This manual explains the MODBUS communication specifications, wiring, settings and programming for Mitsubishi Electric's FX5 programmable controller.
The manual begins with safety warnings and general precautions for installing, wiring and maintaining the MELSEC iQ‑F FX5 controller. It then describes the system configuration, communication specifications and the MODBUS protocol details for both serial (RS‑232C/RS‑485) and TCP/IP modes.
Subsequent sections cover step‑by‑step wiring diagrams, parameter settings in GX Works3, master and slave functions, programming examples, and troubleshooting. Appendices provide fault codes, frame specifications and warranty information. This manual is written in Chinese.
| Communication interfaces | RS‑485, RS‑232C |
|---|---|
| Supported baud rates | 300‑115200 bps |
| Data length | 8 bit |
| Parity options | None, Odd, Even |
| Stop bits | 1 bit or 2 bits |
| Maximum master stations | 32 stations |
| Maximum write size | 123 words or 1968 coils |
| Maximum read size | 125 words or 2000 coils |
| Station address range | 1‑247 |
| Maximum RS‑485 transmission distance (FX5‑485ADP only) | ≤ 1200 m |
The controller supports baud rates from 300 bps up to 115200 bps.
Up to 32 slave stations can be connected when the controller operates as a master.
When only the FX5‑485ADP adapter is used, the transmission distance is limited to 1200 m or less.