A385P-30 MITSUBISHI

A385P-30 MITSUBISHI Relay Input Module

Product  Description：

Mitsubishi Electric Relay Input Modules are specialized interface components used within the MELSEC PLC ecosystem. Unlike standard transistorized input modules that rely on semiconductor switching, these modules use mechanical electromagnetic relays to detect the presence of external signals. This makes them exceptionally robust and capable of interfacing with a wide variety of AC and DC voltage sources without the need for complex signal conversion. They act as a rugged gateway, translating high-energy field signals into the low-voltage logic required by the PLC CPU.

Product Parameters

The technical characteristics of Mitsubishi Relay Input Modules are focused on voltage flexibility and electrical isolation:

• Input Voltage Range: Capable of accepting both AC and DC signals, typically supporting 24V DC, 100V-120V AC, and 200V-240V AC inputs on the same module architecture.

• Points per Module: Standard configurations usually offer 8 or 16 points to ensure adequate spacing for higher voltage wiring.

• Rated Input Current: Typically ranges from 4mA to 10mA per point, ensuring low power consumption from the signal source.

• Response Time: Mechanical switching speeds generally range from 10ms to 20ms for both "Off to On" and "On to Off" transitions.

• Isolation Method: Provides physical mechanical isolation between the field circuit and the PLC internal logic, with insulation resistance often rated at 100MΩ or higher.

• Dielectric Withstand Voltage: Usually rated for AC 1500V or 2500V for one minute between the input terminals and the ground.

Product Advantages

Relay-based input modules offer distinct benefits in specific industrial environments:

• Universal Signal Compatibility: Because they use mechanical contacts, these modules can often handle different voltage types across various common terminals, making them ideal for retrofitting older control panels.

• High Noise Immunity: Mechanical relays are virtually immune to the electromagnetic interference (EMI) and transient voltage spikes that might falsely trigger sensitive transistor inputs.

• Simplified Troubleshooting: The audible "click" of the relay and the clearly visible status LEDs allow maintenance personnel to verify signal arrival without needing a multimeter.

• Superior Electrical Protection: The physical gap between open relay contacts provides a high level of protection against surge voltages, preventing damage to the expensive PLC CPU.

• Low Leakage Current Tolerance: Unlike some semiconductor inputs, relay inputs are not affected by small amounts of leakage current from long cable runs or specialized sensors.

Product Applications

These modules are primarily utilized in heavy industrial sectors and infrastructure:

• Power Distribution: Monitoring the status of large circuit breakers and disconnect switches in electrical substations.

• Legacy Machine Integration: Connecting modern PLC systems to older machines that use high-voltage AC limit switches and pushbuttons.

• HVAC and Building Management: Receiving signals from fire alarm contacts, thermostat relays, and heavy-duty pressure switches.

• Water and Waste Treatment: Interfacing with float switches and heavy-duty valves where wiring distances are long and prone to electrical noise.

• Transportation Systems: Managing input signals from track-side equipment and elevator safety chains where high-voltage signals are standard.

Important Precautions

To ensure the longevity of the mechanical components and the safety of the system, consider the following:

• Mechanical Life Limits: Unlike transistor inputs, relays have a finite lifespan (typically 100,000 to 1,000,000 operations). Avoid using them for high-frequency switching tasks like pulse counting.

• Minimum Load Requirement: Ensure the input signal provides enough current to "wipe" the relay contacts; extremely low-current signals (micro-amps) may eventually fail to penetrate oxidation on the contacts.

• Response Delay: Account for the 10-20ms mechanical delay in your PLC program logic. This module is not suitable for high-speed motion capture or millisecond-accurate timing.

• Contact Bounce: Mechanical relays exhibit "bounce" when closing. Ensure that the PLC input filter timers are set correctly to prevent a single button press from being registered as multiple inputs.

• Vibration Resistance: Install the PLC rack in a location free from excessive vibration, as heavy mechanical shocks can cause relay contacts to chatter or momentarily change state.

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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