NCM S7 Diagnostics

6.6.2Communication Connections Checklist

Table 6-6 Checklist for Typical Problems with ISO Transport / ISO-on-TCP / UDP Connections

Problem

Possible Cause

Identifying the Cause and Remedy

 

 

 

No data transfer on an

AG-SEND and AG-RECV

Check the user program.

ISO transport connection

are not called in the user

Evaluate status bytes in AG-SEND and

/

program.

AG-RECV.

ISO-on-TCP connection

or

What to do:

or only in one direction.

Receive or send buffer too

If necessary, configure FC blocks.

 

 

small or incorrect.

If necessary, correct ANY pointer.

 

 

 

 

 

 

The connection is not

Evaluate status bytes of the FC blocks or

 

established.

evaluate diagnostic buffer.

 

 

What to do:

 

 

Change the address parameters (MAC/IP

 

 

address, TSAP).

 

 

 

Data transfer too slow

Receiving device too slow

Evaluate diagnostic buffer.

 

 

Entry: “No receive resources on destination

 

 

station XX”.

 

 

What to do:

 

 

Delay the send trigger or check the destination

 

 

station and optimize reception.

 

 

 

The complete data field

LEN parameter for

What to do:

is not sent on an ISO

AG-SEND is set to the

Set the LEN parameter to the required size.

transport /

wrong value.

 

ISO-on-TCP/UDP

 

 

connection.

 

 

 

 

 

The complete data field

The buffer specified with

What to do:

is not sent on an ISO

the ANY pointer is too

Correct the LEN parameter and the ANY pointer.

transport /

small.

 

ISO-on-TCP/UDP

 

 

connection.

 

 

 

 

 

-

190

SIMATIC NET NCM S7 for Industrial Ethernet

C79000-G8976-C129–06

Page 190
Image 190
Siemens S7 appendix Communication Connections Checklist, Check the user program, Evaluate status bytes in AG-SEND

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.