The Siemens SIMATIC S7-200 SMART CPU ST20 PLC (Part Number: 6ES7288-1ST20-0AA0) is a compact programmable logic controller designed for industrial automation, machine control, and manufacturing applications. This standard CPU belongs to the Siemens SIMATIC S7-200 SMART family and combines programmable control functions with integrated digital inputs and transistor outputs.

The controller features 12 digital inputs rated at 24 V DC and 8 digital transistor outputs rated at 24 V DC. It operates from a 24 V DC power supply within a specified range of 20.4–28.8 V DC. With 20 KB of program/data memory as specified for this model, the CPU is suitable for a range of compact automation tasks requiring dependable digital control.

The ST20 CPU supports STEP 7 Micro/WIN SMART programming software, allowing automation engineers and technicians to create, configure, monitor, and maintain PLC programs. Its Ethernet and RS-485 communication interfaces support integration with compatible automation equipment. Ethernet-based functions can include industrial communication capabilities such as PROFINET, depending on the firmware version and configuration.

The transistor outputs support fast switching for compatible control applications, including pulse-based operations where configured and supported. The controller also provides integrated functions for high-speed counting and PID control, subject to configuration and application requirements.

This Siemens PLC is suitable for manufacturing equipment, packaging machines, conveyor systems, assembly lines, automated production machinery, and industrial control panels. Its compact design and integrated I/O make it a practical choice for control systems that require programmable logic, digital signal processing, and communication with compatible industrial devices.

Technical Specifications:

• Brand: Siemens

• Product Family: SIMATIC S7-200 SMART

• Product Type: Programmable Logic Controller (PLC)

• CPU Model: ST20

• Order Number: 6ES7288-1ST20-0AA0

• CPU Type: Standard CPU, DC/DC/DC

• Power Supply: 24 V DC

• Permissible Supply Voltage: 20.4–28.8 V DC

• Digital Inputs: 12

• Digital Input Voltage: 24 V DC

• Digital Outputs: 8 transistor outputs

• Digital Output Voltage: 24 V DC

• Maximum Rated Output Current: 0.5 A per output under specified conditions

• Program/Data Memory: 20 KB

• Programming Software: STEP 7 Micro/WIN SMART

• Communication Interfaces: 1 Ethernet interface and 1 RS-485 interface

• Ethernet Connector: RJ45

• High-Speed Pulse Outputs: 3, with supported functions depending on configuration

• High-Speed Counter Functions: Supported

• PID Control: Supported

• Mounting Type: Standard DIN rail

• Protection Rating: IP20

• Dimensions (W × H × D): Approximately 90 × 100 × 81 mm

• Approximate Weight: 320 g

• Main Application: Industrial automation and machine control

Key Features and Benefits:

1. Compact PLC Design: Provides programmable control and integrated digital I/O for compact industrial automation systems.

2. 12 Digital Inputs: Accepts compatible 24 V DC signals from sensors, switches, push buttons, and other digital field devices.

3. 8 Transistor Outputs: Controls compatible 24 V DC electronic loads and automation interfaces within the specified output ratings.

4. 24 V DC Power Supply: Operates within a 20.4–28.8 V DC supply range, making it suitable for compatible industrial control panels.

5. PLC Programming Support: Uses STEP 7 Micro/WIN SMART software for program development, troubleshooting, and maintenance.

6. Ethernet and RS-485 Communication: Supports connections with compatible automation equipment and industrial communication systems.

7. High-Speed Control Functions: Provides supported high-speed counting and pulse output functions for compatible motion and counting applications.

8. Industrial Process Control: Supports programmed sequencing, digital signal monitoring, machine interlocks, and automated operating logic.

9. DIN Rail Mounting: Designed for installation inside a compatible industrial control cabinet.

10. Flexible Automation Applications: Suitable for packaging equipment, conveyor systems, manufacturing machinery, and production-line control.

Applications:

• Industrial machine automation

• Manufacturing and assembly lines

• Packaging and filling machinery

• Conveyor belt control systems

• Automated production equipment

• Material-handling systems

• Industrial control panels

• Digital sensor monitoring

• High-speed counting applications

• Pulse-based control applications

• Machine sequencing and interlocking

• PID-based process control

• OEM machinery and equipment

• Factory automation and industrial process control

Installation and Compatibility: Before purchasing or installing the Siemens 6ES7288-1ST20-0AA0 PLC, verify the part number, supply voltage, digital input wiring, transistor output load requirements, communication protocols, firmware compatibility, and PLC program requirements. Transistor outputs must be connected only to compatible loads within the manufacturer's electrical ratings. This model requires a suitable 24 V DC supply and is not designed for direct 120 V AC or 230 V AC power input. Installation, wiring, commissioning, and maintenance should be performed by qualified personnel in accordance with Siemens documentation and applicable electrical safety standards.