3RK3231-2AA10 SIEMENS

3RK3231-2AA10 SIEMENS Basis unit

Product  Description：

The 3RK3231-2AA10 serves as the "brain" of a modular safety system. Unlike standard safety relays that handle a single function, this Advanced Central Unit is fully programmable using the SIRIUS MSS ES software. It allows for the integration of multiple safety sensors, such as emergency stop buttons, light curtains, and protective door switches, into a single cohesive safety strategy. The "Advanced" designation indicates that this unit supports an interface for connection to a fieldbus (like PROFIBUS or PROFINET) via an optional interface module, allowing for diagnostic data to be sent to a standard PLC or HMI.

Product Parameters

• Product Brand Name: SIRIUS

• Product Designation: Modular Safety System 3RK3 Central Unit Advanced

• Supply Voltage: 24 VDC (with a permissible range of 20.4 VDC to 28.8 VDC)

• Digital Inputs: 8 safety-related inputs

• Digital Outputs: 1 safety-related relay output and 1 safety-related electronic (solid-state) output

• Test Pulse Outputs: 2 outputs for cross-circuit detection and sensor monitoring

• Number of Interfaces: Connection for up to 9 expansion modules (I/O or functional)

• Degree of Protection: IP20 (intended for control cabinet installation)

• Mounting Type: Standard 35 mm DIN rail or screw mounting

• Dimensions: Width 45 mm, Height 111 mm, Depth 124 mm

• Safety Integrity Level (SIL): Suitable for applications up to SIL 3 (IEC 61508)

• Performance Level (PL): Suitable for applications up to PL e (ISO 13849-1)

Product Advantages

One of the most significant advantages of the 3RK3231-2AA10 is its Scalability. Being a modular system, you can start with the central unit and add expansion modules as your machine's safety requirements grow, which is far more cost-effective than wiring multiple individual safety relays. The Graphical Programming via MSS ES software simplifies the creation of complex safety logic using drag-and-drop function blocks, significantly reducing engineering time.

The unit also provides Enhanced Diagnostics. When coupled with a fieldbus interface, it can transmit detailed status information to a higher-level control system, allowing operators to quickly identify which safety sensor was tripped. Furthermore, the Compact Design of the 45 mm wide housing saves valuable space in the electrical cabinet while still providing a high density of safety-related inputs and outputs.

Important Considerations and Precautions

When implementing the 3RK3231-2AA10, it is critical to perform a Complete Risk Assessment of the machinery to ensure the programmed logic meets the required safety integrity level. During installation, the Polarity of the 24 VDC Supply must be strictly observed; reversing the polarity can damage the internal electronic components.

To ensure effective Cross-Circuit Detection, it is highly recommended to use the provided test pulse outputs for monitoring dry-contact sensors like E-stops. If you are using the unit in a high-vibration environment, ensure the DIN rail clips are securely engaged and consider using end brackets. Finally, always Back up the Configuration File created in the MSS ES software; the system configuration is stored on a removable data medium (Memory Module), which should be handled with care to prevent data loss during maintenance.

Product Applications

The Siemens 3RK3231-2AA10 is ideal for any application where multiple safety functions must be synchronized or monitored simultaneously.

• Machine Tooling: Managing emergency stops, interlocked guards, and enabling switches for CNC machines.

• Packaging Lines: Coordinating multiple light curtains and safety doors across long conveyor systems and palletizers.

• Robotic Cells: Integrating robot safety signals with peripheral safety equipment like laser scanners and pressure mats.

• Material Handling: Ensuring safe operation of high-speed sorting systems and automated storage/retrieval systems (ASRS).

• Automotive Assembly: Protecting operators in complex assembly stations where multiple personnel interact with automated machinery.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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