6ES7131-7RF00-0AB0 SIEMENS

A SIEMENS BaseUnit (Basisunit) is a fundamental mechanical and electrical modular component designed primarily for the SIMATIC ET 200SP distributed I/O system. It serves as the base socket that mounts directly onto a standard DIN rail, providing the electrical backplane connection, field wiring terminals, and the mechanical mounting slot for electronic I/O modules. The BaseUnit separates the wiring infrastructure from the electronic components, allowing permanent cabinet wiring to be completed prior to the installation of I/O modules.

Product Specifications

• System Compatibility: Exclusively designed for SIMATIC ET 200SP I/O modules and peripheral systems.

• Operating Voltage: 24 V DC supply voltage, with select variants supporting up to 120 V DC or 230 V AC for specific power modules.

• Max Load Current: AUX bus and process terminals typically support up to 10 A continuous load for internal power group distribution.

• Terminal Connection Types: Push-In spring-cage terminals supporting conductor cross-sections from 0.14 mm² to 1.5 mm² (AWG 26 to AWG 16).

• Terminal Density: Available in 16-terminal (BU type A0/A1) and multi-terminal options depending on module requirements.

• Power Group Opening: Available as Light BaseUnits (opens a new potential group) or Dark BaseUnits (forwards the potential group from the adjacent left module).

• Mounting Method: Standard 35 mm DIN rail mounting with integrated latching and potential group contact fingers.

• Protection Class: IP20 protection according to IEC 60529 standard.

• Operating Temperature: Standard range from -30°C to +60°C (horizontal installation) or -30°C to +50°C (vertical installation).

Key Product Advantages

• Toolless Push-In Terminal Technology: Allows fast, reliable tool-free insertion of solid wires or stranded wires with ferrules, drastically reducing control cabinet assembly time.

• Live Module Replacement (Hot-Swapping): Electronic I/O modules can be inserted or removed under live operating conditions without disrupting field wiring or stopping adjacent bus communication.

• Integrated Mechanical Coding: Automatic coding elements lock upon the first insertion of an I/O module, preventing the incorrect module type from being inserted into the BaseUnit during future maintenance.

• Flexible Potential Group Management: Light and Dark BaseUnit variants allow flexible division of power supply groups without requiring extra terminal blocks or complex jumper wiring.

• Compact Footprint: High terminal density in a narrow enclosure saves significant space on the DIN rail inside control cabinets.

Important Operational Considerations

• Correct Selection of Light vs. Dark BaseUnits: A new potential group must always start with a Light BaseUnit (white terminal block) to feed in power, while Dark BaseUnits (dark gray terminal blocks) rely on the left adjacent BaseUnit for potential forwarding.

• Maximum Current Limitations: Total load across a single potential group must not exceed 10 A to prevent thermal overload on the internal potential busbars.

• Backplane Pin Care: Take care during module insertion or removal to ensure alignment and prevent bending the delicate internal backplane connector pins.

• Proper Shielding for Analog Signals: Shielded cables for sensitive analog signals require direct connection to optional shield connection elements to ensure adequate electromagnetic compatibility (EMC).

• Environmental Enclosure: Designed with an IP20 rating, requiring mounting inside an enclosure with an appropriate IP rating to protect against dirt, dust, and moisture.

Industrial Applications

• Process Industry Automation: Used in chemical, pharmaceutical, and water/wastewater plants to interface field sensors and actuators while allowing live maintenance.

• Automotive Manufacturing: Applied in body shops, assembly lines, and paint shops for modular, distributed I/O connection in high-vibration environments.

• Special Purpose Machinery: Integrated by original equipment manufacturers (OEMs) into packaging machinery, conveying systems, and machine tools for high-density, space-saving panel designs.

• Energy and Building Automation: Deployed in power generation control rooms, HVAC control systems, and substation monitoring setups for reliable signal acquisition.