The FANUC A20B-2103-0170 is an emergency-stop unit circuit board for compatible FANUC R-30iB Mate Plus robot controllers. Installed inside the controller cabinet's E-stop unit, it forms part of the safety-control path used to monitor emergency-stop and operating-mode conditions.

This listing identifies the internal A20B-2103-0170 PCB rather than every possible complete A05B-2680 emergency-stop unit assembly. Confirm the PCB number, complete E-stop unit number, controller cabinet specification and connector arrangement before ordering.

A20B-2103-0170 Product Information

Robot Emergency-Stop Circuit Function

The A20B-2103-0170 participates in the controller's safety chain, including signals associated with emergency-stop devices, the teach pendant and controller operating modes. A board or fuse fault may prevent normal servo activation or interrupt the controller's safety-ready condition.

PCB and Complete Unit Identification

A20B-2103-0170 is the PCB number. The complete emergency-stop unit may carry an A05B-2680-C4xx assembly number that varies with cabinet type, electrical configuration and certification specification. Do not select a replacement from the A20B number alone when the entire E-stop unit is required.

Compatibility and Safety Checks

Verify A20B-2103-0170 on the original board together with the complete A05B unit number, R-30iB Mate Plus cabinet model, board revision, connectors, fuses and robot safety configuration. Replacement must be performed with power isolated by qualified FANUC robot personnel. Test every emergency-stop device, safety fence circuit, teach-pendant E-stop and operating mode before returning the robot to production.

Related resources: FANUC circuit boards and FANUC robot board repair services.