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ADI公司的PLC参考设计
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ADI公司的PLC参考设计
shane
on Jan 20, 2013
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.
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
iso
Power 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
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)
attachments.zip
HappyDS
on Mar 16, 2017 9:07 PM
over 3 years ago
谢谢分享
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Amenda-NanYa
on Apr 23, 2017 9:46 PM
over 3 years ago
多谢分享
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