Allen-Bradley 1746-IO12 SLC 500 Digital IO Module

Allen-Bradley 1746-IO12 is a digital input/output combination module for the SLC 500 family that mounts in a 1746 backplane slot. It provides six 120 VAC input channels and six relay outputs (normally open) in a single 12-point module, enabling mixed digital input and relay-type outputs without using separate I/O blocks. The inputs are specified for 85–132 VAC operation at 50/60 Hz, aligning with typical AC sensing applications in automation environments. When used with a compatible SLC 500 controller, the 1746-IO12 shares the same backplane interface and wiring conventions as other 1746-series I/O modules, simplifying installation, diagnostics, and rack layout in legacy systems. The part number is 1746-IO12 and it is described as a combination I/O module that consolidates input and output functionality in one module to maximize rack capacity in SLC-500 installations. Common applications include basic machine control, panel automation, and remote I/O tasks where both digital signals and relay-actuated loads must be managed from a single module, reducing the need for separate input and output cards and preserving a clean, compact control architecture.