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Siemens S7-200 SMART CPU SR20 6ES7288-1SR20-0AA0 PLC
Siemens S7-200 SMART、CPU SR20、6ES7288-1SR20-0AA0、Siemens PLC、S7-200 SMART PLC、AC/DC/Relay PLC
Siemens SIMATIC S7-200 SMART CPU SR20 6ES7288-1SR20-0AA0 AC/DC/Relay PLC
Model: CPU SR20
Part Number: 6ES7288-1SR20-0AA0
Series: SIMATIC S7-200 SMART
Product Type: Programmable Logic Controller (PLC)
Power Supply: AC
Digital Inputs: 12 DI, 24 V DC
Digital Outputs: 8 Relay Outputs
Output Rating: Up to 2 A
Programming Software: STEP 7 Micro/WIN SMART
Product Overview
The Siemens SIMATIC S7-200 SMART CPU SR20 6ES7288-1SR20-0AA0 is a compact programmable logic controller designed for small and medium-sized industrial automation systems.
Featuring 12 integrated 24 V DC digital inputs and 8 relay outputs, the CPU SR20 provides a practical control solution for machines, production equipment, control cabinets and process automation applications.
Its integrated communication capabilities and expandable S7-200 SMART architecture make it suitable for both standalone machine control and networked automation systems.
For customers maintaining existing S7-200 SMART installations, the 6ES7288-1SR20-0AA0 is also commonly required as a replacement or spare PLC CPU.
Key Features
12 Digital Inputs
The CPU SR20 includes 12 onboard 24 V DC digital input channels, allowing connection to sensors, switches and other field input devices.
8 Relay Outputs
Eight integrated relay outputs provide flexible switching for contactors, relays, indicators, solenoid valves and other industrial loads.
AC Power Supply
The controller supports a wide AC input range, making it suitable for common industrial electrical control systems.
Integrated Ethernet Communication
Built-in industrial Ethernet communication allows the PLC to communicate with compatible automation devices and engineering systems.
RS485 Communication
The integrated RS485 interface supports communication with compatible industrial devices and serial communication networks.
Compact PLC Design
The compact CPU combines processing, onboard I/O and communication capabilities in a space-efficient enclosure suitable for electrical control cabinets.
Expandable S7-200 SMART Platform
The S7-200 SMART platform supports additional expansion modules for applications requiring more digital, analog or communication I/O.
Technical Specifications
Specification | Details |
|---|---|
Manufacturer | Siemens |
Product Family | SIMATIC S7-200 SMART |
CPU Model | CPU SR20 |
Order Number | 6ES7288-1SR20-0AA0 |
Product Type | PLC CPU |
Supply Type | AC |
Supply Voltage | 85–264 V AC |
Supply Frequency | 47–63 Hz |
Digital Inputs | 12 |
Digital Input Voltage | 24 V DC |
Digital Outputs | 8 |
Output Type | Relay |
Relay Output Capacity | Up to 2 A |
Program Memory | 12 KB |
Data Memory | 8 KB |
Total Program/Data Memory | 20 KB |
Ethernet Interface | 1 |
Ethernet Speed | 10/100 Mbps |
RS485 Interface | 1 |
Programming Software | STEP 7 Micro/WIN SMART |
High-Speed Counters | Supported |
PID Control | Supported |
Memory Card | Optional microSDHC |
Protection Rating | IP20 |
Mounting | DIN Rail |
Approx. Dimensions | 90 × 100 × 81 mm |
Approx. Weight | 367 g |
Communication Interfaces
The Siemens CPU SR20 provides multiple communication options for machine automation and system integration.
Industrial Ethernet
The integrated Ethernet interface supports industrial network communication and can be used to connect compatible PLCs, HMIs, engineering computers and automation devices.
Key capabilities include:
- 10/100 Mbps Ethernet
- TCP/IP communication
- S7 communication
- PROFINET communication depending on firmware version
- Automatic transmission-rate detection
- RJ45 connection
RS485
An integrated RS485 interface provides additional connectivity for serial industrial communication.
This is useful for applications involving compatible HMIs, variable-frequency drives, instruments and other automation equipment.
Digital Input & Output Configuration
Digital Inputs
The CPU SR20 provides:
12 × 24 V DC digital inputs
The inputs can be used with industrial field devices such as:
- Push buttons
- Limit switches
- Proximity sensors
- Photoelectric sensors
- Pressure switches
- Level switches
- Machine status signals
Selected inputs also support high-speed counting functions.
Relay Outputs
The controller includes:
8 × relay digital outputs
Relay outputs are suitable for controlling:
- Contactors
- Intermediate relays
- Indicator lamps
- Buzzers
- Solenoid valves
- Small electrical loads
- Machine control circuits
Typical Applications
The S7-200 SMART CPU SR20 is suitable for a wide variety of industrial automation applications.
Typical applications include:
- Packaging machinery
- Conveyor systems
- Pump control
- Fan control systems
- Water treatment equipment
- Material handling systems
- Small production machines
- Industrial control panels
- Building automation
- Filling machines
- Textile equipment
- Food processing machinery
- HVAC control
- OEM machinery
- Retrofit automation projects
Why Choose the S7-200 SMART CPU SR20?
Compact Control Solution
Integrated CPU, I/O and communication capabilities reduce control-panel space and simplify system design.
Flexible I/O
The combination of digital inputs and relay outputs covers many common machine-control requirements.
Industrial Communication
Ethernet and RS485 interfaces provide flexible options for connecting automation equipment.
Easy System Expansion
Compatible S7-200 SMART expansion modules can be used when additional I/O or communication functions are required.
Suitable for Existing Installations
The 6ES7288-1SR20-0AA0 is particularly useful for users maintaining or repairing existing S7-200 SMART control systems.
6ES7288-1SR20-0AA0 Replacement Information
The 6ES7288-1SR20-0AA0 is a legacy S7-200 SMART CPU SR20 order number.
Siemens lists:
Original Part Number:
6ES7288-1SR20-0AA0
Successor Part Number:
6ES7288-1SR20-0AA1
If you are replacing an existing CPU, please send us:
- Existing PLC model
- Full part number
- PLC nameplate photo
- Required quantity
- Destination country
Our team can help check the requested model and available replacement options.
[Ask About Replacement]
Compatible Product Categories
The CPU SR20 can be used as part of a complete industrial automation system together with compatible:
- S7-200 SMART expansion modules
- Human Machine Interfaces (HMI)
- Variable Frequency Drives (VFD)
- Servo drives
- Industrial power supplies
- Sensors
- Relays
- Contactors
- Industrial Ethernet devices
- Control cabinets
Ordering Information
Product: Siemens SIMATIC S7-200 SMART CPU SR20
Part Number: 6ES7288-1SR20-0AA0
Configuration: AC/DC/Relay
Quantity: Contact us for availability
Shipping: Worldwide shipping available
Quotation: Available on request
For accurate quotation and delivery information, please provide:
- Part number
- Required quantity
- Destination country
- Required delivery time
Frequently Asked Questions
What is 6ES7288-1SR20-0AA0?
6ES7288-1SR20-0AA0 is the Siemens order number for a SIMATIC S7-200 SMART CPU SR20 AC/DC/Relay PLC.
How many inputs and outputs does CPU SR20 have?
The CPU SR20 has 12 onboard 24 V DC digital inputs and 8 relay digital outputs.
What type of output does the SR20 use?
The SR20 uses relay outputs.
If your application requires transistor outputs, check the appropriate S7-200 SMART ST-series CPU.
What power supply does the CPU SR20 use?
The 6ES7288-1SR20-0AA0 operates from an 85–264 V AC power supply at 47–63 Hz.
Which software is used to program S7-200 SMART?
S7-200 SMART CPUs are programmed using STEP 7 Micro/WIN SMART.
Does CPU SR20 support Ethernet?
Yes. CPU SR20 includes an integrated industrial Ethernet interface.
Does the CPU SR20 have RS485?
Yes. The CPU includes an integrated RS485 communication interface.
Is 6ES7288-1SR20-0AA0 discontinued?
The 6ES7288-1SR20-0AA0 is a legacy order number that Siemens lists for limited spare-part supply.
The successor model is 6ES7288-1SR20-0AA1.
Contact us if you need help identifying a compatible replacement.
Can I use this PLC as a replacement for an existing CPU SR20?
It may be suitable when replacing the same model in an existing installation. Before ordering, confirm the complete order number, hardware configuration, firmware and application requirements.
Do you supply S7-200 SMART expansion modules?
Yes. Compatible digital I/O, analog I/O and communication modules can be supplied depending on availability.
Contact us with your required Siemens part numbers.
Need Siemens S7-200 SMART Parts?
Looking for an S7-200 SMART PLC, HMI, expansion module or replacement automation component?
Send us your part number or BOM list for quotation.
We can help with:
- PLC CPUs
- Digital I/O modules
- Analog I/O modules
- Communication modules
- HMIs
- Variable frequency drives
- Servo products
- Industrial automation components
Send your part number and required quantity today.
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