Communication via Ethernet CPs in S7 Stations

1.6FETCH/WRITE Services (Server)

Application

In addition to the SEND/RECEIVE interface, the FETCH/WRITE functionality provides further services for S5-compatible communication on configured transport connections.

The FETCH/WRITE interface is used primarily to attach SIMATIC S7 to SIMATIC S5 and to other non-S7 stations (for example PCs).

SFETCH

The partner on the connection (SIMATIC S5 or non-S7 station) can read system data on the SIMATIC S7 PLC.

SWRITE

The partner on the connection (SIMATIC S5 or non-S7 station) can write system data on the SIMATIC S7 PLC.

From the point of view of the SIMATIC S7 PLC, this is a passive communication function; the communications partner initiates the connection establishment.

For further information, refer to the system documentation of the SIMATIC S5 PLC or the non-S7 station you are using.

Connection Types

To access a station with FETCH or WRITE functions, a FETCH passive or WRITE passive connection must be configured. The following types are possible:

SISO Transport

SISO-on-TCP

STCP

Coordinating Access Using the User Program

To coordinate access, you can use the FCs AG_LOCK and AG_UNLOCK.

With these FCs, you can coordinate access to system memory areas so that no inconsistent data are created and transferred.

SIMATIC S5

On the SIMATIC S5 station, the FETCH/WRITE services are configured and started by READ ACTIVE/PASSIVE and WRITE ACTIVE/PASSIVE.

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SIMATIC NET NCM S7 for Industrial Ethernet

Release 6/2003

C79000–G8976–C129–07

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Siemens NCM S7 appendix FETCH/WRITE Services Server, Connection Types, Coordinating Access Using the User Program
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NCM S7 specifications

Siemens NCM S7, which stands for Siemens Network Control Module for the S7 series, represents a significant advancement in industrial automation technology. This robust control system is designed to enhance productivity and efficiency in various manufacturing processes. Its primary purpose is to facilitate seamless communication between field devices and higher-level control systems, ensuring that processes run smoothly and effectively.

One of the main features of the Siemens NCM S7 is its exceptional connectivity. The module is equipped with integrated network capabilities that support various communication protocols such as Ethernet, Profibus, and Profinet. This versatility allows it to work with a wide variety of devices, enabling data exchange across different automation levels. The ability to connect to cloud services is another standout feature, allowing users to access real-time data remotely for monitoring and analytics.

The NCM S7 also boasts advanced data processing capabilities. With powerful processing units, it can execute complex control algorithms and manage large volumes of input and output data in real time. This is essential for industries that require precise control over their processes, such as automotive, food and beverage, and pharmaceuticals. The system’s high-speed memory and processing speed ensure that it can handle demanding tasks without lag.

In terms of technology, the Siemens NCM S7 leverages state-of-the-art cybersecurity features. As industrial control systems increasingly become targets for cyber threats, the NCM S7 incorporates advanced security protocols to safeguard sensitive data and ensure the integrity of the control processes. This includes features such as secure communication channels and user authentication.

Another key characteristic of the NCM S7 is its flexibility. The system can be easily scaled and adapted to meet the specific needs of various applications. Users can increase the number of input/output channels or integrate additional modules without significant downtime. This adaptability makes the NCM S7 an ideal choice for both small-scale operations and large industrial environments.

Moreover, the user-friendly interface simplifies configuration and programming tasks, allowing engineers and technicians to set up and troubleshoot the system with ease. Siemens has also invested in comprehensive support and training resources to help users maximize the system’s potential.

In conclusion, the Siemens NCM S7 stands out as a pivotal element in modern industrial automation. With its robust connectivity, advanced data processing capabilities, cybersecurity features, and flexibility, it empowers businesses to optimize their production processes and embrace the future of Industry 4.0.
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