Siemens 6ES7288-1SR40-0AA0 CPU SR40 AC/DC/Relay | Replacement, Equivalent & Selection Guide
The Siemens 6ES7288-1SR40-0AA0 is a high-performance CPU module in the S7-200 SMART series, featuring 24 digital inputs, 16 relay outputs, AC power supply, and an onboard Ethernet port. This page provides full technical specifications, compatible replacement models, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Part Number: 6ES7288-1SR40-0AA0
- Series: SIMATIC S7-200 SMART
- CPU Type: SR40 (Standard, Relay Output)
- Power Supply: AC 85–264 V
- Digital Inputs: 24 × DC 24 V
- Digital Outputs: 16 × Relay, 2 A per point
- Program Memory: 24 KB
- Data Memory: 10 KB
- Onboard Communication: 1 × Ethernet (PROFINET-compatible), 1 × RS-485
- Expansion Modules: Up to 6
- Signal Board: 1 supported
- High-Speed Counters: 4 × 200 kHz
- Pulse Outputs: 3 × 100 kHz (transistor models only; relay model supports motion via SB)
- Real-Time Clock: Yes (built-in)
- Operating Temperature: 0–55 °C
- Dimensions (W×H×D): 210 × 100 × 81 mm
- Weight: ~480 g
- Protection Rating: IP20
- Certifications: CE, UL, cULus
Compatible Replacement & Equivalent Models
The table below lists direct and functional equivalents for the 6ES7288-1SR40-0AA0 to support cross-referencing and alternative sourcing:
- Siemens 6ES7288-1ST40-0AA0 – Same I/O count (24 DI / 16 DO), transistor output variant; suitable when high-speed pulse output is required
- Siemens 6ES7288-1SR30-0AA0 – Smaller SR30 CPU (18 DI / 12 DO relay); use when I/O count can be reduced
- Siemens 6ES7288-1SR60-0AA0 – Larger SR60 CPU (36 DI / 24 DO relay); use when additional I/O is needed without expansion modules
- Siemens 6ES7212-1BE40-0XB0 – S7-1200 CPU 1212C; next-generation platform with TIA Portal programming, suitable for new designs requiring scalability
- Siemens 6ES7214-1BG40-0XB0 – S7-1200 CPU 1214C; direct functional upgrade path with expanded memory and PROFINET
Note: Always verify I/O type (relay vs. transistor), power supply voltage, and firmware compatibility before substituting modules in existing systems.
Why Choose the Original Model
- Proven reliability in millions of installed S7-200 SMART applications worldwide
- Native STEP 7-Micro/WIN SMART programming environment — no migration required
- Relay outputs provide galvanic isolation, ideal for mixed-voltage load switching
- Integrated Ethernet eliminates the need for a separate CP module
- Broad expansion ecosystem: analog, temperature, positioning, and communication modules
- Long-term spare parts availability through authorized Siemens distribution channels
Typical Applications
- Packaging machinery and conveyor control
- HVAC and building automation systems
- Water treatment and pump station control
- Textile and printing equipment
- Small-scale process control and OEM machine builders
- Retrofit and upgrade of legacy S7-200 (6ES7 21x) installations
System Compatibility
- Programming Software: STEP 7-Micro/WIN SMART V2.4 and above
- HMI: Siemens SMART LINE panels (e.g., SMART 700 IE V3), KTP series via Ethernet
- Expansion Modules: 6ES7288-2 series (digital), 6ES7288-3 series (analog), 6ES7288-5 series (communication)
- Signal Board: 6ES7288-5BA01-0AA0 (AQ), 6ES7288-5CD01-0AA0 (AI/AQ)
- Communication: Modbus RTU/TCP, USS protocol, S7 communication via Ethernet
Selection Guide
Use the following criteria to select the correct CPU for your application:
- I/O Count: SR40 provides 24 DI + 16 DO. If you need fewer I/O points, consider SR20 or SR30. For more, consider SR60 or add expansion modules.
- Output Type: Choose Relay (SR) for mixed-voltage or inductive loads; choose Transistor (ST) for high-speed pulse output or servo/stepper control.
- Power Supply: SR40 uses AC supply (85–264 V). For DC-powered panels, select the ST40 (DC/DC/Transistor) variant.
- Future Scalability: If the project may migrate to TIA Portal or require advanced motion/safety, consider S7-1200 (CPU 1214C) as the upgrade path.
- Environment: Confirm operating temperature range and enclosure IP rating match site conditions.
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels
- Each module inspected for physical integrity, label authenticity, and firmware version prior to shipment
- Original factory packaging preserved where available
- Traceability documentation available upon request for MRO and OEM customers
- Warranty: 12 months from date of shipment against manufacturing defects
How to Order
- Part Number: 6ES7288-1SR40-0AA0
- Quantity: Single unit or bulk orders accepted
- Lead Time: In-stock items ship within 1–3 business days; contact us for large-quantity lead times
- Payment: T/T, PayPal, credit card, and trade terms available for qualified accounts
- Shipping: DHL, FedEx, UPS worldwide; sea freight available for bulk orders
- Add to cart directly, or contact support@konmask.com for a formal quotation
Replacement & Compatibility FAQ
Q: Can I replace a 6ES7288-1SR40-0AA0 with a 6ES7288-1ST40-0AA0?
A: Yes, the ST40 is pin-compatible and has the same I/O count, but uses transistor outputs (DC 24 V, 0.75 A). Verify your load voltage and type before substituting.
Q: Is the 6ES7288-1SR40-0AA0 compatible with S7-200 (classic) programs?
A: Not directly. S7-200 SMART uses STEP 7-Micro/WIN SMART, which requires program migration from the classic STEP 7-Micro/WIN environment. Most instruction sets are compatible but must be re-compiled.
Q: What is the upgrade path from S7-200 SMART to S7-1200?
A: Siemens provides a migration guide via TIA Portal. The CPU 1214C (6ES7214-1BG40-0XB0) is the recommended functional equivalent with expanded capabilities.
Q: Can I use third-party expansion modules with this CPU?
A: No. The S7-200 SMART expansion bus is proprietary. Only Siemens 6ES7288-2/3/5 series modules are supported.
Q: What is the difference between SR and ST variants?
A: SR = Standard Relay output (AC/DC loads, galvanic isolation). ST = Standard Transistor output (DC loads only, high-speed pulse capable).
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