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Schneider Electric 140DAI74000 Modicon Quantum Discrete Input Module
The Schneider Electric 140DAI74000 also cataloged as the 140DAI74000 discrete input module, operates as a dedicated hardware component for AC voltage signal acquisition within Modicon Quantum backplane I/O systems. It converts 230 V AC field discrete signals into 16-channel digital input words for PLC scan processing via the Quantum rack communication bus.
Suffix Breakdown & Model Matrix
140 : Modicon Quantum platform series identifier
DAI : Discrete AC Input
74000 : 16-channel 230 V AC high-voltage input variant
Hardware Specifications
| Parameter |
Specification |
| ModelBrand |
Schneider Electric 140DAI74000 |
| Origin |
France |
| Weight |
0.35 kg |
| Dimensions |
Not specified |
| OperatingTemp |
0 to 60 degC |
| PowerConsumption |
<= 5.5 W |
| Input Channels |
16 discrete inputs |
| Input Voltage |
230 V AC |
| Input Current |
<= 11.5 mA (57 to 63 Hz), <= 9.7 mA (47 to 53 Hz) |
| Bus Current |
180 mA |
| Isolation |
1780 Vrms channel to channel and bus |
| Response Time |
0.75 to 12.3 ms (line cycle dependent) |
| Network Frequency |
47 to 63 Hz |
PLC Backplane Communication Integrity (Schneider Electric Platform Behavior)
The module integrates into the Modicon Quantum backplane architecture, where deterministic I/O refresh cycles are synchronized with rack-level bus arbitration. Input word mapping occupies a single 16-bit discrete register, enabling Unity Pro and ProWORX 32 runtime environments to execute cyclic scan updates without additional field-side signal conditioning. Channel-to-bus galvanic isolation at 1780 Vrms maintains separation between high-voltage AC field wiring and internal logic planes, reducing susceptibility to backplane noise coupling during high-density rack operation.
Frequently Asked Questions
Q: Can the module support hot-swap replacement under live backplane power conditions?
A: The 140DAI74000 supports rack insertion in Quantum systems; however, input state stability depends on backplane synchronization and PLC scan state during replacement.
Q: Does each input channel require individual isolation or is isolation shared?
A: Channel-to-channel and channel-to-bus isolation is specified at 1780 Vrms, implemented across grouped internal isolation domains.
Q: What is the impact of line frequency variation on input response time?
A: Response time is line-cycle dependent, varying between 0.75 ms and 12.3 ms based on 47 to 63 Hz operating frequency.
Field Installation Guidelines
Maintain separation between 230 V AC field wiring and low-voltage control cabling to minimize capacitive coupling across adjacent rack terminals. Use shielded routing only where high electromagnetic density exists, ensuring shield termination at a single chassis ground point. Verify that input commons comply with system grounding architecture before energizing rack backplane. Tighten terminal connections to manufacturer torque specifications to avoid micro-arcing under AC switching conditions.
