Glossary

Subnet

A subnet is part of a –> network whose parameters (for example –> PROFIBUS) must be matched. The subnet includes bus components and all the attached stations. Subnets can, for example, be connected together by –> gateways to form a network.

A –> system consists of several subnets with unique –> subnet numbers. A subnet consists of several –> stations with unique –> PROFIBUS or MAC addresses (Industrial Ethernet).

System

This means all the electrical equipment within a system. A system includes, among other things, programmable logic controllers, devices for operation and monitoring, bus systems, field devices, actuators, supply lines.

Transmission rate

According to DIN 44302, this is the number of binary decisions transmitted per time unit. The unit is bps. he set or selected transmission rate depends on va- rious conditions, for example the distance across the network.

Transport layer

The transport layer is layer 4 of the ISO/OSI reference model for open system interconnection. The purpose of the transport layer is to transfer data reliably from device to device. Transport connections can be used for the transmission.

Transport interface

The transport interface of a SIMATIC S5 PLC is the access to the connection- oriented services of the transport layer on the CP. The transport interface pre- sents itself to the control program in the form of handling blocks (HDBs).

TSAP

Transport Service Access Point

Watchdog

Mechanism for monitoring operability.

SIMATIC NET NCM S7 for Industrial Ethernet

205

C79000-G8976-C129–06

Page 205
Image 205
Siemens S7 appendix Subnet, System, Transmission rate, Transport layer, Transport interface, Watchdog

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.