The QJ61BT11N is the CC-Link Ver.2 master/local communication module for the MELSEC-Q programmable logic controller series, manufactured by Mitsubishi Electric. It enables the MELSEC-Q system to act as a CC-Link master station, controlling up to 64 remote stations across a high-speed industrial field network. In stock at Atlantech Drives. Request your quote within 24–48 hours with worldwide shipping and 12-month warranty.
What Is the Mitsubishi QJ61BT11N?
The QJ61BT11N is a CC-Link Ver.2 interface module that provides MELSEC-Q CPU systems with master or local station functionality on a CC-Link network. CC-Link (Controller & Communication Link) is Mitsubishi’s open industrial network standard for deterministic, real-time communication between PLCs, drives, I/O modules, sensors, and HMIs. The Ver.2 designation indicates support for the extended cyclic transmission capability, which increases the usable data bandwidth per remote station by factors of 2×, 4×, or 8× compared to CC-Link Ver.1, enabling connection of devices with larger data payloads — such as servo drives with process data tables or vision systems — without consuming additional station addresses.
Key Technical Specifications
- Network standard: CC-Link Ver.2 (backward compatible with Ver.1 devices)
- Station types supported: Master station, local station, standby master station
- Maximum number of connected stations: 64 remote stations per master
- Communication speeds: 156 kbps, 625 kbps, 2.5 Mbps, 5 Mbps, 10 Mbps
- Maximum cable length: 1,200 m at 156 kbps; 100 m at 10 Mbps
- Cable type: CC-Link dedicated cable (Ver.2 recommended for 10 Mbps)
- Extended cyclic setting: ×1, ×2, ×4, ×8 per remote station
- I/O points occupied: 32 points
- Power consumption: 5 V DC, 0.54 A
- Applicable CPU: MELSEC-Q series (QnUD, QnUDE, QnPH, QnPRH)
- Operating temperature: 0 to 55°C
Typical Industrial Applications
The QJ61BT11N is widely used in machine automation architectures where a MELSEC-Q CPU must coordinate large numbers of distributed I/O points, drives, and smart field devices across a single network cable. Typical deployment scenarios include: automated assembly lines with distributed pneumatic valve islands and sensor blocks connected as CC-Link remote I/O; multi-axis motion systems using Mitsubishi MR-J3/MR-J4 servo amplifiers with CC-Link interfaces; conveyance and sorting systems where variable frequency drives (FR-A/E/F series with CC-Link option cards) receive speed references via the network; and packaging lines integrating barcode readers, vision sensors, and reject mechanisms as CC-Link intelligent device stations. The Ver.2 extended cyclic capability is particularly valuable in these last applications, where vision system or drive data tables exceed the data capacity of a single Ver.1 station allocation.
Expert Tips
- Always terminate both ends of the CC-Link trunk cable with 110 Ω termination resistors (included with the QJ61BT11N). Missing or incorrect termination is the single most common cause of CC-Link communication errors and is frequently misdiagnosed as a station configuration fault.
- When mixing Ver.1 and Ver.2 remote stations on the same network, the master automatically operates in Ver.1 compatibility mode for Ver.1 stations. However, to use Ver.2 extended cyclic (×2, ×4, ×8) on any station, all stations in the reservation for that extended block must also be Ver.2 capable — plan station allocation carefully in GX Works2 network parameters.
- Use the CC-Link diagnostic function in GX Works2 (Network → Diagnostics → CC-Link Diagnostics) to view per-station error counts and communication retry statistics in real time. A station showing consistently elevated retry counts but no data errors typically indicates a marginal cable connection or excessive cable length for the selected speed — reduce the communication speed one step before replacing hardware.
Frequently Asked Questions
Q: Is the QJ61BT11N compatible with CC-Link IE Field or CC-Link IE Control networks?
A: No. The QJ61BT11N supports CC-Link (classic, RS-485-based) Ver.1 and Ver.2 only. CC-Link IE Field and CC-Link IE Control are Ethernet-based networks and require separate modules — the QJ71GF11-T2 for IE Field and the QJ71GP21-SX for IE Control.
Q: Can the QJ61BT11N operate as a standby master for redundant CC-Link configurations?
A: Yes. The QJ61BT11N supports standby master station operation. In this mode, a second MELSEC-Q system with a QJ61BT11N configured as standby master monitors the active master and takes over network control automatically if the primary master fails, without interrupting remote station communication.
Q: How many QJ61BT11N modules can be installed in a single MELSEC-Q system?
A: Up to 8 QJ61BT11N modules can be mounted in a single MELSEC-Q system, allowing a single CPU to act as master on up to 8 independent CC-Link networks simultaneously — useful for physically separated machine sections requiring network isolation.
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