMP + AD7793 Sigma Delta
ADC), each channel can be configured to accept a wide variety of input signals,
from 4-20ma current loops to to high voltage inputs 0-5, 0-10v, +/-5v, +/-10v.
It can also accommodate RTD/TC inputs. The output module has 16 bit resolution
(AD5422) which has an integrated output driver and built in fault detection and
protection. The AD5422 has the following programmable output ranges, 4-20ma,
0-5v, 0-10v, +/-5v, +/-10v. Each range has 16 bits of resolution. The complete
design uses ADI isolation technology, processors and power management products,
allowing customers to evaluate the whole signal chain.

 

点击看大图
PLC DEMO SYSTEM

Features

 


  • Inputs Selectable: 0-20mA, 4-20mA, 0-5V, 0-10V, ±5V, ±10V, RTD, TC
  • Outputs Programmable: 0-20mA, 4-20mA, 0-5V, 0-10V, ±5V, ±10V
  • FOUR ISOLATED 24 BIT ANALOG INPUT CHANNELS

    • AD7793 24 Bit
      Sigma Delta ADC, 40nV Noise
    • ADR02 Precision
      5V Ref
    • AD8220
      Instrumentation Amplifier, >80db CMRR
    • ADUM5401
      isoPower integrated, isolated dc-to-dc converter 500 mW output power
  • FOUR ISOLATED 16 BIT ANALOG OUTPUT CHANNELS

    • AD5422 Single
      Channel, 16-Bit, Serial Input, Current Source & Voltage Output DAC
    • 0.05% Total Unadjusted Error (TUE)
    • Single Chip Solution
    • Open and Short Detection and Protection
  • POWER/INTERFACE/CONTROL

    • ADI ARM 7 ADUC7027
    • ADP3339 High
      Accuracy Ultralow Iq, LDO
    • ADM3251 Isolated
      Single Channel RS-232 Line Driver/Receiver

 

 

点击看大图
PLC Total Solution Diagram

Documentation

 


The following Technical Note describes the PLC reference
design/evaluation system.
To download the Documentation, select the link
below

 

PLC Reference Design/Evaluation System, Industrial Process Control
Evaluation System
(pdf,
1,109,925 bytes)

 

 

Source Code

 


The source code was written for ADUC7027 to perform basic
communications with on board data converters. The description of files included
are:

 


  • main.c - Implements data comms between PC and PLC Design Board.
  • plcbios.c - Contains the drivers for ADC/DAC communications.
  • plcbios.h - Header File for PLCBIOS.C/ADUC7027
  • AD7793.h - Header File for AD7793 ADC.
Download Source Code (zip, 6,430 bytes)

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