SDCS-IOB-21 | ABB | Digital I/O ModuleDescription The ABB SDCS IOB 21 is a digital input output module designed for integration into ABB drive systems. It provides reliable interfacing between control logic and field level digital signals, supporting both input monitoring and output actuation in industrial automation environments. Specifications Model Number: SDCS IOB 21 Function: Digital input output signal processing Input Channels: Typically 16 digital inputs Output Channels: Typically