Micrologix 1500 - Special Function Modules The 1769 Compact I/O modules can be used as local and distributed I/O for a CompactLogix or MicroLogix 1500 controller. Each I/O module includes a built-in removable terminal block with finger-safe cover for connections to I/O sensors and actuators. The terminal block is behind a door at the front of the module. I/O wiring can be routed from beneath the module to the I/O terminals.