The Schneider Electric 140CRA21120 is a Modicon Quantum DIO drop interface — 30 input words, 32 output words, 24 V DC supply with 20…30 V limits. It is now listed as obsolete by the manufacturer.
What the ratings tell you
Two redundant ports, each handling the full I/O count. Supply current maxes at 1.6 A at 24 V with a 30 A inrush for 1 ms. Outputs rated 3 A nominal with short-circuit and overvoltage protection built in. Power dissipation sits at 11 W. On a standard Quantum backplane, the part occupies one slot and works with 2-, 3-, 4-, 6-, 10-, or 16-position racks.
Sourcing an obsolete Quantum DIO drop
Schneider has formally obsoleted this module. There is no direct factory replacement listed. For legacy systems still running this part, supply runs through independent channels — surplus stocks, last-time-buy leftovers, and broker networks. Availability is project-specific. Quoting to an RFQ is the standard path; lead time and condition vary with lot found.
Integration notes
Field-side wiring lands on a 7-pole terminal block. Diagnostics run checksum and RAM address tests at startup and during runtime. Operating ambient 0…60 °C, storage -40…85 °C, altitude to 5000 m. UL 508 listed. Fit check: verify the backplane model accepts this standard-format module.