Mitsubishi Electric QJ71E71-100 MELSEC-Q Ethernet Module
A Q-series intelligent Ethernet interface module for MC/SLMP, FTP, email and CPU-monitoring functions.
Product Profile
QJ71E71-100 is a Mitsubishi Electric MELSEC-Q Ethernet interface module for a Q-series PLC rack. It provides 100BASE-TX/10BASE-T communication and supports MC/SLMP protocol, FTP, email and CPU-monitoring functions.
The module must be checked against the Q-series base, firmware, network plan and required open connections. Keep the exact -100 suffix because the network interface and application support are part of the model identity.
Technical Data
| Manufacturer | Mitsubishi Electric |
|---|---|
| Model | QJ71E71-100 |
| Product Family | MELSEC-Q Ethernet interface module |
| Ethernet Port | RJ45, fixed MDI |
| Supported Link | 100BASE-TX / 10BASE-T |
| Transmission Speed | 100 Mbps / 10 Mbps |
| Maximum Segment | 100 m |
| Simultaneous Open Connections | 16 |
| Fixed Buffer | 1K words × 16 |
| Random Access Buffer | 6K words × 1 |
| Email Attachment Buffer | 6K words × 1 |
| Email Main Text Buffer | 960 words × 1 |
| I/O Points | 32 intelligent points |
| Internal Current | 0.50 A at 5 VDC |
| Dimensions | 98 × 27.4 × 90 mm |
System Role
- Provides the Ethernet interface between a MELSEC-Q CPU system and plant or supervisory networks.
- Handles deterministic buffer exchange for control and monitoring data.
- Supports host applications through MC/SLMP, FTP and email services.
- Requires network addressing, security and firmware controls appropriate to the site.
Compatibility
- Use the Q-series hardware manual and module firmware revision to confirm system support.
- Reserve the required 32 intelligent I/O points and 5 VDC current budget.
- Plan RJ45 cabling within the 100 m segment limit or use approved plant-network infrastructure.
- Verify CPU, base, network and supervisory software settings before cutover.
Applications
- Q-series PLC Ethernet data exchange.
- SCADA, HMI, MES and host-computer communication.
- FTP or email reporting from an installed PLC system.
FAQ
How many connections can QJ71E71-100 keep open?
The published module specification lists 16 simultaneous open connections; allocate them across the required services.
Which protocols are useful on QJ71E71-100?
MC/SLMP, FTP, email and CPU-monitoring functions are documented; confirm the exact CPU and firmware support.
What network limit matters for QJ71E71-100?
The copper Ethernet segment is specified to 100 m, so longer routes need suitable plant-network infrastructure.
What should be backed up before replacing QJ71E71-100?
Save PLC parameters, IP settings, routing, MC/SLMP device mapping, FTP/email settings and CPU-monitoring configuration.
What acceptance tests are appropriate for QJ71E71-100?
Check link negotiation, data exchange, FTP, email, CPU monitoring, connection count and PLC fault status under controlled conditions.
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