Programming FCs (Functions) and FBs for S7 Ethernet CPs

Parameter

Declara-

Type

Possible

 

Remarks

 

tion

 

Values

 

 

 

 

 

 

 

LEN

INPUT

INT

On ISO

Number of bytes to be sent from the data area

 

 

 

Transport and

with this job. The possible values range from 1

 

 

 

ISO-on-TCP /

to length specified for the SEND parameter.

 

 

 

TCP:

S Note the block type:

 

 

 

1,2, to 32767

–

S7-300

 

 

 

(or up to “length

 

 

 

 

With older versions of FC AG_SEND

 

 

 

specified for

 

 

 

 

 

(up to V3.0), the data area is always

 

 

 

SEND

 

 

 

 

 

restricted to a maximum of 240 bytes.

 

 

 

parameter”)

 

 

 

 

 

The current versions allow up to 8192

 

 

 

 

 

 

 

 

On UDP:

 

bytes (2048 bytes for UDP).

 

 

 

 

 

 

 

 

1,2,...2048 (or

–

S7-400

 

 

 

up to “length

 

 

 

specified for

 

With FC AG_SEND, the data area is

 

 

 

SEND

 

restricted to a maximum of 240 bytes.

 

 

 

parameter”)

S Note on the S7-400:

 

 

 

 

 

 

 

 

Data transfer may be restricted to

 

 

 

 

LEN<=240 bytes with older versions of the

 

 

 

 

CP firmware!

 

 

 

 

For further information, see /1/

 

 

 

 

S Improved performance with shorter data

 

 

 

 

records:

 

 

 

 

Transfer of data records up to 240 bytes

 

 

 

 

results in better performance regardless of

 

 

 

 

the block type used.

 

 

 

 

 

DONE

OUTPUT

BOOL

0: Job active

This parameter indicates whether or not the job

 

 

 

1: done

was completed without errors.

 

 

 

 

As long as DONE = 0, no further job can be

 

 

 

 

triggered. DONE is set to 0 by the CP when it

 

 

 

 

accepts a new job.

 

 

 

 

For the meaning of this parameter in

 

 

 

 

conjunction with the ERROR and STATUS

 

 

 

 

parameters, refer to the following table.

 

 

 

 

 

ERROR

OUTPUT

BOOL

0: –

For the meaning of this parameter in

 

 

 

1: error

conjunction with the DONE and STATUS

 

 

 

 

parameters, refer to the follow table.

 

 

 

 

 

 

STATUS

OUTPUT

WORD see following table

Status code

The following table shows the condition codes formed by the DONE and ERROR parameters.

Condition Codes

The following table shows the condition codes formed by the DONE, ERROR and STATUS parameters that must be evaluated by the user program.

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SIMATIC NET NCM S7 for Industrial Ethernet

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Siemens S7 appendix Condition Codes, On ISO, Transport, On UDP, 2048 or
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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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