professional software made in Germany

PLCcom für Modbus FAQ – Häufig gestellte Fragen2022-02-24T15:29:26+01:00
Which system components are required for the operation of PLCcom for Modbus?2022-09-08T10:14:39+02:00

The following system components are required for the operation of PLCcom:

  • Microsoft .NET Framework 4.7.2 (.Net Version) or higher
  • Microsoft .NET Core 3.1 (.Net Version) or higher
  • Microsoft .NET Standard 2.1 (.Net Version) or higher
  • Microsoft .NET 5.0 (.Net Version) or higher
  • Java SDK (openJDK) 1.8 / JRE (openJRE) 8 or newer (Java-Version)

To execute code examples:

  • Visual Studio 2019 or higher (.Net-Version)
  • Netbeans 8 or higher (Java)
  • Eclipse Oxigen or newer (Java)
Which files do I need to reference in my software?2022-09-08T10:14:39+02:00

To use the .NET-component you have to refer to the PLCcomMB.dll.

To use the Java-component you have to refer to the PLCComModBus.jar and jssc.jar.
Best practice: copy the files to your java home dictionary [jdk HOME]/jre/lib/ext or [jre HOME]/lib/ext.

Does PLCcom for Modbus also runs in 32-Bit- and 64-Bit-environments?2022-09-08T10:14:39+02:00

Yes, PLCcom runs in 32-Bit- and 64-Bit-environments.

Are OS-API calls necessary to operate PLCcom for Modbus?2022-09-08T10:14:39+02:00
The libraries are, depending on the version, to 100% Java or .NET code.
You can embed the driver directly as a link; API calls are not necessary.
It is no problem to use the component in 32- or 64-Bit-environments, as well as across platforms.
Where can I find programming examples and the documentation?2022-09-08T10:14:39+02:00

In the download package, extensive programming example objects, as well as a HTML documentation are included.

Download current version of documentation:



What should be considered when using PLCcom in a network?2022-09-08T10:14:39+02:00

The network participants must be able to connect with the network. The Connection and ports must not be interrupted by a firewall or similar.

How can I understand the basic principle of the PLCcom license model?2022-09-08T10:14:39+02:00
The license model of PLCcom is kept as simple as possible.
All licenses are made available as developer licenses.
The fee-based professional license entitles a developer for industrial/commercial development of individual software (definition see EULA) with the PLCcom component.
Can I use PLCcom non-commercial free of charge for teaching purposes at a school/university?2022-09-08T10:14:39+02:00

If you need a free license for non-commercial usage for schools or universities please contact us via e-mail You'll receive a serial key as soon as possible.

How can I get the licenses?2022-09-08T10:14:39+02:00

To get the licenses you have the following possibilities:

  • on our website
  • by sending an email to
  • by phone at +49 421 989703-30
  • by fax to +49 421 989703-39
How is the license within the PLCcom Runtime to install?2022-09-08T10:14:39+02:00

You must transfer the submitted license key within your software to the PLCcom entity.

Extensive examples can be found in the online documentation or the delivered software package.

In our company the number of employees who work on a project keeps changing. Therefore, the number of licenses required changes. Is there a possibility for a flat-rate licensing?2022-09-08T10:14:17+02:00

Please contact us in this case. We will then create an offer for a company license.

Is the passing of the license to my clients possible?2022-09-08T10:14:17+02:00

No, if your customer wants to make a further development of your software, the customer needs an own license.

What type of PLC and devices can I connect with PLCcom?2022-09-08T10:14:17+02:00

PLCcom is compatible with all Modbus devices that support the specification of Modbus Organization.

What happens to my data after registration?2022-09-08T10:14:17+02:00
The data entered by you will be kept confidential in accordance with the Federal Data Protection Act.
A processing of the data occur only for internal purposes, such as the management of licenses, newsletter etc. A disclosure to third parties is excluded.
What are multiple listeners?2022-09-08T10:14:17+02:00

Slave-component whit multiple listeners; that means it is possible to make any numbers of accesses to a Modbus Slave available at the same time e.g. TCP Port 502, TCP Port 503, UDP Port 502, etc.


Nach oben