Programming FCs (Functions) and FBs for S7 Ethernet CPs

Working with the Job Header

Free UDP connections require a job header in the user data area.

The following schematic illustrates the structure of the job buffer and the meaning and location of the parameters in the job header.

User data area

 

 

 

 

 

 

Port

 

 

EBH (low byte)

03H (high byte)

Bytes 0,1

 

 

Job buffer

 

 

 

 

 

 

 

IP address

8EH

0BH

Bytes 2,3

 

 

Job header

 

 

 

 

 

 

28H

23H

 

 

 

 

 

 

 

 

Bytes 4,5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

User data

 

 

 

 

 

Data byte 0

Data byte 1

Bytes 6,7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bytes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Data byte 2040

Data byte 2041

2046,2047

Figure 5-1

Sending and Receiving on a Free UDP Connection with Programmed Addresses

SIn the picture (entries in hexadecimal) the following IP address is assumed: 142.11.40.35 (example only);

SFor the port address 1003, the following would be entered: for low byte: EBH;

for high byte: 03H.

SThe user data area can be up to 2048 bytes long. Up to 2042 bytes of user data can be transferred. 6 bytes are reserved for the job header.

Please note that the data length specified in the block call (LEN parameter) must include the header and the user data!

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Siemens S7 appendix Working with the Job Header, 8EH 0BH

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.