Mitsubishi QJ71C24 QJ71C24-R2 QJ71CMO Serial Communication Module User Reference Manual

About this manual

The User Reference Manual (Application Part) describes the QJ71C24, QJ71C24‑R2 and QJ71CMO serial communication modules, their safety rules, design considerations, installation and wiring procedures, as well as startup, operation, maintenance and end‑of‑life handling.

Key sections cover PLC CPU monitoring functions, modem communication features, system configuration, data‑frame specifications, sample programs, interrupt handling, ASCII/Binary conversion, external device communication and mode switching. The document also includes revision history and warranty details. This manual is written in Chinese.

What's inside

• Safety Precautions
• Design Considerations
• Installation Guidelines
• Wiring Guidelines
• Startup and Maintenance
• Operation Notes
• Disposal Instructions
• PLC CPU Monitoring Function
• Modem Communication Function
• System Configuration

Specifications

Frequently asked questions

What must be done before installing or removing the module?

All phases of the external power must be disconnected before installing or removing the module.

How far apart should control or communication cables be spaced during installation?

Control or communication cables should be spaced at least 100 mm (3.9 inches) apart.