Sysmac Analogue I/O Option Boards Professional range of NX series sysmac analogue I/O option boards from Omron. These screwless analogue option boards are mounted to the option board slot on the CPU unit. The option boards are designed to fit all NX series CPU units. Features & Benefits Connection Type - Screwless clamping terminal block (3, 5 or 8 terminals) 2 x analogue input (136-2774) 2 x analogue output (136-2776) 2 x analogue input / 2 x analogue output (136-2777) 0 to 10 V with a resolution of 1/4000 0 to 20 mA with a resolution of 1/2000