MRJ2S40B MITSUBISHI

MRJ2S40B MITSUBISHI Termination Unit

Product  Description：

Mitsubishi Electric Termination Units, also known as Terminal Blocks or Interface Terminal Units, are essential connectivity components designed to simplify the wiring process between field devices and PLC I/O modules. These units act as a centralized junction where external sensors, actuators, and power lines are organized and connected to the controller via standardized high-density cables. They are engineered to replace direct "point-to-point" wiring, which reduces the complexity of control panel assembly and improves long-term maintainability.

Product Parameters

The technical characteristics of Mitsubishi Termination Units focus on electrical capacity and physical connectivity:

• Rated Voltage: Commonly supports 24V DC for logic signals and up to 250V AC/DC for relay-based or power distribution units.

• Rated Current: Typically handles 1A to 2A per point, with common terminals rated for higher total current (often up to 10A).

• Terminal Pitch: Precision spacing, usually 5.0mm or 7.0mm, designed to accommodate standard industrial wire gauges (AWG 22 to 14).

• Connection Type: Available in traditional screw-terminal designs or modern "push-in" spring-clamp designs for vibration-proof connectivity.

• Point Density: Standard configurations include 16-point, 32-point, and 40-point units to match the I/O density of the MELSEC PLC modules.

• Mounting Method: Standardized for 35mm DIN rail mounting, ensuring quick installation and secure attachment within the control cabinet.

Product Advantages

Mitsubishi Termination Units provide significant structural and operational benefits to industrial systems:

• Reduced Wiring Time: By using pre-fabricated cables to connect the PLC module to the termination unit, assembly time is reduced by up to 60 percent compared to manual wiring.

• Elimination of Wiring Errors: Standardized pin-to-pin mapping between the PLC and the terminal unit ensures that signals are correctly routed, minimizing the risk of short circuits or incorrect logic.

• Ease of Maintenance: If a field device fails, it can be disconnected at the terminal unit without disturbing the PLC or the rest of the system wiring.

• Space Optimization: The compact, vertical design allows for high-density wiring in a small footprint, which is critical for modern, space-constrained control panels.

• Signal Protection: Many units include integrated features such as fuses, surge absorbers, or LED status indicators for each point, providing an extra layer of protection for the PLC.

Product Applications

These units are foundational components in any automated system requiring organized field wiring:

• Centralized Control Panels: Organising hundreds of I/O points for large-scale production lines in the automotive or consumer electronics industries.

• Distributed I/O Stations: Serving as the termination point for remote I/O blocks located across a factory floor, connected via network cables.

• High-Vibration Environments: Utilizing spring-clamp termination units in machinery subject to constant movement, such as stamping presses or mobile equipment.

• Safety Systems: Facilitating the wiring of safety relays, emergency stop buttons, and light curtains to the main safety controller.

• Infrastructure Projects: Managing the complex wiring of sensors and motors in water treatment plants, tunnel ventilation systems, and power substations.

Important Precautions

To ensure the safety and longevity of the termination unit, the following guidelines should be strictly followed:

• Torque Specifications: For screw-terminal models, use the specified tightening torque (usually 0.5 to 0.8 N·m). Over-tightening can strip the threads, while under-tightening can lead to high resistance and heat buildup.

• Cable Length Limits: When using high-density interface cables between the PLC and the unit, keep the length as short as possible (typically under 3-5 meters) to prevent voltage drops and signal interference.

• Voltage Separation: Do not mix AC and DC signals on the same termination unit unless the unit is explicitly designed with internal isolation barriers for that purpose.

• Wire Stripping: Ensure that the insulation is stripped to the correct length. Exposed copper outside the terminal can lead to accidental short circuits between adjacent points.

• Current Monitoring: Verify that the total current passing through the "Common" terminal does not exceed the unit’s maximum rating, especially when driving multiple inductive loads like solenoids.

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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Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.