Download
Share
Print this page
Advantech iDAQ-871 User Manual
  1. Manuals
  2. Brands
  3. Advantech Manuals
  4. Control Unit
  5. iDAQ-871
  6. User manual
Advantech iDAQ-871 User Manual

Advantech iDAQ-871 User Manual

Bridge input industrial daq modules
Hide thumbs

Advertisement

Quick Links

Download this manual
User Manual
iDAQ-871/873
Bridge Input Industrial DAQ
Modules

Advertisement

loading
Need help?

Need help?

Do you have a question about the iDAQ-871 and is the answer not in the manual?

Questions and answers

Related Manuals for Advantech iDAQ-871

Summary of Contents for Advantech iDAQ-871

  • Page 1 User Manual iDAQ-871/873 Bridge Input Industrial DAQ Modules...

  • Page 2: Product Warranty (2 Years)

    No part of this manual may be reproduced, copied, translated, or transmitted in any form or by any means without the prior written permission of Advantech Co., Ltd. The information provided in this manual is intended to be accurate and reliable.

  • Page 3: Declaration Of Conformity

    This product has passed the CE test for environmental specifications when shielded cables are used for external wiring. We recommend the use of shielded cables. This type of cable is available from Advantech. Please contact your local supplier for ordering information.

  • Page 4: Warnings, Cautions, And Notes

    Document Feedback To assist us with improving this manual, we welcome all comments and constructive criticism. Please send all such feedback in writing to support@advantech.com. Packing List Before system installation, check that the items listed below are included and in good condition.

  • Page 5: Safety Instructions

    In accordance with IEC 704-1:1982 specifications, the sound pressure level at the operator's position does not exceed 70 dB (A). DISCLAIMER: These instructions are provided according to IEC 704-1 standards. Advantech disclaims all responsibility for the accuracy of any statements contained herein. iDAQ-871_873 User Manual...

  • Page 6: Consignes De Sécurité

    Conformément à la norme CEI 704-1:1982, l’opérateur ne doit pas experimenter un niveau sonore supérieur à 70 dB (A). AVERTISSEMENT: Ces consignes suivent la norme CEI 704-1. Advantech décline toute responsabilité concernant l'exactitude des déclarations con- tenues dans ce document. iDAQ-871_873 User Manual...

  • Page 7: Safety Precautions - Static Electricity

    Safety Precautions - Static Electricity Follow these simple precautions to protect yourself from harm and the products from damage. To avoid electrical shock, always disconnect the power from the PC chassis  before manual handling. Do not touch any components on the CPU card or other cards while the PC is powered on.
  • Page 8 iDAQ-871_873 User Manual viii...

  • Page 9: Table Of Contents

    2.3.4 Pin Assignment ................11 Figure 2.10Pin Assignment Diagram of iDAQ-871 ..... 11 Table 2.1: Pin Assignment Diagram of iDAQ-871 ..... 12 Figure 2.11Pin Assignment Diagram of iDAQ-873 ..... 12 Table 2.2: Pin Assignment Diagram of iDAQ-873 ..... 12 Chapter Function Details.........13...
  • Page 10 Figure 3.25Device Information of iDAQ-871....... 31 Appendix A Specifications........33 Bridge Input..................... 34 Table A.1: Bridge Input specification of iDAQ-871 and iDAQ-873. Table A.2: Filter type in different sampling rate setting....34 Figure A.1 Frequency response of FIR filter under different sam- pling rates..............35...
  • Page 11 Table A.6: Power Consumption ..........37 General ....................37 Function Block..................38 Appendix B System Dimensions ......39 System Dimensions ................40 Figure B.1 System Dimensions - iDAQ-871 ....... 40 Figure B.2 System Dimensions - iDAQ-873 ....... 41 iDAQ-871_873 User Manual...
  • Page 12 iDAQ-871_873 User Manual...

  • Page 13: Start Using Idaq-871/873

    Chapter Start Using iDAQ-871/...

  • Page 14: Overview

    Both iDAQ-871 and iDAQ-873 are 24-bit bridge type acquisition modules. The iDAQ-871 is a 4-channel acquisition module that sup- ports various bridge inputs (full, half, and quad bridges) and offers multiple resistance and excitation voltages to accommodate different types of strain gauges.

  • Page 15: Product Features

    Driver Installation The driver package could be found on Advantech Support Portal (https://www.advan- tech.com/support). Search for iDAQ on the support portal, then the corresponding driver/SDK package can be found. You’ll get the XNavi installer after the download session finishes.

  • Page 16: Software Utility

    All these software packages are available on the Advantech website: http://www.advantech.com/. The Advantech Navigator is a utility that allows you to set up, configure and test your device, and later store your settings in a proprietary database.

  • Page 17: Chapter 2 Installation Guide

    Chapter Installation Guide...

  • Page 18: Initial Unpacking Check

    Initial Unpacking Check Before you install your iDAQ modules, please make sure you have the following nec- essary components when unpacking the package: DAQ module*1  Startup manual*1  If anything in the packing list is missing, please contact your local support for further assistance.

  • Page 19: Signal Connection And Pin Assignment

    Signal Connection and Pin Assignment The iDAQ-871 offers a choice of three bridge completion types based on the sensor connected to the module, whereas the iDAQ-873 is specifically designed for quarter- bridge applications. Details regarding field wiring connections and pin assignments for each module are provided in the following section.
  • Page 20 One wire is used to connect both QTR/SC+ and AI+ terminals (QTR/SC and AI for iDAQ-873). However, shunt calibration in this configuration will results in more error due to imbalance of lead wire resistance (R LEAD Figure 2.4 2-wire quarter-bridge input signal connection for iDAQ-871 iDAQ-871_873 User Manual...

  • Page 21: Half-Bridge Input Signal Connection

    Figure 2.5 2-wire quarter-bridge input signal connection for iDAQ-873 2.3.2 Half-Bridge Input Signal Connection For half-bridge input, two of the four bridge arms are external sensing elements, hence the name. The other two arms are provided, or completed, by device's internal resistors.

  • Page 22: Full-Bridge Input Signal Connection

    If remote sensing is required, connect the RS+ terminal to one end of the strain gauge (R ) by an independent wire, and connect the RS- terminal to the other end ) by another independent wire, as shown in Figure 2.7 Do not share the same wire for RS and EX terminals.

  • Page 23: Pin Assignment

    ) by another independent wire, as shown in Figure 2.9. Do not share the same wire for RS and EX terminals. Figure 2.9 Full-bridge input with remote sensing signal connection 2.3.4 Pin Assignment iDAQ-871 Figure 2.10 Pin Assignment Diagram of iDAQ-871 iDAQ-871_873 User Manual...
  • Page 24 Table 2.1: Pin Assignment Diagram of iDAQ-871 Pin Name Pin Number Description RS<0..3>+ 3, 8, 13, 18 Remote sensing positive terminal. RS<0..3>- 4, 9, 14, 19 Remote sensing negative terminal. EX<0..3>+ 23, 27, 33, 37 Excitation voltage positive terminal. EX<0..3>- 20, 24, 30, 34 Excitation voltage negative terminal.

  • Page 25: Chapter 3 Function Details

    Chapter Function Details...

  • Page 26: Bridge Input Overview

    Bridge Input Overview This section gives a brief introduction to the architecture and operation of the bridge input circuit, which is also called a Wheatstone bridge. In addition, there are several methods to correct the error in bridge input measurement, including remote sensing, offset nulling, and shunt calibration, are described.

  • Page 27: Error Correction In Bridge Input Measurement

    Figure 3.2 Ratiometric measurement 3.1.2 Error Correction in Bridge Input Measurement Field wiring is used to connect sensors to measurement devices that have a non- zero resistance, and resistance of each bridge arm also has errors. These undesired factors create errors in bridge input measurement. The device provides mechanisms to correct the errors: remote sensing, offset nulling, and shunt calibration.
  • Page 28 Figure 3.3 Voltage drop due to lead resistance As shown in Figure 3.4, instead of using excitation voltage source output as the volt- age reference of the ADC, in remote sensing, two additional wires (indicated by green lines) that connect to the bridge directly measure the voltage across the bridge, and use this value as the voltage reference of the ADC.

  • Page 29: Strain Gauge Sensor Configurations

    3.1.2.2 Offset Nulling In fact, output of the bridge may not be 0 V even when not loaded. This is because slight variations in resistance among the bridge arms generate nonzero offset volt- age. Offset nulling performs software compensation for this offset voltage. The software will first measure the bridge output when not loaded and stored it as an initial value.

  • Page 30: Half Bridge Type I Configuration

    Strain value can be calculated by the following equation: strain    --------------------------------  GF 1 –   where GF is the gauge factor of the strain gauge sensor provided by the sensor man- strained  V unstrained -------------------------------------------------------------------------------------- - ufacturer, Vr is the ratiometric bridge output value measured by the ADC –...

  • Page 31: Half Bridge Type Ii Configuration

    3.2.3 Half Bridge Type II Configuration This section provides information for the half-bridge type II strain gauge sensor con- figuration. This configuration measures either axial or bending strain. Figure 3.7 shows how to position the strain gauge sensors in both axial and bending configura- tions.

  • Page 32: Half Bridge Type Iii Configuration

    3.2.4 Half Bridge Type III Configuration This section provides information for the half-bridge type III strain gauge sensor con- figuration. This configuration only measures bending strain. Figure 3.8 shows how to position the strain gauge sensors in bending configuration. Refer to 2.3.2 Half-Bridge Input Signal Connection for detailed signal wiring of this configuration.

  • Page 33: Full Bridge Type I Configuration

    3.2.5 Full Bridge Type I Configuration This section provides information for the full-bridge type I strain gauge sensor config- uration. This configuration only measures bending strain. Figure 3.9 shows how to position the strain gauge sensors in bending configuration. Refer to 2.3.3 Full-Bridge Input Signal Connection for detailed signal wiring of this configuration.

  • Page 34: Full-Bridge Type Ii Configuration

    3.2.6 Full-Bridge Type II Configuration This section provides information for the full-bridge type II strain gauge sensor config- uration. This configuration only measures bending strain. Figure 3.10 shows how to position the strain gauge sensors in bending configuration. Refer to 2.3.3 Full-Bridge Input Signal Connection for detailed signal wiring of this configuration.

  • Page 35: Full-Bridge Type Iii Configuration

    3.2.7 Full-Bridge Type III Configuration This section provides information for the full-bridge type III strain gauge sensor con- figuration. This configuration only measures axial strain. Figure 3.11 shows how to position the strain gauge sensors in axial configuration. Refer to 2.3.3 Full-Bridge Input Signal Connection for detailed signal wiring of this configuration.

  • Page 36: Force, Pressure, And Torque Sensor Configuration

    Refer to 2.3.3 Full-Bridge Input Signal Connection for detailed signal wiring of this configuration. In Advantech DAQNavi, linear scaling for bridge-based force, pressure, and torque sensors is based on two points which are specified as pairs of corresponding physi- cal and electrical values: “EV...

  • Page 37: Analog Input Methods

    Analog Input Methods 3.4.1 Instant Analog Input Acquisition With instant analog input acquisition, the software controls the sample timing. The analog-to-digital converter (ADC) is continuously converting analog input signals by its maximum allowable conversion rate. Each time the software sends a “read instant analog input sample”...

  • Page 38: Buffered Analog Input Acquisition

    3.4.2 Buffered Analog Input Acquisition With buffered analog input acquisition, the ADC conversion rate and the duration of the acquisition is controlled by hardware timing signals. All conversion results are sampled and stored in the buffer memory before sending back to the host computer as shown in Figure 3.13.

  • Page 39: Buffered Analog Input Configuration

    The start and stop of acquisition can also be delayed in number of samples after receiving the corresponding trigger signal. As shown in Figure 3.15, the start of acquisition is delayed by 3 samples after receiving a start trigger, and the stop of acquisition is delayed by 2 samples after receiving a stop trigger.
  • Page 40 The start trigger can be a software command or a hardware signal. If a hardware sig- nal is used as the start trigger, the start of acquisition can be delayed for a specified number of sample clock cycles after a start trigger is received. Figure 3.17 shows an example of a 2-sample delay post-trigger acquisition.

  • Page 41: Streaming Analog Input Acquisition

    3.5.1.3 About-Trigger Acquisition An about-trigger acquisition is the same as a pre-trigger acquisition except that the time when the acquisition stops can be delayed by a specified number of sample clock cycles. Figure 3.19 shows an example of a 5-sample about-trigger acquisition with 2 cycles of stop delay.

  • Page 42: Retriggerable Analog Input Acquisition

    3.5.3 Retriggerable Analog Input Acquisition The acquisition can be re-triggerable. When re-trigger is enabled, after the acquisi- tion stops, it restarts whenever the required trigger is received, and reconfiguration of the acquisition is not required. Figures 3.21 to 3.24 show examples of retrigger acquisition for post-trigger, pre-trig- ger, about-trigger, and streaming acquisitions, respectively.

  • Page 43: Device Description And Configuration

    You can change the description in Navigator, or just leave it as default. The descrip- tion is used in your own program, in order to get control or device handler from the device. Figure 3.25 Device Information of iDAQ-871 iDAQ-871_873 User Manual...
  • Page 44 iDAQ-871_873 User Manual...

  • Page 45: Appendix A Specifications

    Appendix Specifications...

  • Page 46: Bridge Input

    Bridge Input Table A.1: Bridge Input specification of iDAQ-871 and iDAQ-873 Item iDAQ-871 iDAQ-873 ADC Resolution 24-bit Channels ±1 V/V, ±500 mV/V, ±250 mV/V, ±125 mV/V, ±62.5 mV/V, ±31.25 mV/V, ±15.63 mV/V, or ±7.81 mV/V Input Range Auto configured by software according to physical input range...
  • Page 47 Figure A.1 Frequency response of FIR filter under different sampling rates Figure A.2 Frequency response of SINC1 filter under different sampling rates (16.66 SPS to 400 SPS) Figure A.3 Frequency response of SINC1 filter under different sampling rates (1.2 kSPS to 7.2 kSPS) iDAQ-871_873 User Manual...
  • Page 48 Figure A.4 Frequency response of SINC5 filter under different sampling rates Isolation protection: 600 V , Channel to FGND  Accuracy  Operating temperature within ±5°C of last, system-calibration temperature (25°C) Table A.3: Accuracy ±1 V/V ±500mV/V ±250mV/V ±125mV/V ±62.5mV/V ±31.25 mV/V ±15.63 mV/V ±7.81 mV/V Gain Calibrated ±0.05%...

  • Page 49: Trigger

    Trigger delay range: 0 ~ 16,777,215 samples  Sample number: 0 ~ 16,777,215 samples  Power Consumption Table A.6: Power Consumption Typical Maximum iDAQ-871 0.8W 2.1W iDAQ-873 2.6W General Form factor: iDAQ Module  Dimension: 100 x 80 x 25 mm (3.94 x 3.15 x 0.98 in.) ...

  • Page 50: Function Block

    Function Block iDAQ-871 iDAQ-873 iDAQ-871_873 User Manual...

  • Page 51: Appendix B System Dimensions

    Appendix System Dimensions...

  • Page 52: System Dimensions

    System Dimensions iDAQ-871 Figure B.1 System Dimensions - iDAQ-871 iDAQ-871_873 User Manual...
  • Page 53 iDAQ-873 Figure B.2 System Dimensions - iDAQ-873 iDAQ-871_873 User Manual...
  • Page 54 No part of this publication may be reproduced in any form or by any means, such as electronically, by photocopying, recording, or otherwise, without prior written permission from the publisher. All brand and product names are trademarks or registered trademarks of their respective companies. © Advantech Co., Ltd. 2024...

This manual is also suitable for:

Idaq-873