SIMATIC S7-200 SMART PLC

Siemens SIMATIC S7-200 SMART is a compact Micro PLC designed for machine automation and small-to-medium control applications. The basic concept is simple: the PLC receives signals from sensors and switches, processes them according to the user program, and controls outputs such as motors, valves, contactors, lamps and other actuators.

1. What is S7-200 SMART PLC?

S7-200 SMART combines a microprocessor, power supply, digital inputs and outputs into a compact PLC unit. Depending on the CPU model, additional expansion modules and signal boards can be added for more I/O, analog signals and communication functions.

Basic working concept

Field Devices → PLC Inputs → CPU Processing → PLC Outputs → Actuators

For example:

Proximity Sensor → PLC DI → S7-200 SMART CPU → PLC DO → Motor Contactor

The PLC continuously monitors input conditions, executes the programmed logic and updates its outputs.

2. Main Parts of S7-200 SMART

A typical S7-200 SMART system consists of:

CPU

The CPU is the main brain of the automation system. It executes the PLC program and controls the connected inputs and outputs.

Digital Inputs – DI

Digital inputs receive ON/OFF signals from devices such as:

• Push buttons
• Limit switches
• Proximity sensors
• Photoelectric sensors
• Level switches
• Emergency-related status signals

Digital Outputs – DO

Outputs control devices such as:

• Contactors
• Solenoid valves
• Relays
• Indicator lamps
• Buzzers
• Other control devices

Analog I/O

Where required, expansion modules can be used for analog signals such as:

• 0–10 V
• 4–20 mA
• Analog temperature/process signals

3. How S7-200 SMART Works

The PLC works through a continuous control process.

Step 1 – Input Reading

The PLC reads the condition of connected field devices.

Example:

• Start push button = ON
• Stop push button = OFF
• Motor overload = Normal
• Sensor = ON

Step 2 – Program Execution

The CPU processes these signals according to the programmed control logic.

For example:

If START = ON AND STOP = OFF → Motor Output = ON

Step 3 – Output Update

The PLC changes the output according to the result of the program.

For example:

Q0.0 = ON → Motor Contactor Energized

Step 4 – Continuous Monitoring

The PLC repeats this process continuously, allowing the machine to respond to changing sensor and operator conditions.

4. S7-200 SMART CPU Concept

S7-200 SMART offers different CPU configurations according to I/O requirements and application complexity.

For example, Siemens documentation identifies standard CPU families such as SR20, ST20, SR30, ST30, SR40, ST40, SR60 and ST60, with different I/O and output configurations.

The naming also gives useful information:

• S – Standard CPU family
• R – Relay output
• T – Transistor output
• Number – Indicates the onboard digital I/O count

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