The CP1W-16ET1 is a programmable logic controller (PLC) module manufactured by Omron. It is part of the CP1W series and is designed for use with Omron's CP1E or CP1L series PLCs. The CP1W-16ET1 module features 16 digital input channels and 16 digital output channels. It allows for high-speed input and output processing and supports a wide range of applications in industrial automation and control systems.