The Control Technology CTI 901E-2589-A (S1) is a universal digital input module for CTI automation systems, available in 8-, 16-, or 32-point configurations. It is designed to collect digital signals from sensors, switches, and other digital devices in industrial control environments and feed those inputs to the PLC logic. The part number identifies a digital input unit with universal input capability across multiple point counts, enabling scalable I/O for CTI applications.
