Jump to content

Search the Community

Showing results for tags 'read_var'.

  • Search By Tags

    Type tags separated by commas.

  • Search By Author

Content Type


Forums

  • PLCs and Supporting Devices
    • General Topics - The Lounge
    • Allen Bradley / Rockwell Automation
    • Omron
    • Mitsubishi
    • Siemens
    • Automation Direct
    • GE / Emerson
    • Festo
    • Modicon / Telemecanique / Schneider Electric
    • Other PLCs
    • Download Comments

Categories

  • Allen Bradley
    • PLC Sample Code
    • HMI Sample Code
    • Demo Software
    • Manuals, Tutorials
  • GE
    • PLC Sample Code
    • HMI Sample Code
    • Demo Software
    • Manuals, Tutorials
  • Omron
    • PLC Sample Code
    • HMI Sample Code
    • Demo Software
    • Manuals
    • Tutorials and Quickstarts
    • Tech and Application Notes
    • Other Omron Products
    • Utilities
  • Mitsubishi
    • PLC Sample Code
    • HMI Sample Code
    • Demo Software
    • Manuals, Tutorials
  • Modicon
    • PLC Sample Code
    • HMI Sample Code
    • Demo Software
    • Manuals, Tutorials
  • Automation Direct
    • PLC Sample Code
    • HMI Sample Code
    • Demo Software
    • Manuals, Tutorials
  • Siemens
    • PLC Sample Code
    • HMI Sample Code
    • Demo Software
    • Manuals, Tutorials
  • Miscellaneous
    • Tutorials and Guides
    • Hugh Jack, Ph.D., PLC Books
    • Robots and Servos
    • Vision Systems
    • Other PLC Demo Software
    • Free Utilities

Find results in...

Find results that contain...


Date Created

  • Start

    End

Last Updated

  • Start

    End

Filter by number of...

Joined

  • Start

    End

Group

WhatsApp

WeChat

Line

Telegram

Discord

AIM

MSN

Yahoo

Skype

Location

Interests

Found 2 results

  1. saruans
    hello, Somebody have suggest how need read data from slave using modbus RTU. I am using M241 PLC and read_var function. The picture you can see my PLC program. The data of slave is placed 3394 address. Then I try to read, always "READ_VAR" function get "CommError" which number is 254 that means "The detected operation error contains protocol- specific code" and "OpenError" which number is 3 that means I don't know. How need read from slave data, which modbuss adress is 3394?
  2. MbarrettAlpha
    Hi all, currently as part of a project I am trying to communicate between a Schneider M340 plc and an Allen Bradley micrologix processor. I am programming the M340 and the micrologix has been installed by another supplier. they have mapped the Modbus registers on their side and given me a spreadsheet with these. I am able to read values with no issue but I cannot write values back. i've included a screenshot or the read_var and write_var instructions I am using. I would really appreciate any help if anyone has any insight on this Mark
×
×
  • Create New...