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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A06B-6096-H103 |
The Fanuc A06B-6096-H103 is the SVM1-40S, a single-axis alpha servo amplifier module from Fanuc's A06B-6096 FSSB-interface series.
The A06B-6096 family is the FSSB (fiber optic) counterpart to the A06B-6079 PWM series — both series contain the same SVM model designations with identical electrical ratings, differing only in the CNC communication interface.
Where the A06B-6079-H103 (Type A/B PWM) connects to earlier Fanuc controls via the PWM serial protocol, the A06B-6096-H103 communicates via the FSSB (Fanuc Serial Servo Bus) fiber optic link used by the i-series CNC controls — 15i, 16i, 18i, 20i, 21i — that define the modern alpha-series machining era.
The SVM1-40S designation places this module in the 40-amp class of the single-axis SVM1 series at the 9.4A continuous output level.
The "S" suffix differentiates this from the SVM1-40L (H104) — in Fanuc's alpha series motor nomenclature, "S" denotes the short-frame motor variant (α3/3000 or α6/2000) while "L" denotes the long-frame or special variant.
The H103 drives the α3/3000 and α6/2000 motors specifically, which are compact mid-range alpha motors used on a wide range of small to medium CNC machine tools.
The FSSB fiber optic interface is the characteristic that places this module in the modern alpha generation.
Where the older PWM Type A/B modules use point-to-point copper cable connections, the FSSB connects all servo modules in a ring topology on a single fiber optic cable pair, greatly reducing the cable count in the drive cabinet and achieving much higher data rates that enable the faster servo cycle times of the i-series controls.
| Parameter | Value |
|---|---|
| Module Model | SVM1-40S |
| Interface | FSSB (Fanuc Serial Servo Bus), fiber optic |
| Axes | Single (L channel) |
| Rated Input | 283–325V DC bus, 2.5kW |
| Max Output Voltage | 230V AC |
| Rated Output Current | 9.4A |
| Compatible Motors | α3/3000, α6/2000 |
| Power Source | Alpha PSM shared DC bus |
| Compatible Controls | FANUC 15i/16i/18i/20i/21i (i-series) |
The switch from the PWM A06B-6079 series to the FSSB A06B-6096 series was driven by the introduction of Fanuc's i-series CNC controls, which use FSSB as their exclusive servo amplifier interface.
While the electrical specifications of the two series are identical for each SVM model, the communication hardware is fundamentally different: the A06B-6096 series has a fiber optic connector (typically COP10A/COP10B) for the FSSB ring connection, while the A06B-6079 series has the PWM cable connectors.
The FSSB ring topology connects the CNC's servo interface card to the first module in the stack, then daisy-chains through each subsequent module back to the CNC.
This reduces the multi-cable harness of the PWM system to a single fiber optic ring with short jumper cables between adjacent modules.
For a machine with four servo axes and a spindle, replacing five individual cables with one ring cable run substantially simplifies cabinet wiring and reduces the number of connectors that could generate intermittent contact faults over the machine's service life.
The α3/3000 motor — Fanuc's "Model 3" alpha, rated at 3N·m continuous torque at 3000rpm — is a compact motor used on lighter CNC axes where rapid acceleration response is more important than high sustained torque.
The α6/2000 provides higher torque (6N·m continuous) at a lower rated speed, covering axes with heavier carriages or higher friction requirements.
Both motors' continuous current demands fall within the SVM1-40S's 9.4A rating, and both are commonly found on small machining centres, small turning centres, and EDM electrode positioning systems using i-series controls.
Q1: Can the A06B-6096-H103 be used on a machine that currently has A06B-6079-H103 (PWM) modules?
No, not without upgrading the CNC. The A06B-6079-H103 uses PWM Type A/B interface for non-i-series controls; the A06B-6096-H103 uses FSSB fiber optic for i-series controls. The two series require different CNC interface cards and different parameter settings.
A direct swap between them is not possible without converting the CNC to i-series or adding an FSSB-to-PWM interface adapter, which is not a standard solution.
If the machine's CNC is an i-series control, the A06B-6096-H103 is the correct module.
Q2: What does the FSSB fiber optic cable connection look like on this module?
The A06B-6096-H103 has two fiber optic connectors — COP10A (input from the preceding module or CNC) and COP10B (output to the next module in the ring).
These are small plastic optical fiber connectors that carry the FSSB digital signal.
The fiber cables used are Fanuc plastic optical fiber, which is flexible and relatively easy to route in the cabinet.
Handling precautions include avoiding sharp bends and protecting the connector tips from contamination — a dirty or bent fiber connector produces FSSB communication errors (Alarm L or U on the module's LED, corresponding to FSSB disconnect on COP10A or COP10B).
Q3: What is the SVM1-40L (A06B-6096-H104) and how is it different from the H103?
The SVM1-40L and SVM1-40S share identical current output ratings (9.4A) but are configured for different motor frame types within the same current class.
The "S" matches short-frame motors such as the α3/3000 and α6/2000; the "L" matches long-frame or special-geometry motors in the same current class.
The difference is in the servo parameter set — the control loop gains and motor constants that the drive uses are different for S and L motor types.
Fitting the wrong variant (H103 vs H104) for the installed motor type will not produce obvious alarm conditions but will result in suboptimal servo performance.
Q4: How is the SVM1-40S positioned within the A06B-6096 FSSB module lineup?
The A06B-6096 single-axis lineup runs from SVM1-12 (H101, 3.0A) through SVM1-20 (H102, 5.9A), SVM1-40S (H103, 9.4A), SVM1-40L (H104), SVM1-80 (H105, 18.7A), SVM1-130 (H106, 52.2A), up to SVM1-360 (H108, 115A).
The H103 sits in the mid-lower range, correctly sized for the α3/α6 motor class. For heavier motors requiring more than 9.4A continuous, the SVM1-80 or larger must be specified.
Q5: What alarm codes are associated with the A06B-6096-H103?
The module's 7-segment LED display shows alarm codes consistent with the alpha FSSB servo module alarm structure. Alarm 8 indicates L-axis overcurrent (HCL) — the standard diagnostic is to disconnect the motor power cables and test motor insulation resistance.
Alarm 1 (internal fan stopped) requires immediate attention to prevent thermal damage. Alarms L and U indicate FSSB fiber optic disconnect on the COP10A and COP10B connectors respectively — inspect the fiber connectors for cleanliness and secure seating before condemning the module.
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