SIMATIC S7-300 PLC CPU - OstBridge Siemens Distributor

Products Mode: 6ES7312-1AE14-0AB0
Place of Origin: DE

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A hierarchical CPU family with an extremely wide performance range is available for configuring the controller.

The product range includes 7 standard CPUs,

7 compact CPUs, 5 fail-safe CPUs and 3 technology CPUs.

Existing CPUs are only 40mm wide

The SIMATIC S7-300 is part of our Totally Integrated Automation design and is the most sold controller.

Scope of applications

  • In the first instance, the SIMATIC S7-300 is used for innovative system solutions in manufacturing processes, in particular for the automotive industry, mechanical engineering in general, in particular for special machine building and serial production (OEM) of machines, and Plastics processing, packaging industry, food and beverage industry and process engineering
  • As a versatile automation system, the S7-300 is the ideal solution for applications that require a flexible design for central and local configuration.
  • For special hardening requirements due to environmental conditions


Especially in post-processing technology, the S7-300 can be used in the following industries:

• Automotive industry

• General Mechanical Engineering

• Special machine building

• Series Mechanical Engineering, OEM

• Plastic processing

• Packaging industry

• Food and beverage industry

• Process engineering

• Fast counts/fairs with direct access to hardware counters

• Simple positioning and direct control of MICROMASTER frequency static drives

• PID-Regulation with integrated function blocks


• Due to the high processing speed, the CPU can achieve very short machine cycle times.

• S7-300 series CPUs can provide suitable solutions for various applications, customers only pay for the performance that is actually required for a specific task

• The S7-300 is built on a modular configuration without slot rules for I/O modules

• Existing rich modules for centralized configuration and distributed configuration with ET 200M.

• The integrated PROFINET interface enables simple networking of the controller and easy data exchange with other operational management levels

• The narrow module width enables compact module designs or small control cabinets.

• Ability to integrate powerful CPUs with Industrial Ethernet/PROFINET interfaces, integrated technology functions, or fail-safe design, thus avoiding additional investments.



The S7-300 enables space-saving and modular configuration. In addition to the modules, only a DIN mounting rail is required to hold the modules and rotate them into place.

This results in a robust and EMC-compatible design.

The ready-to-use backplane bus can be expanded by simply plugging in additional modules and bus connectors. The extensive range of the S7-300 series can be used both for central expansion and for building distributed structures with ET 200M; thus enabling cost-effective spare parts control.

Expansion options

If the automation task requires more than 8 modules, the central controller (CC) of the S7-300 can be expanded using expansion units (EU). There can be a maximum of 32 modules on the center shelf, with a maximum of 8 on each expansion unit. An interface module (IM) can handle the communication between the various racks simultaneously. CC/EU can also be installed at long distances from each other (up to 10m) if the plant covers a wide area.

In a single-level structure, this enables a maximum configuration of 256 I/Os, and in a multi-level structure up to 1024 I/Os. In a distributed configuration with PROFIBUS DP, there can be 65536 I/O connections (up to 125 stations, eg ET200M via IM153). Slots are freely addressable, so slot rules are not required.

The wide variety of S7-300 modules can also be used in distributed automation solutions.

The ET 200M I/O system with the same structure as the S7-300 can be connected not only to PROFIBUS but also to PROFINET via interface modules.


SIMATIC S7-300 Series Item Numbers:      
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