The automation industry giant Siemens products in the long history once again cast a ripple stirred up a gravel and gravel of the name Fengyun called S7-1200, from the product names on the S7-200 look more like a extension or upgrade, and here I want to explain this product in detail, the explanation I think we should look at before the Siemens PLC family history.1, the history of Siemens plc Into China from Siemens since 1872, the Chinese way forward automation has been accompanied by Siemens automation products, said Siemens PLC to say that everyone familiar with the type S7-200/300/400, but may not know these people Not all products are of German descent, Siemens,S7-300/400 STEP7 programming and using the S7-200 is applied STEP7Micro/win programming, there have been many people sigh why the products are familiar with the S7-300 S7 then go on to study -200 for a product like product and need to learn from scratch and vice versa. Why is this? This is because the Siemens S7-200 product is a U.S. company by acquiring and developing software products, in order to compete for market integration of low-end PLC, listed. I believe we can also see S7-200 SM programming model and set of special registers can find some American and Japanese-style traces of PLC programming model, and Siemens has been looking for the right time is of German origin, development of low-end PLC products, in 2009 S7-1200 years, this product came into being.2, S7-1200 market position Friends said the controlled S7-1200 S7-200 is a simple upgrade, it can be said that the remark but not the why, because it does not upgrade but instead, why do I say! S7-1200 because this product is a product of Siemens PLC low-end punch. Siemens has stopped except in China, outside of S7-200CN S7-200 series product line, S7-200CN compete with its low price but also the automation of the third market share of developing countries. Low-end market in Europe will all be covering the S7-1200. There are many manufacturers in China have launched a module compatible with S7-200 Siemens, which makes low-end market share in part accounted for, so in order to reduce costs and keep the market to continue for a series of brilliant 200CN, while Siemens will bring the latest communications and control technology used in the S7-1200 This product will also be on the same Siemens S7-1200 this product with a strong low-end to create a global PLC market. 3, S7-1200 product positioning S7-1200 positioning of this product is still quite clear, it is aimed at low-end product line of small PLC, the hardware structure consists of compact, modular composition, the system IO points, memory capacity, S7-200 more than 30% fully meet the market demand for small PLC, a lot of discrete industries and process control industries of small units and systems in the discrete points are within 200 points, analog points within the 36-48 point, so at this time S7-200 will not respond, the customer can choose PLC S7-300 medium-sized car in the form of large horse-drawn to face engineering which also caused some cost to the customer′s waste. The S7-1200 This product is designed on the capacity of the accumulation of the full needs of customers over the years obtained. f) control object-based programming Just mentioned above, an increase of S7-1200 block and STRUCKT DB data types, because with these two essential conditions for the system This leads to a very important function, which is based on editorial and programming control object , add the control object only need to click the mouse. Add a new object (such as a shaft or a PID controller), the project configuration system "Add new object" (Add new object) the window will display related settings. According to the function of the object as object naming. Fine-tune the various objects, the user can use the functional description of the complete distribution of all the information object, the editor will immediately open the object.g) Integrated HMI engineering Siemens STEP 7 Basic includes a powerful HMI software Siemens WinCC Basic, for the streamlining of the Siemens HMI panel family for efficient programming and configuration. Efficient engineering include, for example: drag and drop directly through the intelligent use of process control HMI project value. HMI is part of the project, HMI data can be always consistent. The connection between the HMI and the PLC can be centrally defined. You can also create multiple templates and assigned to the other screen. Fully integrated HMI functionality to streamline the configuration of Siemens HMI panel family has become very convenient and efficient. h) communication interface, integrated Profinet Automation respected in the current trend of industrial Ethernet communications, the Siemens line of products has already begun, "a helmet consistent" all on the Profinet interface, while the low-end products alone, or stay S7200 S7 Ethernet communication protocol in this level, this is why! Because Siemens has a Profinet interface to S7-1200 to lead the market. S7-1200 supports traditional Ethernet S7 communication also supports Profinet Industrial Ethernet bus communication is mainly used to streamline the series Siemens HMI
panel (for visualization); other controllers (for communication between PLC); third-party devices (for optional advanced integration) i) a flexible third-party communications Third party devices and communication has always been the soft underbelly of PLC automation vendors, and S7-1200 is equipped with a CM module and its own Ethernet port supports RS232/485 communications. For RS232/485 serial communication function blocks configured by using the means of communication frames to complete the data flow of communication, and support SEND_PTP S7-1200 serial communication function blocks and RCV_PTP package that means it is easy to package a variety of serial communication protocol. The Ethernet S7-1200 for TCP and UDP provides two means of communication, and provides a standard function block T-Send/T-Receive perfect solution for communication, for example, can use these two sets of instructions out of modbus-package TCP protocol library to the user. Another character handling systems provide a rich repository of instructions (LEFT, RIGHT, DELETE, INSERT, REPLACE, VAL_STRG, STRG_VAL and S_CONV) which means that this product increased in the ASCII character processing on the communication capacity of a large number of third parties can customize characters communications (weighing, secondary instrument, SCM, etc.). 5, Seiemens plc S7-1200 product outlook Having said that above S7-1200 some of the features, but does not mean that there is no shortage of this product, "can not be pure gold no one is perfect," but this product is still in the growth process, he is not in many functions perfect, for example: do not support the Profinet CAB and IO configuration; does not support the PPI, MPI, and profibus communications; formula functions are not supported, but development of these features is not a problem for Siemens, which was only listed as early as possible in order to put some of the communication followed modules and software features have been introduced and planning in the next version of the software, so users can now scope of the project according to local conditions according to their use of this product, along with China′s rapid economic recovery and recession in Europe and America, now is the large number of Chinese equipment export situation, but there is no CE certification S7200CN series is not exported to Europe, while the S7-1200 is a good low-end compact PLC products are ideal for small development projects and equipment, and if necessary with a number of third party This product really communications equipment make the best use, I think this product will be here in the next 3 years bloom everywhere automation market. 4, S7-1200 new features of products a) compact and modular structure
Siemens Plc S7-1200 product continues the compact structure 200, CPU1214C width of only 110mm, CPU1212C and CPU1211C only the width of 90mm. Communication module and signal module size is very small, making this compact modular system saves space, resulting in the installation process provides you with maximum efficiency and flexibility. S7-1200 also adds a special structure called the IO module signal board, which is mounted on the CPU on the box were 2DI / O and 1AO This is the essence of the design of the Road, Siemens can always customize the need to supplement the IO module, the highlight the problem of minor works is that it is the uncertainty of the project is likely to occur in the course of project implementation DI / O, and AO is not enough, the AI is able to more prosperous signal channel. b) powerful control function System integrates PID control loop 16 and are able to support adaptive PID function blocks quickly, and provides a PID control parameters of debugging and observation screen, allowing users not familiar with how to adjust the PID parameters of the circumstances under control of process parameters to the required standard. System integrates up to six high-speed counters (3 100kHz, 3 30kHz), incremental encoder for accurate monitoring, frequency counts or speed the process of counting events.System integrates two high-speed output can be used as high-speed pulse output or pulse width modulated output. When configured as a PTO, they will provide a maximum frequency of 100kHz 50% duty cycle high-speed pulse output to the stepper motor or servo drives for open-loop speed control and positioning control. High-speed counter by two internal high-speed pulse output feedback. When configured as a PWM output, will generate a fixed period with a variable duty cycle output to control the motor speed, valve position, or duty cycle of heating elements.System supports the stepper motor and servo drive open loop speed control and position control. The configuration of this feature is very simple: through a process object and a common shaft running PLCopen function blocks can be realized. In addition to return (home) and jog (jog) function, it also supports the absolute, relative and speed of movement.c) the classic programming model S7-1200 using the Siemens STEP7Basic programming tools, and the use of this tool for basic and STEP7Professional the same style, provide two programming languages LAD and FBD tissue block by using OB FC function block FB DB function block programming (through background DB support can call the function block parameter), the full range of Siemens products finally unified programming style. d) complex data structures Complex data structures mean it! In fact, arrays, structures consisting of multiple elements such data units, and low-end market rarely PLC programming language to support complex data structures, and are based on the data type of flat-type (BOOL, INT, WORD, DWORD, REAL). S7-1200 inherits the 300/400 in this product are available in high-end PLC began to support data structures such as arrays and structures.e) command parameters polymorphism Siemens classic programming instructions which are consistent with classification of data types, such as add / subtract / multiply / divide instruction based on different data types are different instructions, but in the S7-1200 programming, regardless of data type is called function, so that function blocks placed in the network in which only allow the user to select a data type, which easily the parameters of polymorphism.
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