The Siemens S7-200 SMART CPU SR40 AC/DC/RLY is a compact, high-performance PLC designed for industrial automation, machine control, OEM equipment, process automation, pump control, water treatment, packaging, and factory automation applications. It provides 24 digital inputs, 16 relay outputs, built-in Ethernet and RS485 communication, high-speed counting, pulse functions, flexible expansion, and powerful program/data memory.
| Feature | CPU SR40 AC/DC/RLY |
|---|---|
| Product Family | Siemens S7-200 SMART |
| Order Number (MLFB) | 6ES7 288-1SR40-0AA0 |
| Power Supply | 85–264 VAC, 47–63 Hz |
| Digital Inputs | 24 DI, 24 VDC |
| Digital Outputs | 16 Relay Outputs |
| Ethernet Port | Built-in 10/100 Mbps |
| RS485 Port | 1 Built-in |
| Optional Port | RS232/RS485 Signal Board |
| Program Memory | 24 KB |
| Data Memory | 16 KB |
| Retentive Memory | Up to 10 KB |
| Expansion Modules | Up to 6 |
| Signal Board | Up to 1 |
| Dimensions | 125 × 100 × 81 mm |
| Weight | Approx. 441.3 g |
| Power Consumption | 23 W |
Siemens lists the SR40 as having 24 digital inputs and 16 relay outputs, with 85–264 VAC supply and 2 A relay outputs.
The SR40 is also included among S7-200 SMART CPUs supporting newer firmware functionality such as PROFINET in the applicable V2.4 platform.
| Specification | Value |
|---|---|
| Program Memory | 24 KB |
| Data Memory | 16 KB |
| Retentive Memory | Up to 10 KB |
| Bit Memory | 256 Bits |
| Process Image Inputs | 256 Bits |
| Process Image Outputs | 256 Bits |
| Analog Image Inputs | 56 Words |
| Analog Image Outputs | 56 Words |
| Local Memory | 64 Bytes per program/subroutine/interrupt |
The standard SR40 documentation specifies 24 KB program memory, 16 KB data memory, and up to 10 KB retentive memory.
The CPU SR40 provides 24 integrated 24 VDC digital inputs for connection to industrial sensors, switches, push buttons, proximity sensors, limit switches and other digital devices.
The SR40 uses relay-type digital outputs, making it suitable for controlling contactors, solenoid valves, relays, lamps, motor starters and other AC/DC loads.
Siemens specifies the SR40's onboard outputs as 16 relay digital outputs rated at 2 A.
| Function | Specification |
|---|---|
| High-Speed Counters | Up to 6 |
| Single Phase | 4 × 200 kHz + 2 × 30 kHz |
| Quadrature | 2 × 100 kHz + 2 × 20 kHz |
| Pulse Outputs | Up to 3 × 100 kHz* |
| Pulse Capture Inputs | Up to 14 |
| Cycle Interrupt | 2 |
| Cycle Interrupt Resolution | 1 ms |
| Edge Interrupt | 4 Rising + 4 Falling |
*High-speed pulse-output capability is associated with transistor-output/high-speed-output functions; the SR40's 16 onboard outputs are relay outputs, so pulse/motion-output application should be checked against the selected hardware configuration. Siemens documentation lists these CPU-level high-speed functions for the SR40 family.
| Feature | Specification |
|---|---|
| Ethernet | 10/100 Mbps |
| Serial Communication | RS485 |
| Optional Serial Port | RS232 / RS485 |
| HMI Communication | Supported |
| SCADA Communication | Supported |
| GET/PUT Communication | Supported |
| Open Ethernet Communication | Supported |
| PROFINET | Supported with applicable firmware/version |
| Programming | Ethernet / RS485 |
The S7-200 SMART platform provides Ethernet and RS485 communication resources, including HMI, GET/PUT and open Ethernet communication functions.
The Siemens S7-200 SMART CPU SR40 can be expanded to accommodate larger automation systems.
This makes the SR40 suitable for systems requiring more I/O than the CPU's onboard 24 DI / 16 DO configuration.
The CPU includes an integrated Real-Time Clock for time-based automation functions.
Typical applications include:
Siemens specifies 85–264 VAC input operation and approximately 23 W power consumption for the SR40.
The CPU provides an integrated 24 VDC sensor supply.
| Specification | Value |
|---|---|
| Dimensions | 125 × 100 × 81 mm |
| Weight | Approx. 441.3 g |
| Supply Type | AC |
| Digital Input Type | 24 VDC |
| Output Type | Relay |
| Mounting | DIN Rail |
| Expansion | Up to 6 modules |
| Signal Board | 1 |
Siemens documentation specifies the SR40 dimensions as 125 × 100 × 81 mm and weight at approximately 441.3 g.
The Siemens S7-200 SMART CPU SR40 can be programmed using:
The S7-200 SMART V2.4 platform also introduced PROFINET communication functionality for supported CPU models and firmware.
The Siemens S7-200 SMART CPU SR40 is suitable for:
A typical SR40-based automation system can include:
Sensors → S7-200 SMART SR40 → VFD / Motor / Valve / Contactor → HMI → Ethernet/SCADA
The PLC can collect digital field signals, execute control logic, communicate with drives and HMIs, and exchange data with supervisory systems through its communication interfaces.
Order Number: 6ES7 288-1SR40-0AA0
Siemens now lists 6ES7 288-1SR40-0AA1 as a later SR40 version/product successor to 6ES7 288-1SR40-0AA0 in some markets. Therefore, check the specifications and firmware/version against the exact MLFB being purchased.
Login Or Registerto submit your questions to seller
No none asked to seller yet
At Tech Lab Bangladesh Engineering, we are dedicated to transforming industries through cutting-edge
automation solutions. Tech Lab Bangladesh Engineering Has
Expert team to provide Efficient and Economic Solution.
House 143 (Level-03 & 04), Road 16 (Near by Kamarpara Bus Stand), Sector 10,Uttara, Dhaka-1230
01618105155 / 01885407069
Subscribe to our newsletter for regular updates about Offers, Coupons & more
