| Product Type Designation | CPU ST40 DC/DC/DC |
|---|---|
| Order Number | 6ES7288-1ST40-0AA0 |
| Programming Package | STEP 7 Micro/WIN SMART |
| Installation Type | STEP 7 Micro/WIN SMART |
| Type of Supply Voltage | 24 V DC |
|---|---|
| Permissible Range Lower Limit | 20.4 V DC |
| Permissible Range Upper Limit | 28.8 V DC |
| Input Current Max | 680 mA (24 V DC) |
| Inrush Current Max | 11.7 A (at 28.8 V) |
| 24 V DC Sensor Power Max Output | 300 mA |
| 5 V DC Backplane Bus Max Output | 1.4 A |
| Power Loss Max | 18 W |
| Type of Memory | DDR (Flash and RAM) |
|---|---|
| User Data Memory | 16 kbyte |
| Program Memory Size | 24 kbyte |
| Micro Memory Card Support | Yes (microSDHC Card optional) |
| Bit Operations Typ | 150 ns/instruction |
|---|---|
| Word Operations Typ | 1.2 µs/instruction |
| Floating Point Arithmetic Typ | 3.6 µs/instruction |
| Digital Inputs Address Area | 144 byte (256 bit) |
|---|---|
| Digital Outputs Address Area | 144 byte (256 bit) |
| Analog Inputs Address Area | 56 words |
| Analog Outputs Address Area | 56 words |
| Type | Hardware clock (no battery backup) |
|---|---|
| Real-time Clock | Yes |
| Backup Time | 7 days |
| Max Deviation per Day | 4 s (within 120s/month at 25 °C) |
| Number of Digital Inputs | 24 |
|---|---|
| Input Voltage Type | DC |
| Rated Value | 24 V DC |
| Signal "0" Threshold | I0.0 to I0.3 < 1 V DC; I0.4 to I2.7 < 5 V DC |
| Signal "1" Threshold | I0.0 to I0.3 > 4V; I0.4 to I2.7 > 15V |
| Signal "1" Current Typ | 4 mA |
| Max Shielded Cable Length | 500 m (50m shielded for HSC inputs) |
| Max Unshielded Cable Length | 300 m |
| Number of Digital Outputs | 16 (Transistor) |
|---|---|
| Number of High-speed Outputs | 3 |
| Short-circuit Protection | No |
| Max Resistive Load per Output | 0.5 A |
| Max Lamp Load per Output | 5 W |
| Max Shielded Cable Length | 500 m |
| Max Unshielded Cable Length | 150 m |
| Number of Industrial Ethernet Interfaces | 1 |
|---|---|
| Number of RS 485 Interfaces | 1 |
| Physics | RJ45 |
|---|---|
| Isolation | Transformer isolated (1,500V AC) |
| Transmission Rate | 10/100 Mbit/s (automatic detection) |
| Autonegotiation | Yes |
| Autocrossing | Yes |
| Max Baud Rate | 187.5 kbit/s |
|---|
| S7 Communication Supported | Yes (as server and client) |
|---|
| Number of High-speed Counters | 4 (4 HSC at 200 kHz single phase or 2 HSC at 100 kHz A/B phase) |
|---|---|
| PID Controller | Yes (max 8 loops, continuous/binary outputs, auto/manual mode) |
| Electrostatic Discharge Immunity | IEC 61000-4-2 (8 kV air discharge) |
|---|---|
| Radio Frequency Immunity | IEC 61000-4-3 (10 V/m, 80 to 1000 MHz) |
| Electrical Fast Transient Immunity | IEC 61000-4-4 (2 kV supply lines, ±2 kV signal cables) |
| Conducted Immunity | IEC 61000-4-6 (10 V, 150 kHz to 80 MHz) |
| Interference Emission | EN 55 011 Class A (industrial areas), EN 61000-6-4 |
| IP Rating | IP20 (EN 60529) |
|---|
| CE Mark | Yes |
|---|
| Max Free Fall Height | 0.3 m (five times in product package) |
|---|---|
| Operating Temperature Min | 0 °C |
| Operating Temperature Max | 55 °C (horizontal), 45 °C (vertical) |
| Storage/Transport Temperature Min | -40 °C |
| Storage/Transport Temperature Max | 70 °C |
| Storage/Transport Air Pressure Range | 660 to 1080 hPa |
| Installation Altitude Range | -1000 m to 2000 m (sea level) |
| Max Relative Humidity (25°C, no condensation) | 95% |
| LAD (Ladder Diagram) | Yes |
|---|---|
| FBD (Function Block Diagram) | Yes |
| STL (Statement List) | Yes |
| Width | 125 mm |
|---|---|
| Height | 100 mm |
| Depth | 81 mm |
| Approximate Weight | 410.3 g |
|---|