The FX3U-16CCL-M is Mitsubishi Electric’s CC-Link Ver.2 master station module for the MELSEC FX3U compact PLC series, enabling any FX3U base unit to act as a CC-Link field network master — managing cyclic data exchange with up to 64 CC-Link remote I/O stations, remote device stations, and intelligent device stations for distributed I/O and device communication in FX3U-based automation systems. As the CC-Link master module for the FX3U platform, the FX3U-16CCL-M extends the FX3U’s reach beyond its local I/O and left-side special adapters to a distributed field network with up to 2,048 remote I/O points across the CC-Link network — dramatically expanding the FX3U’s effective I/O capacity beyond the 256-point direct expansion limit. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the FX3U-16CCL-M?
The FX3U-16CCL-M is a MELSEC FX3U series special function module — a right-side extension module (not a left-side special adapter) that installs in the FX3U extension bus alongside I/O expansion modules. Unlike FX3U left-side adapters, the FX3U-16CCL-M occupies one position in the right-side extension chain (consuming 16 points of the FX3U’s 256-point I/O address space for internal use) and provides the complete CC-Link Ver.2 master station functionality for up to 64 slave stations. The module manages CC-Link cyclic data exchange — refreshing remote I/O data (RX/RY) and remote register data (RWr/RWw) between the master and all slaves in the configured network scan — with the remote I/O data mapped to FX3U device memory (X, Y, M, D registers) via auto-refresh settings configured in GX Works2. CC-Link Ver.2 extended cyclic data is supported, providing up to 8× the data capacity per slave station compared to CC-Link Ver.1, enabling high-data-volume intelligent device stations (vision systems, bar code readers, weighing controllers) to exchange large data blocks with the FX3U master.
Key Technical Specifications
- Model: FX3U-16CCL-M
- Function: CC-Link Ver.2 master station
- Network: CC-Link (CLPA standard, Ver.1 and Ver.2 compatible)
- Maximum Slave Stations: 64
- Transmission Speed: 156 kbps to 10 Mbps (configurable)
- Remote I/O Points (RX/RY): Up to 2,048 points (Ver.2 extended cyclic)
- Remote Register Points (RWr/RWw): Up to 512 words
- CC-Link Ver.2 Extended Cyclic: Supported (×2, ×4, ×8 modes)
- Bus Connector: 5-pin CC-Link dedicated connector (CC-Link shielded twisted pair cable)
- Extension Bus Occupation: 16 I/O points (in FX3U extension bus)
- Current Consumption (FX3U bus): 0.08 A at 5 VDC; 0.05 A at 24 VDC
- Operating Temperature: 0°C to 55°C
- Compatible FX3U CPU: All FX3U base units
- Weight: Approx. 0.18 kg
Compatibility & System Integration
The FX3U-16CCL-M is compatible with all CC-Link Ver.1 and Ver.2 slave devices from any CLPA (CC-Link Partner Association) member manufacturer — Mitsubishi remote I/O units (AJ65SBTB1-16D, AJ65VBTCE2-8D), remote device stations (Mitsubishi FR-A800 inverters with CC-Link option, MR-J4 servo amplifiers with CC-Link option), and intelligent device stations from third-party vendors (Keyence vision systems, Cognex barcode readers, Sick safety laser scanners with CC-Link interface) are all compatible as slaves managed by the FX3U-16CCL-M. In mixed FX3U systems where the base unit handles local high-speed I/O and the CC-Link network provides distributed I/O for remote machinery sections, the FX3U-16CCL-M’s auto-refresh function maps remote I/O data to FX3U X/Y and M device addresses automatically each scan cycle — the FX3U ladder program reads remote inputs and writes remote outputs using standard X/Y/M ladder instructions without special FROM/TO buffer memory programming. For systems where the CC-Link network must communicate with Mitsubishi MELSEC-Q or MELSEC iQ-R systems as remote device stations (the FX3U acting as master with MELSEC-Q as intelligent slave via QJ61BT11N), the FX3U-16CCL-M manages the cyclic data exchange while the FX3U ladder program handles the business logic — a configuration used in hierarchical control architectures where FX3U machines report status to a MELSEC-Q supervisory controller.
Expert Tips
When configuring the FX3U-16CCL-M network in GX Works2, always set the transmission speed to the highest value that the installed CC-Link cable infrastructure reliably supports — higher transmission speeds reduce the CC-Link scan time (the time for one complete cycle of data exchange with all slaves), improving the responsiveness of remote I/O. At 10 Mbps, the maximum trunk cable length is 100 m; at 2.5 Mbps, the maximum is 400 m. For factory-floor installations with typical 50–100 m inter-panel cable distances, 2.5 or 5 Mbps provides a good balance of speed and cable distance margin. Use only CC-Link-approved cable (triple-shielded twisted pair, 110 Ω characteristic impedance, Belden 3084A or equivalent) — using standard Ethernet or RS-485 cable causes reflections and communication errors at CC-Link’s higher baud rates. Install 110 Ω termination resistors at both physical ends of the CC-Link trunk cable — missing or incorrect termination (standard CC-Link termination is 110 Ω rather than the 75 Ω or 120 Ω used in other serial bus systems) is the most common cause of CC-Link communication failures during initial commissioning. For systems with more than 16 slave stations, stagger the station numbers sequentially starting from 1 without gaps — unused station number gaps cause the master to report communication errors for the missing stations and can increase the network scan time unnecessarily.
Frequently Asked Questions
Q: Can the FX3U-16CCL-M communicate with CC-Link IE Field Network slaves?
A: No. The FX3U-16CCL-M supports CC-Link (Ver.1 and Ver.2) only — the original RS-485-based CC-Link standard. CC-Link IE Field Network (Gigabit Ethernet-based) requires a different master module — for FX3U systems requiring CC-Link IE Field Network, the FX5U series (iQ-F) with its built-in CC-Link IE Field Network capability is the appropriate specification. The two networks are physically and protocol incompatible.
Q: How many FX3U-16CCL-M modules can be installed in a single FX3U system?
A: Only one FX3U-16CCL-M can be connected to a single FX3U base unit — the FX3U supports a single CC-Link master configuration per system. For applications requiring two independent CC-Link networks, two separate FX3U systems with individual FX3U-16CCL-M modules would be required, with inter-system data exchange implemented via serial communication or CC-Link intelligent device station configuration.
Q: Does the FX3U-16CCL-M support CC-Link Safety (CC-Link Safety remote I/O)?
A: No. CC-Link Safety requires a dedicated safety-certified CC-Link Safety master module — the FX3U-16CCL-M is a standard (non-safety-rated) CC-Link master and cannot manage CC-Link Safety remote I/O stations. For CC-Link Safety slave devices (Mitsubishi WS0-GETH, safety remote I/O), a dedicated safety master must be used. Standard CC-Link slave devices are fully compatible with the FX3U-16CCL-M.
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