Allen Bradley Compact-IO based on the Bulletin 1769 Compact I/O is the chassis-based modules built for local and distributed I/O for Allen Bradley’s CompactLogix, Compact GuardLogix, or MicroLogix 1500 controller. It features a rackless design to reduce costs of installation and to save space to the parts inventory. The module has a built-in removable block that provides connections to actuators and I/O sensors. There are various types of 1769 Compact modules starting from digital, analog, as well as specialty I/O modules. Each of modules comes with their specifications and specialties. Among of that, in fact there are several main features offered by Bulletin 1769 Allen Bradley Compact-IO.