Programming FCs (Functions) and FBs for S7 Ethernet CPs

5.2Setting Parameters for FC Calls

Before describing the FCs in detail, a few general comments on calling and setting parameters for FCs will be useful in this point.

It is possible to make the following general statements about the following parameter groups that occur in all FCs:

SParameters for CP and connection assignment (input parameters)

SParameters for specifying a CPU data area (input parameters)

SStatus information (output parameters)

Calling Communication Blocks for an S7-300

Caution

The communication blocks for S7-300 (SIMATIC NET block libraries for S7-300 in STEP 7) must not be called in more than one priority class! If, for example, you call a communication block in OB1 and in OB35, block execution could be inter- rupted by the higher-priority OB.

If you call blocks in more than one OB, you must write your program so that a communication block that is currently executing cannot be interrupted by another communication block (for example by disabling/enabling SFC interrupts).

5.2.1Parameters for CP and Connection Assignment (input parameters)

When you call an FC, you transfer the module start address of the Ethernet CP in the CPLADDR or LADDR parameter. The module start address of the Ethernet CP can be found in the properties dialog of the CP in the ”Address/Input” tab (can be selected in the SIMATIC Manager or in HW Config).

With connection-oriented jobs, you must also reference the connection to be used by its connection ID. You will find this in the properties dialog of the connection under “Block parameters” (refer to the information in NetPro).

SIMATIC NET NCM S7 for Industrial Ethernet

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Siemens appendix Setting Parameters for FC Calls, Calling Communication Blocks for an S7-300
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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.
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