Siemens LOGO! 12/24RCEO Logic Module, 8 Digital Inputs (4 Analog), 4 Relay Outputs, 400 Blocks

The Siemens LOGO! 12/24RCEO is a compact and versatile logic module designed for efficient control in small-scale automation projects. This unit operates on a 12/24 V DC power supply and features 8 digital inputs, 4 of which can be configured as analog inputs, along with 4 relay outputs. With a capacity of 400 function blocks, it provides sufficient processing power for a wide range of industrial and building automation tasks. The module is designed without an integrated display, focusing on a streamlined, space-saving installation width of 72 mm, and includes advanced connectivity options such as Ethernet, an integrated web server, and cloud communication capabilities via MQTT.

Advantages

This logic module stands out due to its high level of integration and flexibility. It combines multiple traditional control functions, such as time relays, contactor relays, and staircase timers, into a single compact device. The inclusion of an Ethernet interface allows for seamless communication between multiple LOGO! modules or SIMATIC S7 systems. Furthermore, the integrated web server enables remote monitoring and control of connected loads via WLAN or the internet, with the added benefit of user-defined web pages that do not require HTML knowledge. The system is also highly scalable, allowing for expansion with additional modules to increase the number of inputs and outputs as project requirements grow.

Suitable for

• Small-scale industrial automation systems
• Building automation and smart home control
• Lighting control and staircase timer applications
• Remote monitoring and control of electrical loads
• Integration into existing SIMATIC S7 networks

When it may not be suitable

The LOGO! 12/24RCEO may not be the optimal choice for large-scale, complex industrial processes that require high-speed processing or a significantly higher number of I/O points beyond the expansion limits. Additionally, because this specific model lacks an integrated display, it is less suitable for applications where local, on-device parameter monitoring or manual adjustments are frequently required without a connected PC or external display.

Key specifications

• Power supply: 12/24 V DC
• Digital inputs: 8 (4 of which are analog-capable)
• Outputs: 4 relay outputs
• Memory capacity: 400 function blocks
• Communication: Integrated Ethernet, web server, and MQTT cloud support
• Installation width: 72 mm
• Expansion: Modularly expandable with additional I/O modules

How to use

To begin using the Siemens LOGO! 12/24RCEO, connect the device to a compatible 12/24 V DC power source. Programming is performed using the LOGO! Soft Comfort software on a PC, where you can create and simulate your switching logic before transferring it to the module. The Ethernet port allows for easy connection to your network, enabling the use of the integrated web server for remote management. If your application requires more inputs or outputs, you can attach expansion modules to the side of the base unit. For data logging or project storage, a standard microSD card can be inserted into the designated slot.

What to consider before purchase

• Ensure your power supply matches the 12/24 V DC requirement.
• Verify if your application requires a local display; if so, consider a model with a screen or an external text display.
• Check if the 400-block memory capacity is sufficient for your specific logic requirements.
• Confirm that your network infrastructure supports the Ethernet-based communication features.

Usage recommendations: For optimal performance and security, ensure that the module is installed in a clean, dry environment within an appropriate control cabinet. Always use the latest version of LOGO! Soft Comfort software to take full advantage of the cloud connectivity and MQTT features.