Product Details

FANUC A03B-0819-C161, also marked as AOR16G, is a 16-point electromechanical relay output module for FANUC I/O Link distributed rack system, compatible with FANUC 16i-B,18i-B and 21i-B CNC controllers. It is designed to plug into the slot of ABU05A or ABU10A I/O backplane, communicating with the CNC main controller via FANUC proprietary I/O Link serial bus. Different from transistor output modules, this unit adopts physical relay contact switching, which provides complete electrical isolation between the internal I/O bus circuit and the field load side, supporting mixed AC and DC load connection. Each relay contact is rated for 2A, maximum switching voltage up to 250VAC or 30VDC, bringing great flexibility for machine auxiliary circuit design.

Each channel uses independent mechanical relay contact structure. When PMC sends out switching instruction, the internal relay pulls in or releases to conduct or cut off the external load loop. Every channel is equipped with corresponding LED status indicator on the front panel, clearly showing the ON/OFF state of relay action. Maintenance technicians can quickly judge whether the relay is actuating normally, check load open circuit, coil burnout or terminal loose connection without entering CNC diagnosis screen. The terminal block adopts screw wiring structure with transparent protective cover, which protects terminals from accidental touch and makes circuit inspection and wiring modification convenient. Surge absorption components are arranged beside each relay contact to suppress electric arc generated at the moment of contact breaking, slowing down contact ablation and extending the service life of relay points.

The module adopts classic yellow FANUC plug-in housing and locking buckle structure. After inserting into ABU series backplane, it can be firmly locked to avoid poor contact and intermittent action failure caused by long-term mechanical vibration during cutting. It has good dust resistance and oil mist resistance, and can run stably for a long time in the workshop environment mixed with cutting fluid mist and fine metal powder. Users can allocate independent PMC address for each output point through CNC system parameters according to machine design scheme. These relay points are widely used to control AC lubrication pumps, coolant motors, external alarm lamps, solenoid valves with large starting current, safety door lock circuits and auxiliary contactor coils. The isolation feature is especially suitable for occasions where the field load power supply is independent of the CNC 24V control power supply.

It is a direct replacement spare part for original AOR16G modules with relay contact adhesion, contact burnout, indicator failure and no switching action on CNC lathes, machining centers, tapping machines and special CNC machines equipped with 16i/18i/21i-B CNC systems. Every module will pass power-on aging test, 16-channel relay switching cycle test, contact continuity inspection and I/O Link communication matching verification before shipment, checking the sensitivity of relay pull-in and release, contact conduction stability and indicator response consistency. Replacing this faulty relay output module can quickly restore the machine’s AC load and isolated loop control, avoid production shutdown caused by abnormal lubrication, cooling and safety interlock. It is widely used in mold processing, automotive parts turning, precision hardware machining and automated fixture control projects.