PLC ST20 DC/DC/DC

The Siemens SIMATIC S7-200 SMART CPU ST20, part number 6ES7-288-1ST20-0AA0, is a compact and cost-effective programmable logic controller (PLC) designed for basic automation tasks. It is suitable for small machines and process control applications where reliability and flexibility are required.

Key Features and Specifications

• Model: S7-200 SMART CPU ST20 (6ES7-288-1ST20-0AA0)

• Power Supply: DC 20.4–28.8 V

• Digital Inputs: 12 x 24V DC

• Digital Outputs: 8 x 24V DC (transistor outputs)

• Program/Data Memory: 12 KB program memory, 8 KB data memory

• Interfaces:

  • 1 x Ethernet/PROFINET port (RJ45) for programming and networking

  • 1 x RS485 port supporting Modbus RTU/USS Master/Slave communication

• Mounting: DIN rail

• Dimensions: 90 x 100 x 81 mm

• Expandability: Supports signal boards (SBs) for limited I/O expansion

• Programming Software: STEP 7 MicroWIN SMART

• Processing Speed: 0.15 µs per bit operation

• Integrated Functions: PID control (up to 8 loops), high-speed counters (4 HSC at 200 kHz or 2 HSC at 100 kHz for A/B phase), support for microSDHC card for program/firmware updates

• Application Areas: Basic machine control, small conveyors, lighting control, and simple process automation

Benefits

• Affordable and Compact: Ideal for entry-level automation projects with limited space and budget

• Integrated Communication: Ethernet and RS-485 ports for flexible networking and device integration

• User-Friendly: Easy programming with STEP 7 MicroWIN SMART and support for SD card updates

• Reliable Performance: Fast processing and robust Siemens quality