The Control Technology, Inc. 901B-2589-A is a universal discrete input module that accepts and transmits digital input signals within a control or automation system. It is also identified by CTI 2589-A, complementing the 901B-2589-A designation and placing it in CTI’s universal discrete input module family. This module serves as the digital input interface for binary sensors and field devices, enabling reliable, real-time status reporting to a connected controller or processing unit.
