Programming FCs (Functions) and FBs for S7 Ethernet CPs

 

 

 

CPU

Ethernet CP

 

 

 

CPU

Ethernet CP

STEP 7 user program

User data areas

AG_SEND

AG_RECV

send

receive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STEP 7

 

 

 

 

 

 

 

 

 

 

 

 

 

user program

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

receive

 

 

 

 

 

 

 

User data areas

 

 

 

 

 

 

 

 

 

 

 

 

Connection

 

 

 

 

 

 

AG_RECV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

send

 

 

 

 

 

 

 

AG_SEND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note

Unless specifically stated otherwise, the information on this and the following pages refers to AG_SEND / AG_LSEND or AG_RECV / AG_LRECV.

Specifying the Data Area on the CPU

When you call an FC, you transfer the address and length of the data area in the CPU. Remember, that the maximum length of the data area depends on the block type and block version being used.

SAG_SEND and AG_RECV

Up to version V3.0 of these blocks, a maximum of 240 bytes could be sent or received. The current block versions allow a data area of up to 8192 bytes for an S7-300. With an S7-400, the FCs AG_LSEND / AG_LRECV must still be used for larger data areas.

SAG_LSEND / AG_LRECV

Using the CPs of the S7-400 and with earlier versions of the S7-300, larger data areas can only be transferred with the FCs AG_LSEND or AG_LRECV. Please check the length of the data area in the product information.

The following table shows the limit values of the various connection types.

SIMATIC NET NCM S7 for Industrial Ethernet

171

Release 6/2003

C79000–G8976–C129–07

Page 171
Image 171
Siemens NCM S7 appendix Aglsend / Aglrecv

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.