Siemens NCM S7 Data Exchange S7 CPU Ethernet CP, FC Calls Faster than the Transmission Time

Models: NCM S7

1 255
Download 255 pages 41.39 Kb
Page 82
Image 82

SEND/RECEIVE Interface in the User Program

3.3Data Exchange S7 CPU <–> Ethernet CP

The Ethernet CP processes the send and receive jobs independent of the CPU cycle and requires one transmission time. The interface to the user program with the FCs is synchronized by an acknowledgment. Two situations must be distinguished:

SThe CPU cycle is faster than the transmission time.

SThe CPU cycle is slower than the transmission time.

Note

Please refer to the sequence charts for the FCs in Chapter 6. These charts show how to handle the SEND/RECEIVE interface in the user program for problem-free data exchange.

Remember the points below about the CPU cycle and transmission time.

FC Calls Faster than the Transmission Time

If a block is called again in the user program before data were transferred or received, the procedure is as follows on the interface of the FCs:

SAG_SEND/AG_LSEND:

No further job is accepted until the transmission of the data on the connection has been acknowledged by the Ethernet station. During this time, the user program receives the message “job active” until the Ethernet CP can accept the next job on the same connection.

SAG_RECV/AG_LRECV:

The job is acknowledged with the message “no data available yet” if there are no received data on the Ethernet CP. The user program receives this message in the CPU cycle until the Ethernet CP has received data again on the connection.

82

SIMATIC NET NCM S7 for Industrial Ethernet

Release 6/2003

C79000–G8976–C129–07

Page 82
Image 82
Siemens NCM S7 appendix Data Exchange S7 CPU Ethernet CP, FC Calls Faster than the Transmission Time

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.