OPC Unified Architecture.

How to use OPC-UA with a Windows client

How to use OPC-UA with a Windows client

In this article we will show you how OPC-UA works and how you can use it easily.

OPC Unified Architecture.

OPC-UA is meanwhile the internationally established industry standard for data exchange. This allows data from machines to be transferred and made usable.

What is OPC-UA?

As industry grows and becomes more digital, more and more data must be exchanged between machines and plants. Hardware and software must therefore work more closely together in order to be able to directly monitor industrial plants.


OPC-UA is an industrial protocol, the name stands for Open Platform Communications. The first version appeared in the fall of 2006 and has been constantly updated and expanded since then. The UA stands for Unified Architecture, which is the latest specification of OPC.

Exemplary structure of an OPC UA system

When networking machines and industrial plants, problems can always occur, for example due to different and incompatible interfaces of the machines. Many manufacturers and software providers use their own, so-called “proprietary” protocols. The result: no or only limited compatibility, security risks and high follow-up costs.

OPC-UA finally puts an end to this. Thanks to the industry standard, it is possible to use machine data consistently, securely and without disruptions. It is therefore a standard for communication among machines, but also between machines and PCs or servers. The industry standard connects production with the IT world. Databases, ERP systems and other IT systems can finally be connected securely and easily.

Who uses OPC-UA?

Since the architecture is now the data standard in the industry, it is naturally also used by well-known companies and integrated into products, machines and systems.

Siemens, Honeywell, Microsoft, Beckhoff, SAP, Yokogawa, ABB, Rockwell, Schneider Electric, Wago, Iconics.

Why OPC-UA?

The industrial protocol has thus established itself on a broad front: many well-known companies use the data standard. But what is so good about it?

It is the industrial protocol of the future, since the infrastructure is maximally expandable and modifiable. Both OPC-UA data sources (e.g. industrial machines) and OPC-UA client applications can be exchanged flexibly. If required, even the server can be exchanged.

IT security is part of the industry standard. Your data is encrypted and your sessions are secured. In addition, the German Federal Office for Information Security (BSI) has conducted a security analysis and concluded that the data standard is very secure, while it allows targeted and controlled distribution of data.

OPC UA standardizes access to machines, devices and other systems. It is manufacturer and platform independent and therefore enables a similar exchange between machines, devices and other systems in the industrial environment. This means that older technologies can also be connected to newer ones without any problems, even if they come from different manufacturers. This results in high flexibility and compatibility.

As you can see, the communication protocol offers useful features to make better and safer use of machine data. But what data is actually in the control system of a machine? Typically, this valuable data can be found in machines and plants:

Note: OPC-UA is not the only way to use machine data. In the article “PLC-PC data exchange: Without OPC server?” we have compared the industry standard with an alternative.

What are the advantages of OPC-UA?

What advantages does the communication protocol offer? Is it worth purchasing or converting? In many cases, it does. Let it be the IT security in production, which is increased, or also the future viability by avoiding vendor lock-in effects. The Siemens S7 world also benefits, since optimized data blocks are now easily and securely accessible.

More data security in production

Data security with OPC-UA

The communication protocol can be operated both encrypted and secured, as well as unencrypted. In order to comply with today's usual security standards, you should only connect your machines and systems in encrypted form.

Avoid vendor lock-in effects

What is a vendor lock-in?

With vendor lock-in, a customer cannot easily use equivalent solutions for products or services. This is usually because products from different companies are incompatible.

Use optimized data blocks

Reading and writing optimized data blocks

Simply use optimized Siemens S7 data blocks or connect controllers from other manufacturers.

What do I need to be able to use OPC-UA?

The basic requirement for use is a network based on the Internet Protocol (IP). This is the case with the usual Ethernet technology and thus also Profinet. In addition, of course, you need a machine or plant with a programmable logic controller (PLC).

All modern Siemens S7 controllers support the architecture, but which controllers can you use? We recommend a Siemens S7-1500, alternatively you can use a S7-1200 (with limitations) or an ET 200. More about this further down in the article.

The communication is based on the client – server principle. With an installed OPC client a connection to an OPC server can be established. In this example we use the DataSuite software on a PC as OPC-UA client. The PLC acts as OPC-UA server.

What is needed:

As you can see, you don’t need much to use the communication protocol. As a client, we use the DataSuite software. You can find a free 30-day trial version here: DataSuite trial


In the next step, you will learn how to configure in TIA Portal.

Configuration in TIA-Portal

To use the communication protocol with a Siemens S7 you have to configure it first. But this is very simple. Here you get it explained step by step.

For the communication, the PLC acts as OPC-UA server. You must first activate this in your controller. To be able to read and write variables with a client, you must first set up a server interface in the TIA Portal.

To activate the server of the PLC, a runtime license from Siemens is required. The exact license depends on your PLC. The upper field shows the required license, while you select the respective license in the lower field.

OPC-UA-Runtime-Lizenz von Siemens auswählen
Selection of the license in TIA Portal

The communication with controllers of the type S7-1200 is different to the S7-1500 controllers. To be able to use variables, you must create corresponding server interfaces in the S7-1200 beforehand.

S7 1200 SPS
Siemens S7-1200

Limited functionality with S7-1200 controllers

The OPC UA server of an S7-1200 offers significantly fewer functions than of an S7-1500. These limitations bring disadvantages in the application, but the communication still works without problems.

To establish an OPC-UA connection to your PLC, you have to configure some settings in the PLC.

To do this, open the settings of the PLC and select the OPC UA option. There you can activate the OPC-UA server and the standard SIMATIC server interface. Below that you can change the port of the connection (default: 4840).

Activate OPC-UA in TIA Portal

In the menu item Security you will find the endpoints offered by the PLC. These differ in the respective security settings. Deactivate the endpoints that are not required here. We recommend that you use a signed and encrypted connection.

Selection of security settings

Now your PLC should be ready for use as OPC server. In the next step we will explain how to configure the OPC-UA Client (DataSuite).

You would like to get a live insight into DataSuite 3?

In a live online demonstration, we will go into detail about the individual functions and answer any questions you may have. Together we will find out whether DataSuite 3 is suitable for your needs.

Configuration of DataSuite as OPC-UA Client

Now you need a PC or a virtual machine with DataSuite software installed. If you have activated the OPC-UA Server as described above, you can establish an OPC-UA connection to your S7 PLC using DataSuite.

To create a new PLC connection in the software, select the “Controllers” item in the menu on the left. There you will find the [MB] simulator for testing, but in our case we want to set up a real PLC connection. Therefore please select “Create new PLC” and then choose the connection type “OPC-UA”.

After that you automatically reach the configuration of the OPC-UA connection. There you can select different security profiles and set a user name with password, which you have defined before in TIA.

edit plc opc-ua connection
Setting the OPC UA connection

Now test the connection with the button provided for this purpose and then save. Now you can import variables and use them as you wish throughout the program.

OPC-UA-Variablen auswählen
Select OPC-UA variables

But what to do with the data or variables? In this example, we save them in an Excel file as a log. Please read our article “It works that easy: Writing Excel files with the Siemens S7” how you can easily use this OPC data for Excel files.

The result could look like this: A temperature curve in Excel via OPC-UA from a Siemens S7 PLC:

temperature trend excel
Exemplary representation of OPC-UA machine data in Excel

Much more information and setting options can be found in the DataSuite software manual, which is included in the download. There you can find detailed instructions with screenshots.

Further information and assistance free of charge from our support team:

Phone: +49 2742 72927 83
E-Mail: [email protected]

Conclusion

Modern Siemens S7 controllers come with an integrated OPC-UA server. With the [MB] DataSuite software as OPC-UA client for Windows,  you can connect your machines and plants via OPC-UA, evaluate and use data. Client and server form the basis for a future-proof, secure and reliable networking of your production.

Download trial software

Test all functions free of charge for 30 days. You will receive a mail with download link for instant use.

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S7 1200 SPS

Scan for S7 controllers in your network

Scan for S7 controllers in your network

You may know the problem: You simply do not know the IP address of your Siemens S7 anymore. We can now provide a remedy for this issue. We will show you an easy S7 network scan.

S7 1200 SPS

Simply scan for all available Simatic S7 PLCs in your local network. A scan via a VPN is also possible. With the free PLC scanner software, you can see every connected S7 PLC in seconds, incl. IP address and further info.

Setup

What you need for scanning

The setup is quite simple. You need:

PC with Windows 10 or 11
Connection from this PC to the control network
Scan software

Setup S7 network scan

Of course, one or more S7 PLCs are also required. This can be any model of the Siemens S7 series. It is important that the PLC CPU has a Profinet connection, alternatively a CP, e.g. a CP 343-1 lean is suitable.

How to do it

Perform scan

The actual scan is done via Ethernet, so RPC 1006, sometimes called S7 direct. We assume Siemens S7 controllers in this article. This tutorial works for S7 300, S7 400, S7 1200, S7 1500 and similar products from Siemens or Vipa.

With our network scan software, the “PLC Scanner”, you can now scan for controllers in the network. To do this, simply select the menu item “Network” in the left navigation.

Network scan of S7 controllers

You have the choice whether you simply want to scan automatically in the connected network, or whether you want to perform a manual scan in a network that is hidden, perhaps behind a router.

Especially for larger networks, or if you scan over a VPN, you should specify the network manually. Under such circumstances, routing must also be taken into account.

Single S7 scan

Read out details

If the result list of the network scan does not provide you with enough details, then you can also read out an individual PLC completely. To do this, select the “Scan” menu item in the navigation.

Measurements can be easily performed with the free PLC Scanner software

The following data is displayed:

scan yourself

Download for free

If you want to scan your network for S7 controllers yourself, just fill out this form and we will send you the download link to the software by mail.

Conclusion

With the PLC-Scanner software, you can easily and quickly find S7 CPUs in your network. Details of the individual CPUs can also be read out. The setup is simple and the software is free of charge.

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PLC PC Data Exchange: Without OPC Server?

PLC PC Data Exchange: Without OPC Server?

When it comes to the data exchange between the PC world and the automation world, there is no way around an OPC server, right? The remaining question is: Use OPC UA, or not? What are the alternatives? Learn more in this article.

Faster data exchange without OPC UA

Especially relevant for S7 1200 CPUs

Some advantages of a direct ProfiNet (RFC1006) connection are obvious:

Not quite as obvious, however, is the speed advantage of a direct connection without OPC UA, especially compared to the now outdated OPC DA. We have performed a series of measurements with an S7 1212 CPU and determined how fast a direct data connection from a PC to the S7 can be:

Speed measurement with an S7 1212C

The diagram shows how fast it can be. We measured the speed with a S7-1200 CPU with data sets of different sizes. The data records are read from a data block and written to an Excel file. The times here are well below 200ms per data set. It should be noted that a large part of the time is required for writing to the Excel file. Pure data transfer via Ethernet is much faster.

How fast is the data transfer in your S7 project?

It depends on these factors

The transmission time or the speed depends on many factors: PLC CPU, program workload, network, PC speed, etc. With a fast S7-1500 CPU and almost ideal conditions we could realize transfer times in the range of 1 ms. The S7-1200 used here for the measurement is of course slower. There the pure transmission times are about 10 to 12 ms.

You notice: It is not trivial to answer this question. We will be happy to advise you free of charge and without obligation and answer specific questions about your project and your plans.

We answer your questions

In a free video call with our experts on this topic, you can ask questions about your application and get useful background knowledge.

This is how it works:

  1. Click on “Start appointment booking
  2. Select content and date/time
  3. Book appointment

The appointment booking is done with Microsoft Bookings, Microsoft’s privacy policy applies.

Profinet and OPC UA in comparison

Comparing a direct S7 connection (RFC 1006) and OPC UA

A lot has happened in the meantime with the new OPC UA standard. Many problems of the old OPC DA have been solved. So it is still a small effort to install an OPC UA server on a Siemens S7 PLC, but it is much easier than in former OPC DA days.

A big advantage of OPC UA compared to a direct S7 connection is the security. With OPC UA you can easily establish encrypted data connections to Siemens S7 PLCs. This can be done by user name and password, and also with a certificate.

S7 direkt

vs

OPC UA

One solution for Profinet and OPC UA

No matter whether you decide for a direct S7 connection (Profinet) or for OPC UA: With our DataSuite software you are well positioned. After you have connected the PLC to the PC, you will hardly notice the difference between OPC UA and a direct S7 connection via RPC 1006.

OPC UA connection settings in the DataSuite software

PC connection via OPC has never been easier. The DataSuite software acts as OPC UA client for Windows and provides you with OPC data from the connected S7 controllers as documents. These can be PDFs, Excel files or HTML files. Alternatively, an export and import with SQL databases is possible.

Conclusion

The days of OPC DA are over. If you want to focus on security and future viability in machine connectivity today, there is no getting around OPC UA. Alternatively, there is the possibility to save costs with an S7 direct connection to still ensure a good data exchange.

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It works that easy: Write Excel files with the Siemens S7

It works that easy: Write Excel files with the Siemens S7

Unfortunately, it is not possible to write real Excel files with a Siemens S7. In this article, we will show you how you can still achieve your goal and create first-class xlsx-documents with your PLC.

It's that easy:

Create real Excel files with a S7 PLC

In this context, Siemens likes to refer to the possibility of creating “Excel-compatible” files with the help of WinCC. What is meant here are CSV files. These are a relic of the last century. They do not offer much more than a line-based storage of values. It is possible to import them into Excel, but something else is nice.

But nowadays, customers expect a proper layout in the form of a real Excel file (xlsx). Sometimes they even make concrete specifications regarding logo, colors, or fonts.

But don’t worry, we have found a good solution for this task.

Forget about csv

Only real Excel files can do that

Formulas or charts are often used. Thus, it is easy to design an Excel template with a measured value representation in the form of line or bar charts. In addition, Excel offers a whole range of other features that are only possible with real Excel files.

The result could for example look like this:

Excel file with chart created from machine data

Advantages of Excel files over CSV files

How to create Excel files with the S7

With our software DataSuite 3 (formerly SPSDataReader), you can easily create these and other Excel files with your Siemens S7 PLC. The program reads data blocks (DB) from your S7 and creates real Excel files from them. Your controller can read and write an unlimited number of different Excel files. In the same way, several controllers can also write to one file.

You don’t need WinCC, no installed Excel program, no OPC server. Just install DataSuite on a PC with Ethernet connection, configure, done. This is how easy it is to write Excel data with an S7 controller. You can find a free 30-day trial version here: DataSuite trial

Configuration in DataSuite

It is actually as simple as it sounds. After installing DataSuite, you can create an Excel file and configure it. DataSuite can read and write Excel files, but here we will focus on the writing process.

First, you need to create an Excel file where the values should be written. To do this, click on the “Excel files” menu option. Then click on “Create new file”, the number of possible files is unlimited. Now you can create an xlsx-file, which you can configure on this page:

edit xlsx file in DataSuite
Edit xlsx file in DataSuite

Once you have successfully created and configured the file, you can create a trigger. A trigger triggers under certain conditions and then executes a desired action.

Since we want to write an Excel file with the Siemens S7, click on “Trigger” on the left and edit the trigger “Write data record”.

write data record in DataSuite
Trigger configuration in DataSuite software: Assigning Excel cells to S7 variables

Now you can freely configure the trigger and assign Excel cells to S7 variables. Of course, you can also add more actions in the trigger. We have already prepared the most important machine applications with Excel files for you. Choose your application from different templates:

templates writing excel files
Selection of an Excel template in the DataSuite software

Much more information and setting options can be found in the DataSuite software manual, which is included in the download. There you can find detailed instructions with screenshots.

Further information and assistance free of charge from our support team:

Phone: +49 2742 72927 83
E-Mail: [email protected]

Conclusion

Creating first-class Excel files with a Siemens S7 PLC is no longer witchcraft nowadays. With the right software, even beginners can automatically generate Excel reports of machines and plants.

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Siemens S7 Speed Test

Siemens S7 Speed Test

Frequently S7 programmers ask the question “How can I determine the transfer speed between PLC and PC?” We will show you how to perform an S7 Speed Test.

Example: If a machine produces a part every 200 milliseconds, then the transfer of the associated data should take less than 200 milliseconds. Otherwise, there will be overlaps in the data transfer and consequently data loss.

Read in this article how you can detect such problems before it becomes critical.

So that production runs safely

Measuring instead of guessing

A general answer to the question of how fast my Siemens S7 PLC can deliver data is unfortunately not possible, because the speed depends on several factors. Among other things, the speed of the PC, the used S7 PLC and the network play an important role.

Therefore, the easiest way to find out the speed is a measurement.

How to do it

Measurement setup

First of all, a PLC is required. This can be any model of the Siemens S7 series. It is important that the PLC CPU has a Profinet connection, alternatively a CP, e.g. a CP 343-1 lean is suitable. The measurement is done via Ethernet, i.e. RPC 1006, sometimes also called S7 direct.

The simple measurement setup for the speed test

In order to retrieve data for the speed test, the Put/-Get communication must also be activated in the S7 PLC. With older PLCs, series S7 300 and S7 400, this is automatically the case. With newer Siemens PLCs, e.g. S7 1200 and S7 1500, you have to activate this in your project engineering.

In addition to a Siemens S7 PLC, a PC is also required to perform the S7 speed test.

Free measurement software for S7

Measurement software and settings

After the hardware is ready, you still need a measurement software. With our free PLC scanner, you can not only scan your network for Siemens controllers, you can also perform a speed test.

More info about the scanner software in this article: Network scanner for Siemens S7 controllers

Measurements can be easily performed with the free PLC Scanner software

The configuration and use of the scanner software is, as with all products from [MB], simple and intuitive. You only have to establish a connection to the PLC and then the speed test can start.

Measure yourself

Download for free

If you also want to measure your controllers and network yourself, just fill out this form and we will send you the download link to the software by mail.

Conclusion

With the PLC-Scanner software, you can easily and effectively measure the speed between a Siemens S7 PLC and a PC. The measurement setup is simple, and the software is free of charge.

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A secure database connection

DataSuite News EN 1/22

[MB] DataSuite news 01/22: IT security in manufacturing

New DataSuite 3 News

We hope you had a few peaceful days and “slipped” well and safely into the new year. Unfortunately, not everyone felt that way. In many companies there was extra work and sometimes very big problems due to the recently discovered security leaks.

How you can avoid such problems and why you are always on the safe side with our DataSuite software, you will find out in this newsletter.

Log4j and DataSuite?

What our developers say

You have probably already read it: The widely used log component Log4j has a security-critical bug that is already being used extensively by many criminals. The IT world is in an uproar because many software manufacturers have integrated this component into their products. We have already been approached by some customers who have affected products in use.

 

The mastermind behind the DataSuite software, our Senior Software Developer Florian Baldus comments: “We do not use the Log4j library. The DataSuite is not based on Java programming, but on C#. We secure the development with numerous automated and manual tests. Even though human errors, and thus new security vulnerabilities, always remain possible: We have done everything to exclude them as far as possible.” More about the people behind DataSuite

Log4j

Secured data connection to PLCs

The BSI recommends OPC-UA: Are you using it yet?

Connections to a Siemens S7 PLC* can be encrypted using OPC-UA. The German Federal Office for Information Security (BSI) has examined OPC-UA in detail and recommends its use. With our DataSuite, using OPC-UA is a piece of cake.

More about OPC-UA

 

* All “new” series, such as S7 1500

Simply use encrypted connections with the S7

Encrypted SQL databases

A secure connection of machines and plants via OPC-UA is an important first step. After that, the question arises as to how securely the machine data is stored. Databases are usually used for this purpose. With our DataSuite software, you can configure encrypted connections to SQL databases simply with a click of the mouse. More about SQL databases.

Get free consulting now

Your questions will be answered in a video call or a telephone conversation with one of our experts. Concrete requirements and projects can be discussed directly.

The appointment booking is done with Microsoft Bookings, Microsoft’s privacy policy applies

MB Software Data Suite 3 Beratungsgespräch
Because IT security is only half the battle

Handshake and hearbeat

As a companion to encrypted connections, you can monitor every data operation with the integrated handshake and heartbeat mechanism of the DataSuite. If a storage attempt fails, e.g. because a network cable has been interrupted, the PLC is informed immediately. Also possible: The DataSuite sends an email or SMS in the event of a connection interruption. More about handshake

New versions and updates

Updates are free of charge with us.

Version log DataSuite 3 software

Download trial software

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