DDMF2-4AD is an analog input expansion device used for programmable controllers, DCS, PCS, computers, and other control and data acquisition systems. It supports MODBUS RTU RS-485 communication, has 4 channels of 12-bit analog differential input, selectable communication rate, and isolation between analog input and communication circuit.
The DDMF2-4AD is an analog‑input module for PLC, DCS, PCS and computer‑based control systems. It communicates via MODBUS RTU over RS‑485 and supports up to 32 modules on a single bus. The module offers four isolated analog input channels with selectable 0‑5 V, 0‑20 mA or 4‑20 mA ranges and a 12‑bit resolution.
The manual describes power requirements (DC 24 V, max 1100 mW), environmental limits (‑10 °C to +55 °C, 35‑85 % RH), physical dimensions and mounting, wiring diagrams, parameter setting methods, and the CRC calculation used for MODBUS communication. It also includes step‑by‑step procedures for configuring baud rate, data format and channel wiring. This manual is written in Chinese.
| Power supply | DC 24 V ±5 % |
|---|---|
| Maximum power consumption | 1100 mW |
| Communication interface | RS‑485 (MODBUS RTU) |
| Baud rate | 300 bps – 115200 bps |
| Data format | 7‑8 data bits, parity (odd/even), 1 stop bit |
| Maximum transmission distance | <1200 m at 19200 bps |
| Number of input channels | 4 |
| Input signal types | 0‑5 V, 0‑20 mA or 4‑20 mA |
| Resolution | 12 bit |
| Isolation voltage | 2500 V |
| Operating temperature | -10 °C to +55 °C |
| Operating humidity | 35 % – 85 % RH |
| Weight (unpacked) | ≈0.21 kg |
| Mounting type | U‑type mounting |
The module provides four independent analog input channels.
The module consumes up to 1100 mW.