The Omron XWT-ID16 is a Digital Input Expansion Unit designed for the CompoNet Series of Remote I/O Terminals . It is used to expand the input capacity of a CompoNet Slave Unit (such as CRT1-ID16, CRT1-OD16, CRT1-ROS16, or CRT1-ROF16) . The unit provides 16 DC input points in a compact form factor and features a screw terminal block for secure and convenient wiring .