Product Description
Product Overview
| Parameter | Details |
|---|---|
| Part Number | 6ES7288-1ST20-0AA0 |
| Product Name | SIMATIC S7-200 SMART CPU ST20 |
| Application | Compact, high-performance PLC for small to medium automation tasks: machine control, packaging, HVAC, water treatment, conveyor systems |
| Compatibility | S7-200 SMART family; supports up to 6 expansion modules; TIA Portal V15+ programming; PROFINET, Modbus TCP, USS, OPC UA |
| Function | Integrated CPU with onboard transistor (PNP) digital I/O, high-speed counters, pulse outputs (PTO/PWM), and Ethernet communication |
Functional Specifications
| Parameter | Details |
|---|---|
| Processor | 32-bit RISC, 0.08 µs per instruction |
| Program Memory | 20 KB (user program) |
| Data Memory | 10 KB (retainable: 10 KB with battery backup) |
| Onboard Digital I/O | 12 DI (24 V DC, sink/source) 8 DO (24 V DC, 0.5 A, transistor PNP) |
| High-Speed Counters | 4 _ 100 kHz (A/B phase, single-phase up to 200 kHz) |
| Pulse Outputs (PTO/PWM) | 2 _ 100 kHz (PTO for motion), 2 _ 100 kHz (PWM) |
| Supply Voltage | 20.4 _ 28.8 V DC (24 V DC nominal) |
| Power Consumption | 8 W typical (without expansion) |
| Inrush Current | Max 12 A @ 28.8 V DC |
| Communication | 1 _ Ethernet (10/100 Mbps) _ PROFINET RT, Modbus TCP, S7 comm, OPC UA server |
| Expansion | Up to 6 SM/EM modules (digital, analog, comm) |
| Real-Time Clock | Yes (battery-backed, _ 10 days retention) |
| Battery Backup | Optional CR2032 _ retains data/clock during power loss |
| Operating Temperature | 0°C to +60°C (horizontal); _20°C to +60°C (vertical, derating) |
| Storage Temperature | _40°C to +70°C |
| Dimensions (W_H_D) | 90 mm _ 100 mm _ 81 mm |
| Weight | 0.37 kg (0.82 lbs) |
| Mounting | 35 mm DIN rail or panel mount (with screws) |
| Connectors | Removable screw terminals (1.5 mm² max) |
| LED Indicators | PWR (green), RUN/STOP (green/red), SF (red), LINK/ACT (green) |
| Certifications | CE, UL, cULus, CSA, RCM, KC, FM Class I Div 2, ATEX Zone 2 |
| Standards Compliance | IEC 61131-2, EN 61000-6-2/4 (EMC), UL 508, CSA C22.2 |
Ordering Information
| Parameter | Details |
|---|---|
| Part Number Configuration | 6ES7288-1ST20-0AA0 (ST20, DC/DC/Transistor, 12 DI/8 DO, 20 KB) |
| Replaces / Supersedes | 6ES7288-1ST20-0AA1 (adds OPC UA, faster Ethernet, TIA V16+ support) |
| Available Variants | _ 6ES7288-1ST30-0AA0: 18 DI/12 DO, 30 KB _ 6ES7288-1SR20-0AA0: Relay outputs _ 6ES7288-1CR20-0AA0: Compact version (no expansion) |
| Accessories | _ 6ES7290-1AA00-0XA0: 24 V DC power connector _ 6ES7901-3CB30-0XA0: Ethernet patch cable _ 6EP1332-1SH71: 24 V power supply |
| Programming | TIA Portal V15.1+ or STEP 7 Basic (free download) |
Key Features & Compatibility Notes
| Feature | Benefit / Upgrade Path |
|---|---|
| Transistor Outputs (0.5 A) | Direct drive of solenoids, small valves, LEDs _ no interposing relay |
| High-Speed I/O | Motion control (stepper/servo via PTO), encoder feedback, PWM dimming |
| Built-in Ethernet | PROFINET RT, Modbus TCP, Web server, remote access |
| TIA Portal Integration | Drag-and-drop programming, online diagnostics, HMI connectivity |
| Backward Compatible | Replaces S7-200 (CN) series _ same footprint, enhanced performance |
| Battery Option | Data retention during power failure _ ideal for critical processes |