Software Toolbox Technical Blog

Modbus Offset vs. Addressing: Why Does It Matter?

7 min read

By Ryan Royse on Mar 21, 2024 2:00:00 PM

Have you ever been confused on the difference between Modbus offsets and addresses? I’m sure you may have configured different Modbus devices from different manufacturers who follow different documentation standards, especially for memory mapping. As we all know, that can certainly increase implementation time. In this blog post, we are going to dive into how offsets and addresses compare and differ to hopefully provide a better understanding, cutting down that configuration time when using TOP Server. Before we start comparing offsets and addressing, let’s first get an understanding of what both are.

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Why Are My Data Values Wrong? - Exploring Modbus TOP Server Settings

12 min read

By Ryan Royse on Jan 11, 2024 2:00:00 PM

In the world of industrial automation and control systems, communication protocols play a crucial role in ensuring seamless data exchange between devices. Modbus started as a protocol used in Modicon, now Schneider Electric, PLCs in the 1970’s. It was adopted across the industry for its clarity and simplicity. With any protocol, including and especially with Modbus, there are areas where the parties to the communication, the client and server, can interpret the bit stream of data differently once exchanged because the Modbus protocol specification does not speak to those interpretations.

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Tech Support Corner: Configuring TOP Server as a Modbus Device/Server

8 min read

By Ganesh Kalipershad on Mar 2, 2023 2:00:00 PM

With Modbus having been around since 1979, I’m sure you have had some interaction with it or at least awareness of it if you work in the automation industry. Our TOP Server is very widely used for its Modbus TCP/IP Ethernet Driver and variety of Modbus serial drivers to enable users to connect to any Modbus devices that they have in the field. For that common use case, the device is the Modbus Server, and the TOP Server is the Modbus Client.

But what if you needed to configure TOP Server to be the Modbus TCP/IP Server (i.e. the “device”)? That is the purpose of this next post in our continuing Tech Support Corner blog series – to discuss and tell you how you can configure TOP Server to act as a Modbus server device, which is a common need for systems where either a device or other software application can only act as a Modbus Client and you have other systems that need connectivity to that Modbus client.

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Video Tutorial: Real-Time Collection for Modbus Devices

2 min read

By Lauren Conrad on Oct 13, 2022 2:00:00 PM

Modbus is one of the most widely used protocols around the world, implemented as the communications protocol by many different vendors for integration with other systems. If you're reading this, you likely have at least one Modbus device (whether it's a PLC, RTU or other device) being used in your industrial process and need to integrate data from that process.

In this video blog, I'll show you how to get started using our Modbus TCP Ethernet driver and it's flexible settings to connect and gather real-time process data from pretty much any Modbus Ethernet capable device for HMI, SCADA, MES and other client applications.

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Demystifying Modbus Function Codes

12 min read

By Kevin Rutherford on Dec 13, 2018 2:00:00 PM

With the wide range of devices that use Modbus for their communication protocol, you'll find many different interpretations, terminology and labels with respect to how to access different types of data in those devices.  Sometimes a device manual might only refer to the supported Modbus function codes and the range of offsets available for those function codes.

In this blog post, I will step through the specifics of Modbus function codes and how they pertain to addressing, and how they affect what addresses to use in TOP Server for Wonderware applications.

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Demystifying Modbus Register Addressing with TOP Server for AVEVA

7 min read

By Kevin Rutherford on Oct 11, 2018 2:00:00 PM

I'm sure you've all at least had some interaction with Modbus, working in the automation industry.  It's one of the most widely used protocols (if not the most widely used) in the world.  Which is both its blessing and its curse, to some extent.

Given how long Modbus has been around and in use as an "open" protocol (starting in 1979), there have been many different interpretations of Modbus throughout the years.  And with those different Modbus interpretations, much confusion about the different terminology for accessing data.

In this blog post, I will step through the basics of Modbus addressing including how offsets come into play, and how they affect what addresses to use in TOP Server for AVEVA applications.

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