Siemens 6ES7288‑1ST20‑0AA0 SIMATIC S7‑200 SMART CPU ST20

1. Product Overview

The 6ES7288‑1ST20‑0AA0 is a standard DC‑powered CPU of Siemens SIMATIC S7‑200 SMART series, DC/DC/DC type with transistor outputs. Equipped with integrated Ethernet and RS485 communication ports, it delivers reliable compact control for small‑to‑medium automation projects. This unit has 12‑point DC digital inputs and 8‑point DC transistor outputs onboard, supporting module expansion for flexible I/O configuration. It is widely deployed in machinery, packaging equipment, conveyor systems and small production lines. Note: This part is discontinued by Siemens, successor model: 6ES7288‑1ST20‑0AA1.

2. Core Advantages & Key Features

• ✅ On‑board I/O: 12 x 24V‑DC digital inputs, 8 x 24V‑DC transistor outputs
• ✅ Dual communication: Integrated Ethernet port + RS485 interface, supports Modbus TCP, Modbus RTU, TCP/IP protocol
• ✅ Program/data memory: 20 KB, supports Micro‑SD card for program backup, download and firmware update
• ✅ High‑speed counter & pulse output: Supports high‑speed counting and pulse output for simple motion control tasks
• ✅ DC power supply: 20.4‑28.8 V DC, DIN‑rail mounting design, compact cabinet installation
• ✅ Supports external expansion modules and signal boards to extend digital & analog I/O capacity

3. Technical Specifications

4. Application Fields

Small‑size machinery, packaging machines, conveyor equipment, pumping systems, HVAC equipment, automated assembly lines, and general factory automation retrofitting projects.

5. Package & Warranty

• Package: Original individual packing
• Warranty: 12‑month warranty