GE IS230TNDSH2A Discrete I/O Terminal BoardDescription The GE IS230TNDSH2A is a high performance Discrete I O Terminal Board designed for integration with the Mark VIe Speedtronic turbine control system. It serves as a critical interface between field devicessuch as limit switches, solenoids, and relaysand the control systems I O modules. Specifications Attribute Details Model IS230TNDSH2A Manufacturer GE System Compatibility Mark VIe Speedtronic Input Channels 16 discrete inputs (24V DC)