Introduction
When a Modicon Quantum rack loses its discrete input module, production visibility disappears with it. The Schneider Electric 140DDI35310C restores that visibility with 32 input channels on a single standard-format module. This low-voltage DC discrete input module belongs to the Modicon Quantum automation platform and handles 24 V DC field signals in demanding plant environments.
For maintenance engineers, the practical value is simple: one module covers 32 points, so you replace fewer parts and free up rack space. The 140DDI35310C carries CE marking and conformal coating, making it a practical spare for oil, gas and industrial automation cabinets.
Key Parameters at a Glance
Channel Density and Logic
The module provides 32 discrete inputs arranged in groups of four. It uses negative (source) logic, so inputs switch against a negative reference. Voltage state 1 is guaranteed from -30 to -15 V DC, while state 0 is guaranteed from -5 to 0 V DC. Current state 1 requires at least 2.5 mA at Us = -14 V; current state 0 stays at or below 0.5 mA.
Speed and Protection
Response time is 1 ms or less in both directions, from state 0 to state 1 and back. Input protection is resistor-limited, and input impedance is 2400 Ohm. The absolute maximum input is 30 V continuous, with a 50 V decaying pulse for 1 ms. Addressing needs two input words.
Electrical and Environmental Ratings
Bus current requirement is 330 mA. Isolation between group and bus is 1780 Vrms for one minute; between groups it is 500 Vrms for one minute. Operating temperature spans 0 to 60 °C, storage spans -40 to 85 °C, and relative humidity reaches 95 % without condensation. The module weighs 0.3 kg and supports altitudes up to 5000 m.
Installation and Service Notes
Mount the 140DDI35310C in a standard Quantum slot and confirm the addressing assignment of two input words before power-up. Because the module uses source logic, verify field wiring polarity against the negative reference. Front-panel LEDs simplify service: one green LED shows bus communication, one red LED flags external faults, and 32 green LEDs report input status point by point.
Conformal coating (Humiseal 1A33) resists moisture and dust, which suits humid or contaminated cabinets. For maintenance planning, inspect LED behavior periodically and follow the manufacturer’s safety manual for all service work.
Reliability in Harsh Plants
The 140DDI35310C meets UL 508 and CSA C22.2 No 142, with certifications including FM Class 1 Division 2, RINA, GOST, C-tick and RMRS. It withstands 4 kV contact and 8 kV air electrostatic discharge, plus 9.1 V/m electromagnetic fields from 80 to 2000 MHz. That ruggedness keeps input monitoring stable where electrical noise is common.
FAQ
How many inputs does the 140DDI35310C provide?
It provides 32 discrete input channels, organized in groups of four, with 32 green status LEDs.
What input voltage does this module use?
It operates at 24 V DC, with input limits from 19.2 to 30 V.
What is the module’s response time?
Response time is 1 ms or less from state 0 to state 1 and from state 1 to state 0.
Does it support high-temperature operation?
Yes. The operating range is 0 to 60 °C, with storage from -40 to 85 °C.
How is the module protected against contamination?
It uses conformal coating (Humiseal 1A33) for moisture and dust resistance.
Contact Oil AutoTech today for pricing and availability.
