×
Siemens Industry Online Support
Siemens AG
文档类型 应用与工具 文档编号 75867147, 文档发布日期 2018年12月19日
(23)
评估

Modbus/TCP - Standardized and redundant Communication of PCS 7 with Third-Party Systems

  • 文档
  • 涉及产品
You can integrate controllers and systems of numerous manufactures with Modbus/TCP in PCS 7. Siemens provides an application example, in which a redundant Modbus/TCP connection is described completely.

Task
Modbus is an open communication protocol that is used worldwide and supported by numerous manufacturers.
The requirement to connect third-party systems to SIMATIC PCS 7 via Modbus arises in particular when

  • legacy systems are expanded or modernized
  • controllers and systems from different manufacturers are connected – also when constructing new plants.

Modbus is based on a master/server or client/slave architecture that can be implemented in various ways within PCS 7.
On the one hand, the choice depends on the Modbus protocols (TCP or PtP) supported by the existing systems and controllers intended to communicate with one another.
On the other hand, the type of connection, i.e. which communication partner is the client and which one is the server, results from the plant network.

Solution
We introduce you to a Modbus/TCP library – available in different versions – that allows you to connect third-party systems to PCS 7 via Modbus/TCP.
A general description is followed by a configuration example that completely describes the Modbus/TCP client solutions for redundant connection of third-party systems to PCS 7 via Industrial Ethernet.
The example uses the "Modbus/TCP CP Red V4" Modbus/TCP library.

Video: Overview of the application


Customer benefits
This configuration example enables you to significantly reduce your engineering overhead using PCS 7 standard means and increase performance. You can use this solution for both new configurations and integration into existing projects.
All the necessary hardware and software products are from Siemens and ensure the usual compatibility, up-to-dateness and upgrade options. The solution considers both the PCS 7 standard and the Modbus standard without exception.
In addition, using the Modbus library provides you with the following advantages:

  • Easy connection of systems from different manufacturers to PCS 7 via Industrial Ethernet
  • Step-by-step, cost-effective expansion or modernization of legacy systems over their entire life cycle
  • Reliable support from Siemens
  • No specific Modbus know-how needed
  • Engineering in the familiar PCS 7 environment
  • Block library with online help in German and English
  • Setup in German and English

Main contents of the application description

  • Required hardware and software
  • Installation and setup
  • Configuration
  • Performance data
  • Add-on blocks: (send, receive, job management and diagnose)
  • PCS 7 message library

Validity
All Modbus blocks described and used in this application description are released for PCS 7 V9.x, V8.x and V7.1.

Documentation
 Modbus/TCP Communication of PCS 7 with external systems 

Add-on blocks and PCS 7 message texts
Add-on blocks for Modbus/TCP communication

Further information
Modbus PtP - Redundant connection of third-party systems to PCS 7

Last revision
Update to PCS 7 V9.0

  • Interface changes of the Modbus/TCP blocks
  • New licensing model

Additional keywords
OpenModbus/TCP

安全性信息
为了保护技术基础设施、系统、机器和网络免受网络威胁,有必要实施并持续维护一个全面、最先进的IT安全方案。西门子的产品和解决方案构成了这一方案的一个要素。有关网络安全的更多信息,请访问
https://www.siemens.com/cybersecurity#Ouraspiration.