What are the Models of SIEMENS PLC?

Siemens is a German MNC headquartered in Munich founded by Ernst Werner Siemens in 1847. It is the largest industrial manufacturing company in Europe.

Types of Siemens PLC

Based on your suitable applications and requirements, Siemens PLCs are classified into


2)S7 200 Smart PLC

3)S7 200 PLC






Logo PLC is a very basic model of Siemens PLC. So, its I/O handling capacity is very low.

This type of PLC mainly used in small-scale industries.

Logo! soft software is used for programming purposes.


Need physical access to program it

Complexity exceeds the amount of available programming instructions

S7 200 Smart PLC

It’s a Compact - modular type PLC. It is also used for small scale industry like Logo PLC

It has 38 Analog I/O capacity and 256 Digital I/O capacity

RS485 communication port is available.

Step 7 Microwin is the software used for programming purpose


It is a bus-linked platform (a serial connector to all modules)

This is a mini modular PLC for the low and mid-range applications

Can expand the I/O without any issues when the tasks increase but there is limit foe expansion.

It has inbuilt motion control applications.

User-friendly handling and uncomplicated design

For S7-300 you can use two software for programming

1)Step 7 V5.x + WinCC flexible

2)TIA Step 7 Professional + TIA WinCC

It is available in

a) Standard

b) Compact


d)Technology T version


It is also based on S7-300

It has fail-safe automation system for plants with safety requirements for production technology

It had ET 200s and ET 200M distributed I/O stations.

We can connect safety-related modules via PROFIBUS DP with PROFIsafe profile

For S7-300 you can use two software for programming

1)Step 7 V5.x + WinCC flexible

2)TIA Step 7 Professional + TIA WinCC


It is a rack-based system that means a Multi-pin backplane linking all modules from power supply to I/Os.

S7-400 designed for system solutions for manufacturing and process automation.

This process controller is suitable for data-intensive activities that are exceptionally common for the process industry.

S7-400 CPU available in

a) Standard

b) Failsafe F

c)High availability H

Software used for programming are

1)Step 7 Basic

2)TIA Portal

S7-1200 Signal Modules

S7-1200 have a compact configuration and can be used in a wide variety of applications

SIMATIC S7-1500/ET 200MP signal or peripheral modules are the interfaces between the controller and the process.

They can be used centrally on the SIMATIC S7-1500 CPU or on the decentralized SIMATIC ET 200MP peripheral system.

It has a very high processing speed.

It comes with an integrated power supply and onboard digital I/Os and onboard analog I/Os

It also has high-speed motion control I/O.

Can be added communication board, battery board, or signal board without affecting the size of the CPU.

PROFINET isochronous real-time (IRT) for maximum quality

Shortest input delay of 50 μs for Digital input modules

Quick analog modules with a conversion time of 62.5 μs or 125 μs for 8 channels

TIA Portal software used for programming


It is designed for fast market changes.

CPUs, I/O modules, and commination modules can be added, up to 32 expansion modules, as needed to fit your project.

S7-1500 has an inbuilt display and keypad that allows for basic configuration and diagnostics.

It has a scalable configuration that incorporates a CPU at least one system power supply module, a communication module, or signal module as needed up to 32 modules

It has inbuilt PROFINET ports

It is available in

a) Standard

b) Failsafe F.

Step 7 TIA Portal software is used for programming S7-1500.

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