The Siemens SIMATIC S7-200 SMART CPU SR40 (6ES7288-1SR40-0AA0) is a compact and reliable Standard PLC Controller designed for small and medium-sized industrial automation applications. Featuring 24 digital inputs and 16 relay outputs, this CPU provides 40 onboard digital I/O points for efficient machine control and process automation.

The CPU SR40 features 40 KB of total program and data memory, comprising 24 KB of program memory and 16 KB of user data memory. It operates on an AC power supply ranging from 85 to 264 V and supports STEP 7 Micro/WIN SMART programming software.

With integrated Ethernet and RS-485 communication interfaces, high-speed counters, PID control, pulse outputs, and support for expansion modules, the Siemens CPU SR40 offers flexible integration into industrial control systems. Its DIN rail mounting and expandable architecture make it suitable for OEM machinery and factory automation.

Typical applications include packaging machines, textile machinery, conveyors, pumps, compressors, food processing equipment, water treatment systems, and industrial production lines.

Technical Specifications

• Brand: Siemens

• Product Family: SIMATIC S7-200 SMART

• Model: CPU SR40

• Part Number: 6ES7288-1SR40-0AA0

• Product Type: Standard PLC Controller

• CPU Type: AC/DC/Relay

• Digital Inputs: 24 DI, 24 V DC

• Digital Outputs: 16 Relay Outputs

• Relay Switching Capacity: 2 A

• Total Onboard I/O: 40 points

• Program Memory: 24 KB

• User Data Memory: 16 KB

• Total Program/Data Memory: 40 KB

• Power Supply: AC 85–264 V

• Supply Frequency: 47–63 Hz

• Ethernet Interface: 1 × Industrial Ethernet (RJ45)

• RS-485 Interface: 1

• Communication: TCP/IP, S7 Communication, PROFINET

• Programming Software: STEP 7 Micro/WIN SMART

• High-Speed Counters: Supported

• PID Control: Supported

• Real-Time Clock: Built-in

• Expansion: Supports S7-200 SMART expansion modules

• Memory Card: Optional microSDHC

• Mounting: Standard DIN Rail

• Protection Rating: IP20

• Dimensions (W × H × D): 125 × 100 × 81 mm

• Weight: Approximately 441 g

• Maximum Power Loss: 23 W

• Applications: Machine Automation, Packaging, Textile Machinery, Conveyors, Pumps, Compressors, Food Processing, Water Treatment, Factory Automation