Communication via Ethernet CPs in S7 Stations

Notes on S7 communication between PC/PG station and S7 station

Applications in a PC/PG station communicate with the S7 station over an OPC interface or SAPI-S7 interface for operator intervention, monitoring and control.

The S7 stations use the integrated communication SFBs/FBs (client and server functionality at both ends).

The following general requirements must be met by a PC/PG station for S7 communication:

SOn the PC/PG:

an Ethernet CP installed

there is an interface for S7 communication installed: SOFTNET S7 for Ind. Ethernet or S7-1613/ WIN 95, WIN NT, MS-DOS, Windows.

SThe CPs in the S7 stations are supplied with a MAC/IP address (use the default MAC address or set an IP address).

To use S7 communication with the SIMATIC S7 PLC from a PC, address the required CPU module in the SIMATIC S7 PLC that you want to communicate with in your PC application.

S7 communication via routers (one-ended client and server functionality)

It is possible to reach the S7 station from an application (OPC server) of the PC/PG station that is attached to another subnet. The subnets must be connected over a router such as the IE/PB Link. An S7 station or a PC connected to both subnets can also serve as a router.

In this configuration, the S7 station can only be addressed by the PC/PG station as a communications server on S7 connections configured at one end.

The requirements for the configuration of the PC/PG station are identical to those for operation in the same subnet (see above); the CP in the PC/PG station must also have routing capability.

In this situation, configure a one-endedS7 connection to the PC/PG station in the other subnet for the PC/PG station in STEP 7 NetPro. You can then access data in the S7 station in your user program using the functions PUT (writing) and GET (reading).

26

SIMATIC NET NCM S7 for Industrial Ethernet

C79000-G8976-C129–06

Page 26
Image 26
Siemens appendix Communication via Ethernet CPs in S7 Stations

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.