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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A03B-0807-C013 |
Part Number: A03B-0807-C013
Manufacturer: FANUC Ltd. (Japan)
Product Type: I/O Unit-A Interface Module — FANUC I/O Link
Product Family: A03B-0807 Series (I/O Unit-A)
Input Voltage: 24VDC (±10%)
Communication: FANUC I/O Link
Compatible CNC: Series 0i, 16i, 18i and related platforms
Country of Origin: Japan
The A03B-0807-C013 is a FANUC I/O Unit-A interface module — the board that connects a CNC controller to its field I/O devices via the FANUC I/O Link serial bus.
It is the gateway between the machine controller and the digital input/output signals from the machine floor: limit switches, tool-change signals, spindle run commands, coolant activation, door interlocks, and everything else the PMC program reads and writes.
The A03B-0807 series represents the early generation of FANUC's I/O Unit-A family. These modules slot into the I/O base units installed in the machine's electrical cabinet, providing the communication interface that the base and its attached I/O modules depend on to exchange data with the CNC.
The C013 variant is a specific interface module configuration within this series. Both C013 and closely related variants (C011, C012) serve the same functional role — as an interface module for the A03B-0807 base — with differences in specific connector or communication options between sub-variants.
| Parameter | Value |
|---|---|
| Part Number | A03B-0807-C013 |
| Manufacturer | FANUC Ltd. |
| Type | I/O Unit-A Interface Module |
| Communication | FANUC I/O Link |
| Supply Voltage | 24VDC ±10% |
| Compatible CNC | 0i, 16i, 18i and related |
| Origin | Japan |
Q1: The CNC shows an I/O Link communication error on the I/O base containing the A03B-0807-C013. What is the first thing to check?
Verify the I/O Link cable connection at both the CNC's JD1A/JD1B port and the module's connector. A loose cable is the most common cause. Also check the 24VDC supply to the module — an absent or low supply causes the module to stop communicating without generating a fault on the module itself.
Q2: The A03B-0807 series is an older generation. Is the A03B-0807-C013 interchangeable with current-generation modules?
The A03B-0807 series is the early I/O Unit-A generation. Current equivalent modules are in the A03B-0819 series, which conforms to UL/C-UL standards and supports I/O Link i. The newer modules are generally backward-compatible as replacements, but the original A03B-0807-C013 cannot be directly swapped into a newer I/O Link i-only system without compatibility verification.
Q3: How many A03B-0807 base units can be connected per I/O Link channel?
Up to 16 groups of I/O slaves can be connected to a single I/O Link. Up to 4 base units can be linked per group for I/O Unit-A configurations connected to a CNC. The total I/O points across all slaves must remain within the I/O Link's maximum I/O point count.
Q4: After replacing the A03B-0807-C013, do PMC parameters need to be changed?
No. The PMC retains all I/O address assignments on the CNC control board. The replacement module takes the same position in the I/O Link topology and operates with the same I/O addresses. No PMC reprogramming is needed for a like-for-like swap.
Q5: A machine has been idle for several years. The A03B-0807-C013 is suspected of causing I/O faults after restart. What should be inspected?
Long storage can cause connector corrosion and electrolytic capacitor degradation on the module's PCB. Inspect the connector pins for oxidation and clean with appropriate contact cleaner. If the I/O faults are intermittent or temperature-dependent after a period of warm-up, internal capacitor aging is the likely cause — board replacement is the practical path.
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