User manual for Mitsubishi Electric QJ71C24N serial communication module covering installation, wiring, specifications, and safety precautions.
This manual provides safety precautions, handling instructions, and general information for the QJ71C24N serial communication module used with MELSEC‑Q series programmable controllers. It emphasizes reading all safety warnings before installation and outlines the required protective measures to avoid electric shock, fire, or equipment damage.
The document details mounting, wiring, terminal resistor selection, interface specifications (RS‑232, RS‑422/485), and configuration steps in GX Developer, including station number settings and linked operation options. Physical dimensions, recommended cables, and warranty information are also included.
| Maximum transmission speed (CH1) | 230400 bps |
|---|---|
| Maximum transmission speed (CH2) | 115200 bps |
| RS‑232 maximum cable length | 15 m (49.2 ft) |
| RS‑422/485 maximum cable length | 1200 m (4592.4 ft) |
| Internal current consumption (5 V DC) | 0.31 A |
| External dimensions (H × W × D) | 98 mm × 27.4 mm × 90 mm |
Read all safety precautions in the manual, follow the “DANGER” and “CAUTION” warnings, and ensure the product is powered off before mounting or removing the module.
Set a value between 0 and 31 for the station number; use 0 for a one‑to‑one connection with an external device.