16-Channel AC Input Module for Reliable Signal Acquisition

Monitor AC control devices with the Schneider Electric 140DAI34000C discrete input module. This Modicon Quantum module provides 16 channels for connecting 24V AC field devices like switches and sensors. It offers reliable performance with a compact standard format for efficient rack space utilization. The 140DAI34000C is designed for industrial durability and complies with major international safety standards.

Electrical Specifications & Ratings

• Brand & Model: Schneider Electric Modicon Quantum 140DAI34000C.
• Input Channels: 16 discrete (on/off) input points.
• Input Voltage: Rated for 24 Volts AC operation.
• Input Current: Typical range from 10.7 mA to 12 mA per point.
• Leakage Current: Maximum of 1.9 mA for reliable off-state detection.
• Bus Current: Requires 180 mA from the rack power supply.
• Power Dissipation: Maximum of 5.5 Watts.
• I/O Addressing: Requires 1 input word in the controller's I/O map.

Environmental & Compliance Details

• Operating Temperature: Wide range from 0°C to 60°C.
• Safety Standards: Complies with UL 508 and CSA standards.
• Safety Marking: CE marked for the European market.
• Module Format: Standard Quantum module size.
• Module Weight: Lightweight at approximately 0.3 kg.

Installation & Wiring Guide

• Install the module in any available slot of a compatible Modicon Quantum rack.
• Connect 24V AC field devices (e.g., limit switches, pushbuttons) to the module's terminal points.
• Ensure the external 24V AC power source for the field devices is properly fused and isolated.
• Observe proper wiring practices: use correct wire gauge and secure terminations.
• Configure the module's single input word within the Unity Pro software project.
• Verify the input status using the controller's diagnostic tools or the module's LEDs (if present).

Packaging & Warranty

• Includes one Schneider Electric 140DAI34000C 16-channel input module.
• Package contains the module and standard mounting hardware.
• Shipped in protective packaging via FedEx, UPS, or DHL.
• Covered by a standard 12-month warranty.

Technical FAQs

• What is the main advantage of an AC input module vs. DC?

AC inputs are ideal for directly interfacing with devices powered by common control transformer voltages (like 24V AC) without requiring a separate rectifier. They also naturally reject certain types of electrical noise.

• Why is maximum leakage current an important specification?

A low leakage current (1.9 mA max) ensures the module reliably reads a field device as "OFF" even when there is small residual current from long wiring runs or induced voltage, preventing false "ON" signals.

• Can I mix this 24V AC module with DC input modules in the same rack?

Yes, you can mix different I/O module types in the same Quantum rack. The controller addresses each module independently, allowing flexible system design.

• What happens if I apply a DC voltage to these AC inputs?

The module will not function correctly and may be damaged. Always ensure your field power supply matches the module's specified input voltage type (24V AC for this model).

• How do I troubleshoot an input that is not responding?

First, check for the presence of 24V AC at the field device and at the module terminal. Then, verify the device itself is operating. Finally, use the software to monitor the raw input bit status to isolate the issue between field wiring and module operation.

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