Communication via Ethernet CPs in S7 Stations

1.4S7 Communication on Industrial Ethernet

Application

S7 communication via Industrial Ethernet allows program-controlled communication using communication SFBs/FBs via configured S7 connections. Per job, up to 64 Kbytes of user data can be transmitted.

The Ethernet CP acts as an “S7 communication relay” by passing on the S7 functions via Industrial Ethernet (see /8/). Depending on the configuration of the Ethernet CP, data transfer is on the basis of the ISO transport or the ISO-on-TCP protocol (TCP/IP with RFC 1006).

From the perspective of the user, S7 communication is identical over PROFIBUS and Industrial Ethernet.

Nodes

Two cases can be distinguished depending on device type and plant configuration:

SClient and server functionality at both ends

S7 connections can be operated between the following nodes with the entire functionality of S7 communication:

between S7 stations S7-300 and S7-400;

between S7 stations and PC/PG stations with an Ethernet CP.

S7 – 400

Ethernet CP

S7 – 300

Ethernet CP

 

 

M7

Ethernet

 

PUT / GET

 

BSEND / BRECV

WAN *

USEND / URECV

 

* only TCP/IP

 

PC/PG with Ethernet CP

 

S7 – 300 / 400

 

Figure 1-3 Nodes Communicating on S7 Connections over Industrial Ethernet

 

SIMATIC NET NCM S7 for Industrial Ethernet

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Siemens appendix S7 Communication on Industrial Ethernet, Nodes, Client and server functionality at both ends

S7 specifications

The Siemens S7 series represents a cornerstone in the realm of programmable logic controllers (PLCs), developed by Siemens, a leading company in industrial automation. Widely used across various industries, the S7 series offers robust solutions for controlling machinery and processes, thanks to its reliable performance, flexibility, and scalable architecture.

One of the key features of Siemens S7 PLCs is the modularity of their design. Each system can be configured to meet specific application requirements due to the ability to mix various input/output modules, CPUs, and communication processors. This modular approach allows for the customization of systems to suit diverse automation tasks, providing end users with the adaptability required for modern manufacturing environments.

The S7 series encompasses several models, including the S7-1200, S7-300, and S7-1500. The S7-1200 is particularly suited for small to medium-sized applications, offering a compact design and integrated communication interfaces. In contrast, the S7-300 is designed for more extensive and complex control systems, making it ideal for large-scale industrial applications. The S7-1500 stands out with its advanced performance metrics, rich feature set, and high-speed processing capabilities, making it perfect for demanding applications that require real-time control and extensive data handling.

Siemens also emphasizes the importance of communication technologies within the S7 series. With options such as PROFINET, PROFIBUS, and EtherNet/IP, the S7 PLCs can seamlessly integrate into existing automation infrastructures, ensuring smooth data exchange between devices. The incorporation of web-based technologies and cloud connectivity further enables remote monitoring and control of systems, enhancing operational efficiency.

Another notable characteristic of Siemens S7 PLCs is the use of TIA Portal (Totally Integrated Automation Portal), an innovative software platform that simplifies the engineering process. TIA Portal allows users to program, configure, and diagnose their automation devices in a single environment, reducing setup times and improving productivity.

In conclusion, the Siemens S7 series stands out due to its modular design, range of models suitable for various applications, advanced communication technologies, and user-friendly programming software. This combination of features and characteristics makes S7 PLCs a preferred choice for industries seeking reliable and efficient automation solutions. As industrial demands continue to evolve, Siemens S7 PLCs remain at the forefront, adapting to technological advancements and setting benchmarks in the automation field.