The Omron CP1W-ADB21 PLC Analog Input Option Board provides two channels for bringing voltage and current signals into a compact Programmable Logic Controller system. Its non-isolated analog inputs support 0 to 10 V with 1/4000 resolution and 0 to 20 mA with 1/2000 resolution, allowing analog information from compatible field devices to be converted into data for controller processing. The board is intended for applications where limited analog monitoring capability must be added without installing a larger expansion module. Operating with 24 VDC, it supports compact process monitoring and machine-control configurations. The CP1W-ADB21 extends the CP1W architecture and belongs to the compact PLC analog input range within Omron control products.