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  Siemens & Simatic , Trademarks of Siemens Corporation.  

New Siemens PLC: S7-1200SIMATIC S7-1200
The modular controllers for innovative system solutions in the manufacturing industry
The SIMATIC S7-1200 controller is modular and compact, versatile, a secure investment, and is powerfully fit for a full range of applications. A scalable and flexible design, a communication interface that fulfills the highest standards of industrial communication and a full range of powerful integrated technology functions make this controller an integral part of a complete and comprehensive automation solution.
Scalable and Flexible Design
Up to eight Signal Modules can be connected to the largest CPUs. One Signal Board can be connected to all CPUs, allowing you to customize the CPUs by adding digital or analog I/O to the controller without affecting its physical size. The modular concept provided by the SIMATIC S7- 1200 allows you to design a controller system to exactly fit your application needs.
Up to 50 KB of integrated work memory is provided with a floating boundary between the user program and user data. Up to 2 MB of integrated load memory and 2 KB of integrated retentive memory are also provided.
Up to 3 Communication Modules can be added to any of the SIMATIC S7-1200 CPUs. The RS485 and RS232 Communication Modules provide the connection for performing Point-to-Point serial communication. This communication is configured and programmed using extended instructions or with the library functions, USS drive protocol and Modbus RTU Master and Slave protocols, which are included within the STEP 7 Basic engineering system.
Integrated PROFINET Interface
The integrated PROFINET interface is used for programming, as well as for Siemens HMI and PLC-to-PLC communication. Additionally, it supports communication with third-party devices using open Ethernet protocols. This interface features an RJ45 connector with auto-crossover functionality and provides for data transmission rates at 10/100 Mbit/s. It supports up to 16 Ethernet connections and the following protocols: TCP/IP native, ISO on TCP, and S7-Communication.
Integrated Technology Functions
High-speed inputs The new SIMATIC S7-1200 controller comes with up to 6 high-speed counters. Three inputs at 100 kHz and three inputs at 30 kHz are integrated for counting and measuring.
Siemens Simatic PLC: S7 200SIMATIC S7-200 : Micro Siemens PLC for less complex automation tasks
SIMATIC S7-200 applications range from replacing relays and contactors to handling less complex automation tasks in standalone mode, in networks and within distributed configurations - That is Siemens Automation.
To save costs, the S7-200 plc is increasingly being employed in areas that previously required special electronics.
In addition to the comprehensive basic functionality of the five available Siemens S7 200 PLC CPUs a wide range of I/O and function modules provides solutions tailored to the customers requirements.
Siemens PLC: S7-300 , Siemens PLC 300, Siemens 300 PLCSIMATIC S7-300 - Siemens S7 300 PLC
The modular Siemens controllers for innovative system solutions in the manufacturing industry, The SIMATIC S7-300 has been designed for innovative system solutions with the focus on manufacturing engineering, and as a universal automation system, it represents an optimal solution for applications in centralized and distributed configurations:
The product range comprises 7 Standard S7 300 CPUs, 6 Compact Siemens 300 PLC CPUs, 6 failsafe Siemenes PLC 300 CPUs and 2 Technology Siemens PLC CPUs. 
S7 300 PLC Highlights:
The ability to integrate powerful Siemens Controller CPUs with Industrial Ethernet/PROFINET interface, integrated technological functions, or fail-safe designs make additional investments unnecessary. 
The S7-300 can be set up in a modular configuration without the need for slot rules for I/O modules. There is a wide range of modules available both for the centralized and the distributed configuration with ET 200M
The Micro Memory Card as a data and program memory makes a backup battery superfluous, and with it, part of the maintenance costs. In addition, an associated project, including symbols and comments, can be stored on this memory card to facilitate service calls. 
The Micro Memory Card also enables simple program or firmware updates. The Micro Memory Card can be used during operation for storing and accessing data, e.g. for measured value archiving or recipe processing. 
In addition to standard automation, safety technology and motion control can also be integrated in an Siemens S7-300
Many of the S7-300 components are also available in a SIPLUS version for external environmental conditions, e.g. extended temperature range (-25...+60 ) and for use where there is aggressive atmosphere/condensation. ...
S7 400, Siemens PLC: 400 PLC, Siemens 400 PLC, Sieemens PLC 400SIMATIC S7-400 - Siemens S7 400 PLC
The Power Controller for system solutions in the manufacturing and process industries Within the Siemens Controller family, the SIMATIC S7-400 PLC is designed for system solutions in the manufacturing and process Siemens automation.
The product range comprises 9 Standard CPUs, 2 failsafe and 2 high available CPUs.
The following features make the SIMATIC S7-400 the most powerful Simatic PLC:
The S7-400 PLC is especially suitable for data-intensive tasks in the process industry. High processing speeds and deterministic response times guarantee short machine cycle times on highspeed machines in the manufacturing industry. The highspeed backplane bus of S7-400 ensures efficient linking of central I/O modules. The S7-400 PLC is used preferably to coordinate overall plants and to control lower-level communications lines with slave stations; this is guaranteed by the high communication power and the integral interfaces. The power of the Simatic S7-400 PLC is scalable thanks to a graded range of S7-400 CPUs; the capacity for I/O is almost unlimited. The power reserves of the S7 400 CPUs enable new functions to be integrated without further hardware investment, e.g. processing of quality data, user-friendly diagnosis, integration into higher-level MES solutions or high-speed communication via bus systems. The Siemens S7-400 PLC can be structured in a modular way without any slot rules; there is a widely varied range of modules available both for centralized configurations and distributed structures. 
The configuration of the distribuded I/O of the S7-400 can be modified during operation. In addition signal modules can be removed and inserted while live (hot swapping). This makes it very easy to expand the system or replace modules in the event of a fault. 
The storage of the complete project data including symbols and comments on the Simatic PLC CPU simplifies service and maintenance calls Safety technology and standard automation can be integrated into an Siemens S7-400 Siemens controller; the plant availability can be increased by the redundant set-up of the S7-400 PLC
Many of the S7-400 components are also available in a SIPLUS version for external environmental conditions, e.g. extended temperature range (-25 ~ +60) and for use where there is aggressive atmosphere/condensation. 

About SIMATIC S5 PLC, Please visit Siemens S5 PLC.....

About New Siemens PLC: s7-1200 and s7-1500 

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