Installation, wiring and safety instructions for the Mitsubishi Electric A1SJ71C24-R4 computer link module.
This manual provides detailed safety, installation, wiring and operational guidance for the Mitsubishi Electric A1SJ71C24-R4 computer link module used with MELSEC‑A series programmable controllers. It includes precautions, transmission specifications, and dimensional data.
The document also lists required accessories, such as RS‑422 and RS‑485 terminal resistors, and offers troubleshooting tips for communication errors and proper grounding procedures.
| Interface | RS-422/485 |
|---|---|
| Transmission speed | 300, 600, 1200, 2400, 4800, 9600, 19200 bps |
| Transmission distance | 500 m (1640 ft.) or less |
| Current consumption | 5 VDC 0.1 A |
| Weight | 0.25 kg (0.56 lb.) |
| RS‑422 terminal resistor | 330 Ω (orange‑orange‑brown) |
| RS‑485 terminal resistor | 110 Ω (brown‑brown‑brown) |
The manual classifies safety precautions into two categories: DANGER and CAUTION.
Cables should be installed at least 100 mm (3.9 inches) apart from each other.