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SIEMENS Simatic S7-300 PLC

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S7-300 Powerful, compact and cost-effective

The SIMATIC S7-300 universal Controllers saves on installation space and features a modular design. A wide range of modules can be used to expand the system centrally or to create decentralized structures according to the task at hand, and facilitates a cost-effective stock of spare parts. SIMATIC is known for continuity and quality.

Do you want to further utilize the investment into your machine or plant? The well-engineered, proven controller SIMATIC S7-300 will be available at least until 2020.

SIMATIC S7-300 is within Totally Integrated Automation the most sold Controller.

Communication processors are used for connecting S7-300 to the different bus systems / communication networks as well for point-to- point link. According to application case and module different protocols and different bus systems are available like PROFIBUS DP or Industrial Ethernet.

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.
The CPs can also easily link third-party systems to the SIMATIC S7. Thanks to the great flexibility of the CPs, different physical transmission media, transmission rates or even customized transmission protocols can be implemented.
For each CP, there is a configuring package on CD with electronic manual, parameterization screen forms and standard function blocks for communication between the CPU and the CP.
The configuration data are stored in a system block and backed up in the CPU. When modules are replaced, the new module is therefore immediately ready for use.
The interface modules for the S7-300 are available in three versions, each with one interface for the different physical transmission media.

Technical data

S7-300 Communication modules

CP 340Point-to-point linkmore
CP 341Point-to-point linkmore
CP 342-5 FOPROFIBUS DP (fiber optic)more
CP 343-1 LeanPROFINET / Industrial Ethernetmore
CP 343 1PROFINET / Industrial Ethernetmore
CP 343-1 AdvancedAdvanced PROFINET / Industrial Ethernetmore
CP 343-2AS-Interface (Master)more
CP 343-2PAS-Interface (Master)more
TIM 3V-IE AdvancedWANmore


• Reduced start-up times due to the easy configuration with STEP 7
• Reduced downtimes and service times in the event of a fault through LED displays

Design and function

The CPs have a rugged plastic housing with LEDs for displaying operating states and faults.
They show all advantages of the SIMATIC S7-300- Design, e.g.
• Compact design
• Easy installation
• User friendly wiring, etc.

Technical data

CPU Range
SIMATIC S7-300 cpu

Components for SIMATIC S7-300
Components for S7-300

 SIMATIC S7-300 cpu


Wood, glass, stone and metal processing
Packaging machines
General machine manufacturing
Machine tools
Textile machines
Rubber and plastic industry


High degree of accuracy and dynamic response

Specialized and universal modules with a wide range of functions

CPU is not involved since the functionality is stored in the firmware of each module

Quick reaction times (deterministic dynamic response)

Engineering with configuring tool, integrated into STEP 7

Design and function

Function modules are intelligent modules that independently execute the technological tasks and thus reduce the load on the CPU.
Configuration tools based on STEP 7 and STEP 7-Micro/WIN are available for setting parameters. Parameterization and commissioning are performed via user-friendly screens.
The function modules of the S7-300 can also be used in a distributed configuration in the
ET 200M I/O system – also with PC-based automation with WinAC.

Range of application

In the first instance SIMATIC S7-300 is used for innovative system solutions in manufacturing technology, especially for automobile industry, mechanical engineering in general and especially for special machine building and serial production of machines (OEM), at plastics processing, packaging industry, food and beverage industry and process engineering
As an all-purpose automation system is S7-300 the ideal solution for applications, which need a flexible concept for central as well as local configuration
For applications, which require a especial robustness because of surrounding conditions, we have the SIPLUS extreme devices

Particularly in the finishing technique the S7-300 is used in the following industries:
Automobile industry
General mechanical engineering
Building of special machines
Series mechanical engineering, OEM
Plastics processing
Packaging industry
Food and Beverage industry
Process engineering
Fast counting/fairs with direct access on the hardware counters
Simply positioning with direct control the MICROMASTER frequency static frequency changers
PID-Regulation with integrated functional module


Thanks to their high processing speed, the CPUs enable short machine cycle times.
The S7-300’s range of CPUs provides the right solution for every application, and customers only pay for the performance actually required for a specific task
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.
Integral PROFINET interfaces enable simple networking of the controllers, and simple data exchange with the operations management level
The narrow module width results in a compact controller design or a small control cabinet.
The ability to integrate powerful CPUs with Industrial Ethernet/PROFINET interface, integrated technological functions, or fail-safe designs make additional investments unnecessary.

Design and function
Table CPU Innovations
s7-300 cpu
The S7-300 enables space-saving and modular configurations. In addition to the modules, only a DIN rail is required for hooking in the modules and screwing them into place.
This results in a rugged and EMC-compatible design.
The build-as-you-go backplane bus can be expanded by simply plugging in additional modules and bus connectors. The varied range of the S7-300 can also be used for centra lexpansions or the construction of distributed structures with ET 200M; thereby producing very cost-effective spare parts handling.

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 (EUs) Up to 32 modules can be used in the centralrack and up to 8 per expansion unit. Interface modules(IMs) handle communication between the individual racksautonomously. In the case of plants covering wide areas, CCs/EUs can also be installed at greater distances from eachother (up to 10 m).
In a single-tiered configuration, this results in a maximumconfiguration of 256 I/O, and in multi-tiered configurations upto 1024 I/O. In distributed configurations with PROFIBUS DP,65536 I/O connections are possible (up to 125 stations, suchas ET 200M via IM 153). The slots are freely addressable, thatis, there are no slot rules.
The extensive range of S7-300 modules is also used in distributedautomation solutions.
The ET 200M I/O system that hasthe same construction as the S7-300 can be connected via Interface modules not only to PROFIBUS but also to PROFINET.

SIEMENS Simatic S7-300 Product Manual


Manual & Datasheet

#FileDescriptionDate addedAdded byFile sizeDownloads
1 pdf Siemens S7-300 Siemens s7-300 PLC data sheet
Siemens S7-300
08/22/2017 09:54Miss Long624 KB217

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