The Mitsubishi QJ71E71-100 is an Ethernet interface module for the Mitsubishi Q Series PLC. It allows Q-PLC units to communicate over Ethernet, making it easier to exchange data between machines or systems.
Understanding the Communication Setup
When connecting two Q-PLCs using QJ71E71-100 modules, each one has a specific role:
- Active Connection (Client) – Initiates the communication
- Passive Connection (Server) – Waits for communication requests
The Passive mode can be:
- Full Passive Mode – Uses the Active Connection’s IP address in settings
- Unpassive Mode – Does not require IP and Port ID settings
Configuring the Active Connection
- Open Network Parameter → Ethernet
- Network Type: Ethernet
- Network No: 1
- Station No: 2
- Open Operation Setting
- Set IP Address: Example –
192.168.1.252
- Set IP Address: Example –
2. Open Setting in Network Parameters
- Create two ports – one for receiving, one for sending.
Port Settings Example
Port 1 (Receiver)
- Protocol: TCP
- Mode: Active
- Role: Receiver
- Local Port:
2000 - Destination IP:
192.168.1.254 - Destination Port:
2000
After entering the values, click End.
Programming for Communication
To start communication, open both Port 1 and Port 2 with the command:
ZP.OPEN U0, K1 // Open Port 1
ZP.OPEN K2 // Open Port 2
Once ports are open, data can be sent and received between the two PLCs.
- Receive Data:
ZP.BUFRCV - Send Data:
ZP.BUFSND
Sample Programs
You can find sample programs for both Active and Passive modes in the Download Sample section.
Download Sample Examples
Why Use QJ71E71-100 for PLC Communication?
- Reliable Mitsubishi PLC to PLC communication
- Supports Modbus TCP and Ethernet protocols
- Easy integration for industrial automation
- Works for SCADA communication and remote monitoring
You can also download FX5U PLC communication manual from Mitsubishi Electric official website.
