The FANUC A02B-0323-C205 is an SDU1 separate detector interface basic unit for compatible FANUC CNC systems. It connects external position detectors—including compatible linear scales, rotary encoders and pulse coders—to the CNC's FSSB servo-feedback network.

This basic unit supports feedback for up to four axes. A compatible A02B-0323-C204 additional unit can expand the detector interface to as many as eight axes, subject to the CNC model, FSSB path and servo software configuration.

A02B-0323-C205 Product Information

External Position-Feedback Function

A02B-0323-C205 receives position feedback from separately mounted detectors rather than relying only on the motor pulse coder. This arrangement supports machine configurations using full-closed-loop control, where a linear scale or other external detector measures the actual movement of the machine axis.

Basic and Additional SDU Units

A02B-0323-C205 is the four-axis basic unit. A02B-0323-C204 is the related four-axis additional unit and connects to the basic unit using the specified expansion connection. The two models perform different roles and should not be treated as interchangeable replacements.

Compatibility and Installation Checks

Confirm the complete A02B-0323-C205 label, CNC series, FSSB path, number of controlled axes, detector signal type, connector layout and servo parameters. Back up CNC and servo parameters before replacement. After installation, verify the FSSB configuration, detector direction, reference position and full-closed-loop operation before machining.

Related resources: FANUC interface and I/O units and FANUC CNC interface repair services.