Sign In Help
Schneider Electric
HelpSign In
Schneider Electric Exchange
  • Home
  • Collaborate
  • Develop
  • Shop
Home Collaborate Develop Shop Log in or Register Help

Invite a Co-worker

Send a co-worker an invite to the Exchange portal.Just enter their email address and we’ll connect them to register. After joining, they will belong to the same company.
You have entered an invalid email address. Please re-enter the email address.
This co-worker has already been invited to the Exchange portal. Please invite another co-worker.
Please enter email address
Send Invite Cancel

Invitation Sent

Your invitation was sent.Thanks for sharing Exchange with your co-worker.
Send New Invite Close
  • Home
  • Collaborate
  • Exchange Community
  • :
  • Knowledge Center
  • :
  • Building Automation Knowledge Base
  • :
  • How to read individual bits from a Modbus Holding Register
Community Menu
  • Forums
    • By Topic
        • EcoStruxure IT
          • EcoStruxure IT forum
        • Industrial Automation
          • Industry Automation and Control Forum
          • Alliance System Integrators Forum
          • Machine Solutions in the Digital Transformation
          • EcoStruxure Automation Expert / IEC 61499 Forum
          • Industrial Edge Computing Forum
          • Level and Pressure Instrumentation Forum
          • Modicon User Group
          • PLC Club Indonesia
          • SEE Automation Club Forum
          • Fabrika ve Makina Otomasyonu Çözümleri
          • Форум по промышленной автоматизации СНГ
        • SCADA & Telemetry Solutions
          • Geo SCADA Expert Forum
          • SCADA and Telemetry Devices Forum
        • Power Distribution IEC
          • Power Distribution and Digital
          • Power Standards & Regulations
          • Paneelbouw & Energie Distributie
          • Eldistribution & Fastighetsautomation
        • Power Distribution Softwares
          • EcoStruxure Power Design Forum
          • SEE Electrical Building+ Forum
          • LayoutFAST User Group Forum
        • Wireless Information Network Solutions
          • Instrument Area Network
          • Remote Monitoring
          • Tank Level Monitoring
          • Remote Data Collection
        • Solutions for your Business
          • Solutions for Food & Beverage Forum
          • Solutions for Healthcare Forum
    • By Segment
        • Food & Beverage
          • Solutions for Food & Beverage Forum
        • Healthcare
          • Solutions for Healthcare Forum
      • EcoStruxure IT
        • EcoStruxure IT forum
      • Industrial Automation
        • Industry Automation and Control Forum
        • Alliance System Integrators Forum
        • Machine Solutions in the Digital Transformation
        • EcoStruxure Automation Expert / IEC 61499 Forum
        • Industrial Edge Computing Forum
        • Level and Pressure Instrumentation Forum
        • Modicon User Group
        • PLC Club Indonesia
        • SEE Automation Club Forum
        • Fabrika ve Makina Otomasyonu Çözümleri
        • Форум по промышленной автоматизации СНГ
      • SCADA & Telemetry Solutions
        • Geo SCADA Expert Forum
        • SCADA and Telemetry Devices Forum
      • Power Distribution IEC
        • Power Distribution and Digital
        • Power Standards & Regulations
        • Paneelbouw & Energie Distributie
        • Eldistribution & Fastighetsautomation
      • Power Distribution Softwares
        • EcoStruxure Power Design Forum
        • SEE Electrical Building+ Forum
        • LayoutFAST User Group Forum
      • Wireless Information Network Solutions
        • Instrument Area Network
        • Remote Monitoring
        • Tank Level Monitoring
        • Remote Data Collection
      • Solutions for your Business
        • Solutions for Food & Beverage Forum
        • Solutions for Healthcare Forum
      • Food & Beverage
        • Solutions for Food & Beverage Forum
      • Healthcare
        • Solutions for Healthcare Forum
  • Blogs
    • By Topic
        • Industrial Automation
          • Industrial Edge Computing Blog
          • Industry 4.0 Blog
          • Industrie du Futur France
        • SCADA & Telemetry Solutions
          • SCADA and Telemetry Blog
        • Power Distribution IEC
          • Power Events & Webinars
          • Power Foundations Blog
        • Power Distribution NEMA
          • NEMA Power Foundations Blog
        • Power Distribution Softwares
          • EcoStruxure Power Design Blog
          • SEE Electrical Building+ Blog
        • Solutions for your Business
          • Solutions for Food & Beverage Blog
          • Solutions for Healthcare Blog
          • Solutions for Retail Blog
        • Community experts & publishers
          • Publishers Community
    • By Segment
        • Food & Beverage
          • Solutions for Food & Beverage Blog
        • Healthcare
          • Solutions for Healthcare Blog
        • Retail
          • Solutions for Retail Blog
      • Industrial Automation
        • Industrial Edge Computing Blog
        • Industry 4.0 Blog
        • Industrie du Futur France
      • SCADA & Telemetry Solutions
        • SCADA and Telemetry Blog
      • Power Distribution IEC
        • Power Events & Webinars
        • Power Foundations Blog
      • Power Distribution NEMA
        • NEMA Power Foundations Blog
      • Power Distribution Softwares
        • EcoStruxure Power Design Blog
        • SEE Electrical Building+ Blog
      • Solutions for your Business
        • Solutions for Food & Beverage Blog
        • Solutions for Healthcare Blog
        • Solutions for Retail Blog
      • Community experts & publishers
        • Publishers Community
      • Food & Beverage
        • Solutions for Food & Beverage Blog
      • Healthcare
        • Solutions for Healthcare Blog
      • Retail
        • Solutions for Retail Blog
  • Ideas
        • Industrial Automation
          • Modicon Ideas & new features
        • SCADA & Telemetry Solutions
          • Geo SCADA Expert Ideas
          • SCADA and Telemetry Devices Ideas
  • Knowledge Center
    • Building Automation Knowledge Base
    • Industrial Automation Knowledge Base
    • Industrial Automation How-to videos
    • SCADA & Telemetry Solutions Knowledge Base
    • Digital E-books
    • Success Stories Corner
    • Power Talks
  • Events & Webinars
    • Innovation Talks
    • Innovation Summit
    • Let's Exchange Series
    • Technology Partners
  • Support
    • Ask Exchange
    • Leaderboard
    • Our Community Guidelines
    • Community User Guide
    • How-To & Best Practices
    • More
Join Now
How can we help?
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 
51304members
Join Now
245511posts
Join Now

How to read individual bits from a Modbus Holding Register

Back to Building Automation Knowledge Base
Options
  • Article History
  • Subscribe to RSS Feed
  • Bookmark
  • Subscribe
  • Email to a Friend
  • Printer Friendly Page
  • Report Inappropriate Content
0 Likes
4910 Views
Trying to translate this page to your language?
Select your language from the translate dropdown in the upper right. arrow
Translate to: English
  • (Français) French
  • (Deutsche) German
  • (Italiano) Italian
  • (Português) Portuguese
  • (Русский) Russian
  • (Español) Spanish

How to read individual bits from a Modbus Holding Register

Picard Product_Support
‎2018-09-07 02:33 PM

Last Updated: Admiral DavidChild Admiral ‎2020-04-22 02:40 AM

Issue

How to read individual bits from a Modbus Holding Register that holds a 16-Bit Word and represent each Bit as a separate Digital point

Product Line

EcoStruxure Building Operation

Environment

  • Building Operation Enterprise Server
  • Building Operation Automation Server (AS, AS-P, AS-B)
  • Modbus TCP/IP
  • Modbus RTU (RS485)

Cause

There is a requirement for a Modbus Holding Register that is a 16-bit unsigned value, each bit represents a digital state in the Modbus device and to replicate this as 16 separate digital states in EBO. The 16-bit unsigned value is an integer with a range of 0 to 65,535 and needs to be converted into 16 digital values.

Resolution

Use a Modbus Digital Input point for each bit required. Each object will be configured to read the same Modbus register address, but with a different bitmask value applied prior to evaluating the value.

For example: Read Modbus Holding Register 40123 with a value of 32769 (16-bit unsigned) and decode bits 0, 8, and 15 as three separate Digital points

Since the actual Value of 32769 being read at address 40123 is shown in Binary as 1000000000000001 it can be seen that Bit 0 and Bit 15 should return TRUE while Bit 8 should return FALSE

Configure each point as follows:

  • Modbus Digital Input Point 40123 bit 0
  • Register number 123
  • Register type 16 bit unsigned
  • Read function code 03
  • Bit mask - enable only Bit 0

 

  • Modbus Digital Input Point 40123 bit 8
  • Register number 123
  • Register type 16 bit unsigned
  • Read function code 03
  • Bit mask - enable only Bit 8

 

  • Modbus Digital Input Point 40123 bit 15
  • Register number 123
  • Register type 16 bit unsigned
  • Read function code 03
  • Bit mask - enable only Bit 15

 

Additional information can be found in the EcoStruxure Building Operation - Technical Reference Guide - Search for Bitmask.

Labels (1)
Labels:
  • EcoStruxure Building Operation
Tags (3)
  • Find more articles tagged with:
  • 15375
  • DavidShore20
  • PeterLarsen20
Was this article helpful? Yes No
100% helpful (1/1)
Contributors
  • DavidChild
    DavidChild
  • DavidFisher
    DavidFisher
  • Dave_Shore
    Dave_Shore
  • WaynePeters
    WaynePeters
  • David_Kendrick
    David_Kendrick
  • Product_Support
    Product_Support
Support

Have a question? Please contact us with details, and we will respond.

Contact Us
FAQ

Look through existing questions to find popular answers.

Learn More
About

Want to know more about Exchange and its possibilities?

Learn More

Full access is just steps away!

Join Exchange for FREE and get unlimited access to our global community of experts.

Connect with Peers & Experts

Discuss challenges in energy and automation with 30,000+ experts and peers.

Get Support in Our Knowledge Base

Find answers in 10,000+ support articles to help solve your product and business challenges.

Ask Questions. Give Solutions

Find peer based solutions to your questions. Provide answers for fellow community members!

Register today for FREE

Register Now

Already have an account?Log in

About Us FAQ Terms & Conditions Privacy Notice Change your cookie settings
©2020, Schneider Electric