Siemens LOGO! 24CE Logic Module, 8 Digital Inputs (4 Analog), 4 Digital Outputs, 400 Blocks

The Siemens LOGO! 24CE is a compact and versatile logic module engineered for efficient small-scale automation in both industrial and building management environments. This unit serves as a central controller, offering 8 digital inputs, 4 of which can be configured as analog inputs, and 4 digital transistor outputs. With a memory capacity of 400 function blocks, it allows for the implementation of complex control logic within a space-saving 72 mm wide housing. The device features an integrated display and keypad for direct interaction, while the built-in Ethernet interface supports advanced connectivity, including web server functionality and cloud integration via MQTT.

Advantages

The primary strength of the Siemens LOGO! 24CE lies in its high level of integration and flexibility. By combining multiple traditional relay functions into a single programmable unit, it significantly reduces wiring complexity and installation space. The inclusion of an integrated web server allows users to monitor and control processes remotely via a standard web browser, even without specialized HTML knowledge. Furthermore, the modular design ensures that the system can grow alongside project requirements, supporting expansion modules for additional inputs and outputs. The capability to handle cloud communication and MQTT protocols makes it a future-proof solution for modern IoT-enabled automation tasks.

Suitable for

• Small-scale industrial machine control
• Building automation systems such as lighting and HVAC control
• Staircase lighting timers and impulse relay replacement
• Remote monitoring of connected loads via Ethernet or Internet
• Integration into KNX building management systems with additional modules

This logic module may not be suitable for large-scale, high-speed industrial processes that require extensive processing power or a high number of I/O points beyond the modular expansion limits. It is also not intended for safety-critical applications that require certified fail-safe hardware.

Key specifications

• Supply voltage: 24 V DC
• Digital inputs: 8 (4 configurable as analog inputs)
• Digital outputs: 4 transistor outputs
• Memory capacity: 400 function blocks
• Communication: Integrated Ethernet, web server, MQTT, cloud connectivity
• Installation width: 72 mm
• Display: Integrated backlit display with keypad

To use the Siemens LOGO! 24CE, mount the unit on a standard DIN rail and connect the required 24 V DC power supply. Inputs and outputs should be wired according to the specific requirements of your application. Programming can be performed directly on the device using the integrated keypad or via a PC using the LOGO! Soft Comfort software. Once the logic program is created and loaded, the device can be monitored and adjusted through the built-in web server or the front-panel display.

What to consider before purchase

• Ensure the 24 V DC power supply matches the device requirements.
• Verify if the 4 transistor outputs are sufficient for your load types or if relay expansion modules are needed.
• Check if the 400-block memory capacity is adequate for the complexity of your automation logic.
• Confirm if additional communication modules are required for GSM or GPS connectivity.

For optimal performance, ensure that the firmware is updated to the latest version and utilize a standard microSD card for data logging and project storage. Always verify the electrical load limits of the transistor outputs before connecting external devices.