FLXA402-A-B-AJ-D1-NN-A2-NR-N-N-N-NN/UM Yokogawa

FLXA402-A-B-AJ-D1-NN-A2-NR-N-N-N-NN/UM Yokogawa Digital Input Module

Product  Description：

Yokogawa Digital Input Modules, widely utilized within the CENTUM Distributed Control System (DCS) and ProSafe-RS safety instrumented systems, are high-reliability industrial components designed to interface discrete field signals with central control processors. These modules monitor the open or closed status of field-side switches, relays, pushbuttons, and proximity sensors, translating these physical states into binary data for automated process monitoring, sequential control, and safety interlock execution.

Product Parameters

The technical composition of a Yokogawa Digital Input Module centers on high-density data collection and precise signal filtration:

• Channel Density: Offered in various configurations, commonly providing 16 channels, 32 channels, or 64 channels per module to accommodate diverse field wiring requirements.

• Rated Input Voltage: Supports standard industrial voltage profiles, predominantly 24V DC, 48V DC, 100V to 120V AC, and 200V to 240V AC.

• Input Current Consumption: Typically ranges between 4mA and 6mA per channel at rated voltage, ensuring minimal power draw from the field loop.

• On/Off Thresholds: Engineered with strict voltage detection parameters, where a voltage above 18V DC registers as an "On" state and below 5V DC registers as an "Off" state for a standard 24V system.

• Digital Filter Time: Features adjustable input debounce software settings, allowing users to configure delay times from 1 millisecond to 100 milliseconds to prevent contact bounce interference.

• Dielectric Strength: High electrical isolation, frequently rated at 1500V AC or higher for 1 minute between the field terminals and the internal system circuits.

Product Advantages

Yokogawa Digital Input Modules are highly regarded in continuous process industries due to their diagnostic sophistication and rugged engineering:

• Comprehensive Self-Diagnostics: Advanced models feature advanced circuit monitoring that can detect field wire breaks (open circuits) and external short circuits even when the field contact is open.

• High Availability and Redundancy: Supports dual-redundant configurations where two separate modules can process the same field signals simultaneously, ensuring uninterrupted data acquisition if one hardware unit fails.

• Sequence of Events Recording: Specialized digital input cards provide high-resolution timestamping, capturing status changes down to the millisecond level, which is critical for analyzing the precise sequence of industrial trips.

• Extreme Noise Immunity: Utilizes robust optical isolation for every individual channel, effectively preventing high-voltage spikes, surge currents, and electromagnetic interference on the plant floor from reaching the control logic.

• Environmental Resilience: Built to withstand corrosive industrial atmospheres, featuring optional G3 conformal coating that shields sensitive internal components from moisture, salt, and sulfurous gases.

Product Applications

These digital input modules act as the primary eyes and ears for automated safety and control across heavy industries:

• Process Safety Instrumented Systems: Interfacing with emergency shutdown pushbuttons, fire and gas detectors, and high-pressure switches to initiate automated plant trips.

• Petrochemical Production: Monitoring the exact open or closed limit switch feedback from automated isolation valves, divert valves, and control dampers.

• Power Plant Control: Tracking the contact status of heavy-duty circuit breakers, generator trip relays, and boiler flame safeguard monitors.

• Mining and Materials Handling: Collecting discrete data from conveyor belt misalignment switches, pull-cord emergency stops, and hopper level switches.

• Large Scale Infrastructure: Managing status signals from ventilation fans, water pumps, and motorized doors in remote utility stations and tunnels.

Important Precautions

To guarantee safe installation and preserve the operational lifespan of the module, the following guidelines must be observed:

• Module Polarization: Carefully verify whether the module configuration is designed for sinking inputs or sourcing inputs, as matching the wrong field power supply polarity will render the module inoperable and may cause component damage.

• Live-Maintenance Safety: While the modules support hot-swapping under power, ensure that the field terminal block is safely disconnected or that field loop power is isolated if working with high-voltage AC input modules to prevent accidental electric shock.

• Channel Capacity Constraints: Never exceed the maximum aggregate current rating for the entire module. Even if individual channels are within limits, powering all channels simultaneously from an unregulated source can lead to thermal overload.

• Field Cable Separation: Route low-voltage digital input field cables in separate cable trays away from high-voltage motor power leads and variable frequency drives to prevent inductive cross-talk from generating false input signals.

• Blank Slot Management: If a digital input module is removed for maintenance and not immediately replaced, a dedicated dummy module or slot cover must be installed on the base unit to maintain proper airflow and protect the backplane pins from airborne contamination.

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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