Fanuc LTD Type A03B-0815-C003 Expansion Module A03B-0815-COO3 A03B0815COO3 AO3B-O815-COO3 A03B-0815-C003

24 DI / 16 DO / No MPG / Up to 1024/1024 Points

The A03B-0815-C003 is Expansion Module B in FANUC's A03B-0815 I/O connection module family — a CNC slave I/O unit that extends the digital I/O capacity of FANUC CNC controls over the CNC's I/O link bus. Each unit provides 24 digital inputs and 16 digital outputs. This particular variant carries no MPG (Manual Pulse Generator) interface — for installations where MPG handwheel input is handled at another module position or at the CNC controller itself.

The module communicates with the CNC as a slave on the I/O link — the serial communication bus that FANUC uses to connect the CNC to distributed I/O modules in the machine cabinet and on the machine structure itself. Up to 16 modules can connect to a single CNC as slaves, scaling the system to a maximum of 1024 digital inputs and 1024 digital outputs.

This expansion capability covers the I/O requirements of complex machining centres, large-format CNC machines, and multi-axis systems with extensive PLC logic for automation sequences, tool changers, pallet handling, and coolant management.

The A03B-0815 series covers multiple I/O connection module variants. The primary differentiator between them is whether the module includes an MPG (Manual Pulse Generator) interface for handwheel jog connection. The C003 variant (Module B) carries no MPG interface — it is a pure digital I/O expansion unit. If the machine requires handwheel jog connection at a distributed I/O module, the MPG-equipped variant within the A03B-0815 series is the correct specification.

Confirm the installed module's label and the machine's I/O link configuration before ordering. In a multi-module I/O link chain, each module's slot address and I/O assignment in the CNC's PMC parameters determines which DI/DO points it occupies. A replacement module occupying the same physical slot does not require I/O address reassignment.

The A03B-0815 I/O connection module series is used with FANUC Series 16, 18, and 21 CNC controls, as well as related i-series variants (16i, 18i, 21i). Compatibility depends on the specific CNC model and the PMC I/O link configuration. Confirm the CNC model and existing I/O link slave configuration before adding or replacing this module.

The MPG (Manual Pulse Generator) interface handles the handwheel jog input for manual axis movement. If the machine uses an MPG handwheel and the connection is routed through this module position, the MPG-equipped variant is required. Installing the C003 (no MPG) in an MPG-equipped position leaves the handwheel disconnected from the CNC. Confirm the machine's wiring documentation before ordering.

The A03B-0815-C003 occupies a defined slot in the I/O link chain. The CNC's PMC I/O link parameters assign an I/O address block to each connected module based on its slot position. After replacing the module, I/O addresses remain unchanged provided the replacement occupies the same physical slot position.

No. The CNC's I/O link architecture limits the total slave count to 16 modules, providing a maximum of 1024 DI / 1024 DO across the entire slave chain. For I/O requirements beyond this limit, additional CNC control axes or a dedicated PMC platform would be required.

Verify the I/O link cable connections at both ends of the replaced module are fully seated. Check that the module's station address switches (if present) match the original configuration. A module with an incorrect address appears as a missing slave to the CNC, producing an I/O link communication alarm. Confirm the CNC's PMC I/O link configuration lists the correct module count and addresses.