What Is SCADA? Supervisory Control Without Replacing the PLC
SCADA sits above PLCs and RTUs: it acquires field data, alarms operators, and issues supervisory commands across plants and remote assets—without replacing local deterministic control.

Designed for seamless industrial network integration, this communication interface connects MELSEC Q Series programmable controllers directly to EtherNet/IP networks. The Mitsubishi Electric QJ71EIP71 enables robust cyclic tag-based data exchanges, allowing high-speed PLC-to-PLC communication across complex manufacturing systems. Note that this specific module is engineered strictly for tag-based communication between programmable controllers and does not support standard assembly instance communication profiles.
| Parameter | Value |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Number | QJ71EIP71 |
| Product Type | EtherNet/IP Interface Module |
| Base Series | MELSEC Q Series |
| Interface Port | 1x RJ45 Port |
| Transmission Speed | 100 Mbps / 10 Mbps (Auto-negotiation) |
| Communication Protocol | EtherNet/IP (Tag Communication only; Instance-based communication not supported) |
| Internal Current Consumption | 0.45 A at 5V DC (supplied from rack backplane) |
| Country of Origin | Japan |
| Shipping Weight (Calculated) | 2.0 kg |
If your application requires communication with external sensor manifolds, remote I/O blocks, or third-party drives that only support Instance-based messaging (Class 1 Assembly instances), you cannot use the QJ71EIP71. Consider implementing a CC-Link IE Field Network module or using a dedicated third-party EtherNet/IP gateway module designed for slave-device instance integration.
The QJ71EIP71 is strictly optimized for controller-to-controller data synchronization via Tag Communication. Always verify the memory capacity of the hosting Q-Series CPU, as extensive tag configurations can consume notable processing cycles and network buffer allocations during synchronous high-frequency polling.
Always use Category 5e (or higher) Shielded Twisted Pair (STP) cabling in plant floor environments. High-voltage transient noise from nearby variable frequency drives can degrade packet delivery. Ensure the ground terminal (FG) on the main Q Series base unit is securely connected to a low-impedance earth ground to maintain noise immunity through the RJ45 shield connection.
Ensure the MELSEC Q Series rack power is completely switched off and locked out.
Align the lower hook of the QJ71EIP71 module with the mounting hole of the base unit slot.
Push the module firmly into the base unit connector until it seats flush, then tighten the top mounting screw to the specified torque rating (0.36 to 0.48 N-m).
Connect the industrial STP Ethernet cable into the RJ45 port until the lock tab clicks securely into place.
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
United States
|