Product Overview
Downtime on a Modicon Quantum line rarely waits for a purchase order. When a discrete input module fails, every stalled sensor signal costs production time. The Schneider Electric 140DDI35300C solves that problem directly: a 32-point low-voltage DC discrete input module built for the Quantum automation platform, ready to restore input density without redesigning the rack.
This module accepts 24 V DC nominal input with an operating window of 19.2 to 30 V, so it tolerates the real-world voltage sag and swell found on plant floors. Positive (sink) logic keeps interfacing with existing control wiring straightforward.
Technical Specifications
| Specification | Value |
|---|---|
| Product line | Modicon Quantum |
| Discrete input number | 32 |
| Groups of channels | 4 |
| Logic input | Positive (sink) |
| Discrete input voltage | 24 V DC |
| Input voltage limits | 19.2…30 V |
| Voltage state 1 guaranteed | 15…30 V DC |
| Voltage state 0 guaranteed | -3…5 V DC |
| Current state 1 guaranteed | >= 2 mA |
| Input impedance | 2500 Ohm |
| Addressing requirement | 2 input words |
| Response time | <= 1 ms (both transitions) |
| Isolation between group | 500 Vrms for 1 minute |
| Isolation between group and bus | 1780 Vrms for 1 minute |
| Power dissipation | 1.7 W |
| Bus current requirement | 330 mA |
| Net weight | 0.3 kg |
What These Ratings Mean on the Floor
Four isolated groups matter when input wiring runs to different field devices. The 500 Vrms group isolation limits fault propagation between channel banks, while 1780 Vrms between group and bus protects the backplane. A response time of 1 ms or less on both state transitions suits fast discrete events such as limit switches and proximity sensors.
Each group needs 2 input words of addressing, so plan the rack configuration before installation. The module draws 330 mA from the bus and dissipates 1.7 W, a modest thermal load inside a standard-format Quantum slot.
Where the 140DDI35300C Fits
Oil and gas operators use 32-point density to monitor valve positions, pressure switch contacts, and pump run status without consuming extra rack space. Water treatment and packaging lines apply the same logic to conveyor sensors and safety interlocks.
Because the module carries conformal coating (Humiseal 1A33), it suits humid or lightly contaminated control rooms. Operating temperature spans 0 to 60 °C, and storage tolerance reaches -40 to 85 °C.
Installation and Maintenance
Mount the module in a standard Quantum slot, confirm the addressing allocation, and verify state 1 voltage at 15 V DC or above at the field terminals. Keep input wiring separated from high-power cabling to preserve the 10 V/m electromagnetic immunity rating.
Inspect terminal torque and LED status periodically. The green input LEDs and the red external fault LED give a quick health check without a meter. Follow the manufacturer’s safety manual for all service work.
Compatibility and Sourcing
This module belongs to the Modicon Quantum platform and integrates through the Quantum backplane. Confirm rack compatibility and addressing with your controls engineer before ordering.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. Contact Oil AutoTech today for pricing and availability.
