The Siemens SIMATIC S7-200 SMART CPU SR20 (6ES7288-1SR20-0AA1) is a compact and expandable Standard PLC Controller designed for small and medium-sized industrial automation applications. The CPU features 12 digital inputs and 8 relay outputs, providing 20 onboard digital I/O points for reliable machine and process control.

The CPU SR20 supports AC 85–264 V power supply and includes integrated Ethernet/PROFINET communication and RS-485 connectivity. It is compatible with Siemens STEP 7-Micro/WIN SMART programming software and supports a wide range of automation functions for machine builders, OEM equipment, and factory automation systems.

The 6ES7288-1SR20-0AA1 is the updated S7-200 SMART CPU SR20 version supporting newer firmware features. Siemens documentation identifies this article number as one of the CPU models supporting firmware V2.7 features, including enhanced memory ranges, additional PWM functionality, and security enhancements.

Technical Specifications:

• Brand: Siemens
• Product Family: SIMATIC S7-200 SMART
• Model: CPU SR20
• Part Number: 6ES7288-1SR20-0AA1
• Product Type: Standard PLC Controller
• CPU Type: AC/DC/Relay
• Digital Inputs: 12 DI, 24 V DC
• Digital Outputs: 8 Relay Outputs, 2 A
• Total Onboard I/O: 20 points
• Program Memory: 12 KB
• Data Memory: 8 KB
• Power Supply: AC 85–264 V, 47–63 Hz
• DC Supply Range: 77–138 V DC
• Ethernet/PROFINET: Built-in
• RS-485 Interface: Built-in
• Programming Software: STEP 7-Micro/WIN SMART
• Expansion: Supports S7-200 SMART expansion modules
• Mounting: DIN Rail
• Protection Rating: IP20
• Operating Temperature: 0°C to +55°C
• Dimensions (W × H × D): 90 × 100 × 81 mm
• Weight: Approximately 0.37 kg
• Typical Applications: Machine Automation, Packaging Machines, Textile Machinery, Conveyors, Pumps, Compressors, Food Processing, Water Treatment and Factory Automation