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Where is this product used and why?
The Schneider 140DAI74000 discrete input module is extensively used in industrial automation systems requiring the monitoring of high-voltage discrete signals. Its primary application is in industrial control environments such as manufacturing plants, packaging machinery, and process automation where reliable detection of on/off status signals is essential. This module is designed to handle 230 V AC signals, making it ideal for connecting devices like limit switches, safety alarms, and pushbuttons directly to a Modicon Quantum programmable logic controller (PLC) system. In demanding environments with high electrical noise or transient voltages, the robust input isolation and overvoltage tolerance of the 140DAI74000 assure accurate input status detection and safeguard the controller against electrical faults. Engineers rely on this module to provide dependable status information that forms the foundation for automated decision-making and machine control within complex industrial networks. With support for 16 discrete inputs, it offers a balance of channel density and ease of wiring, serving applications where precise discrete signal monitoring is critical.
Product introduction & positioning
The Schneider 140DAI74000 is a 16-channel AC discrete input module tailored for integration with the Modicon Quantum automation platform. Functioning as the sensory front-end of control systems, this module converts external AC voltage inputs into digital signals recognized by the PLC, enabling the controller to respond to real-world device states. It fits securely into the Modicon Quantum backplane rack environment and communicates via the backplane bus, enabling synchronized and fast data exchange with the central processor. This module’s capability to handle 230 V AC input voltage levels aligns it with industrial-grade applications, providing both fine input granularity and rugged performance. It is compatible with popular Schneider Electric software platforms—including Concept, ProWORX 32, and Unity Pro—facilitating diverse engineering workflows. Positioned as a key component in automation system I/O architectures, the 140DAI74000 supports engineers in building flexible, scalable, and reliable discrete input networks essential for current and legacy control systems.
- 140DAI74000
- 140DAI74000
Key technical features & functional benefits
The Schneider 140DAI74000 features 16 discrete input channels configured for 230 V AC signals, allowing straightforward connection to industrial sensors and switches operating at standard line voltages. Each channel has high input impedance (up to 31,800 Ohms at lower network frequencies) to minimize load on the source circuits, and a low leakage current under 2.6 mA, enhancing safety and signal integrity. The module accommodates a wide input voltage range with guaranteed State 1 detection starting from 165 V AC, ensuring reliable recognition of ON states even under variable supply voltages.
Its input overvoltage tolerance is notable—able to withstand continuous voltage up to 264 V, surges up to 300 V for short durations, and transient spikes up to 400 V for single cycles—enhancing module durability in noisy electrical environments. The response time is optimized for rapid detection, with an OFF-ON response between 0.75 to 4.9 milliseconds and ON-OFF between 7.3 to 12.3 milliseconds, supporting real-time control responsiveness.
Hardware robustness includes 1780 Vrms isolation between input channels and from the backplane communication bus, which minimizes cross-channel interference and prevents fault propagation. The module’s compact standard form factor and modular rack design facilitate efficient installation and system expansion.
Built to withstand industrial environmental conditions, the 140DAI74000 tolerates temperatures from 0 to 60 °C and humidity up to 95%, ensuring long-term reliability. Visual diagnostics via 16 individual green LEDs provide engineers with instant input status visibility, simplifying troubleshooting and system monitoring.
Detailed technical specifications
| Parameter | Value |
|---|---|
| Model | 140DAI74000 |
| Brand | Schneider Electric |
| Product Type | AC Discrete Input Module |
| Number of Inputs | 16 discrete inputs |
| Input Voltage | 230 V AC |
| Input Current | ≤ 11.5 mA (57–63 Hz), ≤ 9.7 mA (47–53 Hz) |
| Guaranteed Voltage State 1 | 165–264 V AC (57–63 Hz), 175–264 V AC (47–53 Hz) |
| Guaranteed Voltage State 0 | 0–40 V AC |
| Input Impedance | 26,500 Ohm (57–63 Hz), 31,800 Ohm (47–53 Hz) |
| Response Time | 0.75–4.9 ms Off-On, 7.3–12.3 ms On-Off |
| Isolation Voltage | 1780 Vrms between channels and bus (1 minute) |
| Max Input Voltage | 264 V continuous, 300 V for 10 s, 400 V for 1 cycle |
| Power Dissipation | ≤ 5.5 W |
| Operating Temperature | 0 to 60 °C |
| Humidity | Up to 95% non-condensing |
| Visual Indicators | 16 green LEDs for input status; 1 green LED for active bus; 1 red LED for fault |
| Certifications | CE Marked |
Related modules or compatible units
140DAI34000 – 24 V AC discrete input module for lower voltage control signals.
140DAO85300 – 32-channel AC discrete output module for switching AC loads.
140DDO35300 – DC output source module providing discrete control outputs at 24 V DC.
140DRO85300 – Relay output module allowing switching of higher power loads.
140ADI34000 – Analog input module for signal conditioning and analog sensor readings.
140CPS11300 – Power supply module supporting Modicon Quantum racks.
140DDS35300 – DC discrete input module complementing the AC input types.
140DEM10000 – Discrete input module for DC voltage ranges, often paired in mixed I/O configurations.
Installation notes & maintenance best practices
When installing the Schneider 140DAI74000, ensure it is mounted on a Modicon Quantum backplane with proper mechanical and electrical connections to facilitate reliable communication. Maintain ambient temperature below 60 °C and provide ventilation sufficient to dissipate up to 5.5 W of heat generated by the module. Grounding and shielding practices must follow Schneider Electric recommendations to prevent electrical noise that can affect signal accuracy. Careful wiring to the screw terminals with attention to torque ratings ensures durable connections and minimizes maintenance issues. The module supports hot-swapping, permitting replacement or upgrades without system shutdown, but personnel should observe electrostatic discharge precautions to safeguard module electronics.
Maintenance routines include routine visual inspection of status LEDs to detect potential channel faults promptly and verifying tightness of wiring connections. Regular verification of input signal integrity through diagnostic software supported by Unity Pro or Concept helps monitor system health. Firmware updates and preventative cleaning during scheduled plant maintenance ensure optimal operation and extend module lifespan by preventing dust accumulation and corrosion in industrial environments.
