Allen-Bradley 1771-0X USNTC01 PLC

Allen-Bradley 1771-0X USNTC01 PLC is a 1771-series input/output module designed to snap into a 1771 I/O chassis to extend a control system’s discrete I/O, using the 1771 backplane for communication and power. It occupies the leftmost slot in its 1771 I/O chassis, with a backplane current requirement of 1.2 A at 5 V DC and compatibility with any Series A or B 1771 I/O chassis, making it suitable for retrofits or expansions in legacy Rockwell Automation environments. The module connects via standard 20-pin ribbon cable interfaces to its backplane and employs the 1771 I/O backplane architecture common to the era’s PLC-5/SLC 500 lineage, allowing coordinated operation with other 1771 modules and external/slot power supplies. Operational conditions specify a 0 to 60°C working temperature range and storage from -40 to 85°C, with 5 to 95% relative humidity (non-condensing), ensuring suitability for many industrial settings. The USNTC01 designation denotes its regional/variant code within the 1771-0X family, aligning with Rockwell’s older modular I/O ecosystem where discrete I/O modules are grouped by backplane compatibility and mounting geometry. This module is intended for use as part of a modular, field-replaceable I/O strategy, enabling straightforward expansion, maintenance, and compatibility with existing 1771 backplane systems.