Configuring Communication Connections

4.7.5Free UDP Connection

Program-Controlled Addressing

A free UDP connection allows program-controlled addressing of the communication partner. Communication between two nodes on Industrial Ethernet has the following properties:

SData transfer is bi-directional; in other words it is possible to send and receive on the UDP connection at the same time.

SThe local node is specified in the configuration. The remote node is entered in the job header of the job buffer by the user program when it calls AG_SEND. This allows any node on Ethernet/LAN/WAN to be reached.

SThe IP address and the port of the sender can be read from the job header of AG_RECV.

SIMATIC S7 station with Ethernet CP

User data area

Ethernet node (unspecified)

 

 

Job buffer

 

send

 

 

 

 

 

 

 

 

 

Job header

 

 

receive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

User data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

unspecified UDP connection

receive

send

Figure 4-28 Sending and Receiving on an Unspecified UDP Connection with Programmed Addressing

Amounts of Data

Refer to the manual /1/ supplied with the Ethernet CP for the number of UDP connections supported by the Ethernet CP. The number of connections per station can be increased by adding more CPs.

Up to 2042 bytes of user data can be transferred per job buffer. The job header uses an additional 6 bytes.

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Siemens S7 appendix Free UDP Connection, Program-Controlled Addressing

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.