The SIMATIC S7-300 is the modular mini PLC for low and medium performance ranges.
The modular and fan-free configuration, the easy implementation of distributed structures and the user-friendly operation make the SIMATIC S7-300 the economic and convenient solution for the most varied tasks in low and medium performance ranges.
Applications for the SIMATIC S7-300 include:

· Special machines 
· Textile machines 
· Packaging machines 
· General mechanical engineering 
· Controller manufacture 
· Machine-tool construction 
· Installation engineering 
· Electrical and electronic industry and trade.

A number of CPUs with different power ratings and an extensive module range with many user-friendly functions permit the user to use only the modules required for the application in hand. If tasks need to be added, the control can be retrofitted at any time using additional modules.
The SIMATIC S7-300 is a universal controller.

Highest industrial capability thanks to a high degree of electromagnetic compatibility and a high degree of endurance against shock and vibration.

Analog input/output modules contain analog inputs/outputs for the automation system. Analog sensors and actuators can be connected to the automation system via these modules. The use of analog input/output modules provides the user with the following advantages:

• Optimum adaptation: using any desired arrangement of modules, the number of inputs/outputs can be matched to the task to be performed. Superfluous investments no longer exist.
• High-performance analog technology: A variety of input/output ranges and high resolution permit the connection of a multitude of analog sensors and actuators.

Digital input/output modules possess digital inputs/outputs for the automation system. Digital sensors and actuators can be connected via these modules.
Use of the digital input modules offers the following advantages for users:

• Optimum adaptation: The number of inputs/outputs can be adapted to the respective task using optional combination of modules. Superfluous investments no longer exist
• Flexible process connection: The automation system can be connected to the process using many different digital actuators and sensors 

PLCs don't just perform open-loop control these days, they also handle

· Closed-loop control,
· Positioning,
· Counting, proportioning,
· Valve control and much more.

For this purpose, there are intelligent I/O modules. They are microprocessor-controlled and execute time-critical special tasks completely autonomously, and they have a direct connection to the process via their own input/output channels. This avoids additional loads for the CPU.

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