SCHNEIDER 140DDI84100 – 32-Channel 24VDC Discrete Input Module | Modicon Quantum
Engineering Background
The Schneider Electric 140DDI84100 is a high-density discrete input module engineered for the Modicon Quantum automation platform — one of the most widely deployed process-control architectures in heavy industry, utilities, and critical infrastructure. Designed to interface directly with field-level sensors, pushbuttons, and limit switches, this module delivers deterministic signal acquisition at 24VDC logic levels across 32 independent channels.
Product Positioning
Targeted at process engineers and control-system integrators who require a proven, drop-in replacement or expansion module for existing Quantum racks, the 140DDI84100 eliminates the engineering risk associated with cross-platform substitution. Its direct compatibility with the Quantum backplane and Unity Pro / Concept programming environments makes it the preferred choice for brownfield upgrades and greenfield builds alike.
Complete Technical Specifications
| Part Number | 140DDI84100 |
| Manufacturer | Schneider Electric (Modicon) |
| Module Type | Discrete Input (DI) |
| Platform | Modicon Quantum |
| Number of Channels | 32 channels |
| Input Voltage | 24 VDC |
| Input Current (per channel) | ≈ 7 mA @ 24 VDC |
| Logic Level — State 1 | 11–30 VDC |
| Logic Level — State 0 | 0–5 VDC |
| Input Impedance | 3.4 kΩ |
| Isolation | Optical isolation, channel-to-backplane |
| Response Time | ≤ 1 ms (hardware filter off) |
| Connector Type | 40-pin removable terminal block |
| Backplane Compatibility | Quantum 6-, 10-, 16-slot racks |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5–95% non-condensing |
| Power Consumption | 1.0 W (backplane) |
| Weight | 910 g |
| Certifications | CE, UL, cUL, FM |
| Programming Environment | Unity Pro, Concept, ProWORX |
Proven Application Environments
- Oil & Gas: Wellhead control panels, pipeline SCADA, compressor station I/O
- Power Generation & Utilities: Substation automation, turbine control, load-shedding systems
- Water & Wastewater: Pump station monitoring, valve position feedback, level switch acquisition
- Automotive Manufacturing: Assembly line interlocks, conveyor limit switches, safety gate monitoring
- Chemical & Petrochemical: Reactor interlock systems, emergency shutdown (ESD) I/O expansion
- Building Automation: HVAC control, fire & gas detection interface, access control integration
Engineering Advantages
- High Channel Density: 32 inputs per slot minimizes rack space and reduces per-point wiring cost versus lower-density alternatives.
- Optical Isolation: Channel-to-backplane isolation protects the CPU and adjacent modules from field-side transients and ground loops.
- Configurable Input Filtering: Software-selectable debounce filtering (via Unity Pro) accommodates both high-speed pulse inputs and noisy mechanical contacts.
- Hot-Swap Capable: Removable terminal block allows field wiring to remain intact during module replacement, minimizing downtime.
- Diagnostic LEDs: Per-channel status LEDs provide instant visual confirmation of input state without requiring a laptop connection.
- Backplane Self-Identification: Module ID is read automatically by the Quantum CPU, eliminating manual slot-address configuration.
System Architecture & Signal Flow
Field devices (sensors, switches, pushbuttons) connect to the 40-pin terminal block. Each channel passes through a hardware RC filter and optical isolator before presenting a logic-level signal to the Quantum backplane. The CPU reads all 32 channel states in a single backplane transaction, with scan-cycle latency typically under 1 ms. Wiring follows IEC 61131-2 Type 1/Type 3 sink/source conventions; consult the 140DDI84100 hardware reference manual (Schneider PN 840 USE 100 00) for detailed wiring diagrams.
Sourcing & Quality Verification
- Origin: Sourced from authorized distributors and verified industrial surplus channels.
- Inspection: Each unit undergoes visual inspection, label verification, and functional power-on check prior to dispatch.
- Packaging: Ships in anti-static ESD bag with foam-lined carton; original Schneider packaging retained where available.
- Traceability: Lot number and date code recorded at intake; available upon request for regulated industries.
- Warranty: 90-day operational warranty against DOA and latent defects. Extended warranty available — contact sales.
Procurement Process
- Confirm Compatibility: Verify your Quantum rack model and CPU firmware version against the 140DDI84100 compatibility matrix.
- Request a Quote: Contact support@konmask.com for volume pricing, lead time, and availability confirmation.
- Place Order: Purchase directly via this listing or via PO/proforma invoice for B2B accounts.
- Shipping: DHL / FedEx international express available; export documentation (commercial invoice, packing list, COO) provided.
- Incoming Inspection: We recommend a bench power-on test upon receipt; our technical team can provide a test procedure on request.
Technical FAQ
Q: Is the 140DDI84100 compatible with the Modicon Premium or M340 platform?
A: No. The 140DDI84100 is exclusively designed for the Modicon Quantum backplane. It is not electrically or mechanically compatible with Premium (TSX) or M340 racks.
Q: Can this module be used in a Safety (SIL) application?
A: The standard 140DDI84100 is not SIL-rated. For safety applications, refer to the Quantum Safety (140CPS) series or consult your Schneider Electric safety specialist.
Q: What is the maximum cable length for field wiring?
A: Schneider recommends a maximum of 300 m for 24VDC discrete wiring when using shielded cable. Longer runs require signal conditioning.
Q: Does Konmask provide the hardware reference manual?
A: Yes. The 140DDI84100 hardware reference manual (840 USE 100 00) is available as a free download from Schneider Electric’s website. We can also provide a direct link upon order confirmation.
Q: What is the lead time for out-of-stock units?
A: Typical lead time for sourced units is 3–10 business days. Contact us for real-time availability.
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