Project Description

The most powerful Automation System within SIMATIC

Superb communication capability and integrated interfaces make the SIMATIC S7-400 process controller ideal for larger tasks such as the coordination of entire systems. The graded range of CPUs enables scalable performance and the capacity for I/O periphery is virtually unlimited. What’s more, process controller signal modules can be inserted and removed while the system is live (hot swapping), making it very easy to expand the system or replace modules.

S7-400 Communication processors

Communication processors are used for connecting S7-400 to the different bussystems / communication networks as well for point-to- point link.Point-to-point connection:Point-to-point link via communications processors (CPs) is an extremely powerful and low-cost alternative to bus systems. The advantage of point-to-point links over bus systems is especially pronounced when only a few (RS 485) devices are to be connected to the SIMATIC S7.

S7-400 Function modules

The multi-facetted module range of S7-400 allows modular customization to suit the most varied tasks.
Apart from the CPUs with integrated functions and interfaces, there is a wide range of special modules in S7-400 design for technology.

S7-400 Signal modules

Signal modules are the interface of the controller to the process. A host of different digital and analog modules provide exactly the inputs/outputs required for each task. Digital and analog modules differ as regards the number of channels, voltage and current ranges, electrical isolation, diagnostics and alarm functions, etc.

S7-400 CPUs

here is a graded range of CPUs from the entry-level CPU right up to the high-performance CPU for configuring the controller. All CPUs control large quantity structures; several CPUs can work together in a multicomputing configuration to boost performance. Thanks to their high processing speed and deterministic response times, the CPUs enable short machine cycle times.

سری پی ال سی زیمنس S7400 یکی از بهترین PLC ها در جهان


An S7-400 system basically comprises a rack, power supply, and central processing unit. It can be installed and expanded in a modular way. All modules can be positioned freely next to the power supply plugged in on the left. The S7-400 has a rugged design without a fan. Signal modules can be hotswapped.A multi-faceted module range can be used for central expansions as well as for simple configuration of distributed topologies with ET 200.In a centralized expansion, additional mounting racks are connecteddirect to the central controller.In addition to the standard mounting racks, aluminum mounting racks with 9 and 18 slots are also available. These aluminum racks are highly resistant to unfavorable environmental conditions, and they are more rigid and around 25% lighter.

Design and function s7400 Modularity

An important feature of the S7-400 is its modularity. The powerful backplane bus of the S7-400 and the DP communication interfaces that can be plugged directly onto the CPU allow the high-performance operation of many communication lines. This permits, for example, the division into one communications line for HMI and programming tasks, one line for high-performance and equidistant motion control components, and one “normal” I/O fieldbus.Additionally required connections to MES-/ERP systems or the Internet via SIMATIC IT can also be implemented. The S7-400 can be expanded centrally or in a distributed configuration depending on the task. Add-on devices and interface modules are available centrally for this purpose. Distributed expansion is possible over the PROFIBUS or PROFINET interfaces integrated in the CPUs. If required, communication processors (CPs) can also be used.