Fanuc A66L-6001-0023#L150R0 Interface Fiber Optic Cable A66L60010023#L150RO A66L-6OO1-OO23#L15ORO

A66L-6001-0023#L150R0 | FANUC FSSB Fiber Optic Cable — 0.15m (0.5 ft) / Inside Cabinet / COP10A-COP10B / SVM Servo Modules

FSSB Inside-Cabinet Optical Link — The 0.15m Short Connection

The A66L-6001-0023#L150R0 is FANUC's shortest standard FSSB fiber optic cable — 0.15 metres (150mm, approximately 0.5 ft) of optical fiber with COP10A and COP10B connectors at each end, designed for intra-cabinet connections between adjacent servo modules or between the CNC main board and the first servo amplifier in the FSSB chain.

At 0.15m, this cable serves the tightest mounting configurations in FANUC servo drive cabinets — where servo modules sit directly beside each other on a DIN rail or panel, and the optical link needs to span only the gap between adjacent units. The unsheathed construction (no reinforced outer sheath) keeps the cable compact and lightweight for the short, protected routing paths inside the control cabinet.

Key Specifications

FSSB — The Bus This Cable Serves

The FSSB (FANUC Serial Servo Bus) is FANUC's high-speed optical bus for communication between the CNC control unit and the servo amplifier system:

CNC-to-SVM link: The FSSB originates at the CNC main board's optical output port and connects to the first SVM (Servo Module in the cabinet). Each CNC axis command and encoder feedback data packet travels over this optical link.

SVM-to-SVM daisy chain: Within the servo cabinet, SVMs are connected in series by FSSB cables — COP10A (transmit) of one SVM connects to COP10B (receive) of the next SVM. The entire servo axis chain communicates through this daisy-chain topology.

End-of-chain termination: The COP10A port of the last SVM in the chain must be covered with an optical termination cap (supplied with the SVM module) — leaving it open causes communication errors on the entire FSSB bus.

Applications

FANUC αi servo system intra-cabinet connections: CNC machining centres and turning centres using FANUC αi (or βi) servo modules in the servo cabinet — the 0.15m cable links adjacent SVM modules in the FSSB daisy chain where modules are mounted side by side.

FANUC R-30iA/R-30iB robot servo connections: FANUC industrial robot controllers (R-30iA, R-30iB, R-30iB+) use FSSB optical cables to connect the robot controller's main board to the internal servo amplifier modules — the 0.15m length fits where the modules are mounted in close proximity inside the controller cabinet.

FANUC 16i/18i/21i/30i CNC systems: CNC control units using the FSSB optical servo bus — the short cable connects CNC axis boards to adjacent SVM modules in multi-axis CNC drive cabinets.

FAQ

Q1: What is the difference between A66L-6001-0023 (FSSB) and A66L-6001-0026 (HSSB)?

A66L-6001-0023 is the FSSB cable — used inside the servo cabinet to connect SVM units in the FANUC Serial Servo Bus daisy chain via COP10A/COP10B optical ports. A66L-6001-0026 is the HSSB cable — used for the longer-distance connection between separate cabinets or the CNC and robot body, with a reinforced (N/S sheathed) outer jacket. FSSB cables are typically shorter (0.15m–2m for adjacent modules); HSSB cables span metres to tens of metres between cabinets.

Q2: What happens if the COP10A port on the last SVM in the FSSB chain is left uncovered?

The FSSB uses optical serial communication — the COP10A transmit port of the last SVM in the chain must be covered with the optical termination cap supplied with the SVM module. Without the cap, stray light and lack of electrical termination on the optical bus cause communication errors that affect all axes on the FSSB chain, generating SV0401 or similar servo communication alarms on the CNC.

Q3: Can A66L-6001-0023 cables be used outside the control cabinet?

No. The unsheathed construction of A66L-6001-0023 cables is only appropriate for protected routing inside a closed control cabinet. The unsheathed optical fiber is fragile and susceptible to mechanical damage from bending, crushing, or abrasion if routed in exposed environments. For connections outside the cabinet or between separate enclosures, use the appropriate longer A66L-6001-0023 variant with R03-suffix or the reinforced A66L-6001-0026 N/S sheathed cable.

Q4: What is the optical connector format (COP10A/COP10B) on A66L-6001-0023?

COP10A and COP10B are FANUC's proprietary snap-fit optical fiber connectors for the FSSB interface. COP10A is the transmit port; COP10B is the receive port. The A66L-6001-0023#L150R0 cable has one COP10A connector and one COP10B connector — one plugs into the transmit port of one module, the other into the receive port of the next module. Both connector types use the same physical format — the A/B designations identify the transmit/receive direction only.