SIMATIC S7-200 Programmable Controller
System Manual
Introduction to SIMATIC S7-200
The SIMATIC S7-200 series is a compact yet powerful programmable controller designed by Siemens for small automation systems. It provides a flexible and cost-effective solution for a variety of industrial applications. The S7-200 features advanced functionality, ease of programming, and integration capabilities, making it ideal for controlling simple to moderately complex processes.
This system manual provides a detailed overview of the S7-200 hardware, programming, communication features, and troubleshooting techniques.
Chapter 1: Overview of S7-200
1.1 Key Features
- Compact Design: Space-saving design for installation in small control panels.
- Integrated I/O: Built-in digital and analog inputs/outputs for seamless control.
- Flexible Communication: Supports various protocols, including PPI, MPI, and MODBUS.
- High-Speed Processing: Capable of handling time-critical tasks.
- User-Friendly Programming: Compatible with STEP 7-Micro/WIN software.
1.2 Applications
The S7-200 is suitable for:
- Machine and equipment control.
- Monitoring systems in HVAC.
- Small conveyor systems.
- Automated laboratory devices.
Chapter 2: Hardware Components
2.1 CPU Modules
The S7-200 series includes several CPU models to accommodate different application requirements:
- CPU 221: Entry-level model with 6 inputs and 4 outputs.
- CPU 222: Intermediate model with additional I/O capacity.
- CPU 224: Advanced model with more memory and I/O.
- CPU 226: High-end model for larger applications.
2.2 Expansion Modules
The S7-200 supports various expansion modules to increase I/O capacity:
- Digital input/output modules.
- Analog input/output modules.
- Specialty modules, such as communication adapters and positioning modules.
2.3 Power Supply
Each CPU module includes an integrated power supply. Ensure the supply voltage (24V DC) matches the system requirements.
Chapter 3: Installation and Wiring
3.1 Mounting
- Use DIN rails or panel mounting for secure installation.
- Leave sufficient space around the module for ventilation.
3.2 Wiring
- Input Connections: Connect sensors and switches to the digital/analog input terminals.
- Output Connections: Connect relays, motors, and actuators to the output terminals.
- Grounding: Ensure proper grounding to minimize electrical noise.
Chapter 4: Programming the S7-200
4.1 Programming Environment
The S7-200 is programmed using STEP 7-Micro/WIN, an intuitive software that supports:
- Ladder Diagram (LD).
- Statement List (STL).
- Function Block Diagram (FBD).
4.2 Basic Programming Concepts
- Inputs (I) and Outputs (Q): Represent physical devices connected to the PLC.
- Timers and Counters: For time-based and sequential control.
- Data Blocks: Store variables and parameters used in the program.
4.3 Example Program:
Objective: Start a motor when a button is pressed and stop it with another button.
Ladder Logic:
- Input I0.0: Start button.
- Input I0.1: Stop button.
- Output Q0.0: Motor relay.
