DDMF2-8AD is an analog input expansion module. The main feature is that it supports MODBUS RTU RS 485 communication mode, supports a variety of configuration software, 8 channels 12Bit analog differential input, 300-115.2Kbps optional, receive and send indicator status, analog input and communication circuit isolation, power polarity protection.
This manual provides detailed information for the DDMF2-8AD analog input module, including its main features, electrical specifications, and communication options. It describes how to configure the module address, communication speed, and input type using DIP switches or the JTDDMX configuration software.
Installation, power connection, RS‑485 wiring, and step‑by‑step debugging procedures are covered, along with CRC calculation for MODBUS RTU messages. The document also offers guidance for integrating the module with PLCs and third‑party SCADA software. This manual is written in Chinese.
| Working voltage | DC24V |
|---|---|
| Power consumption (max) | 1200 mW |
| Communication interface | RS‑485 (standard two‑wire) |
| Maximum modules in network | 32 |
| Communication speed options | 300 bps – 115200 bps |
| Number of input channels | 8 |
| Isolation voltage | 2500 V |
| Dimensions (W×H×L) | 71 mm × 26 mm × 128 mm |
| Weight (approx.) | 0.21 kg |
| Operating temperature | -10 °C to +55 °C |
| Operating humidity | 35 % – 85 % non‑condensing |
The address is set with the DIP switch SW1; the first five bits represent the address (e.g., 00000 = 00H, 11111 = 1FH).
Select the desired baud rate by configuring bits 6‑8 of SW1 (BPS0‑BPS2), which correspond to speeds from 1.2 kbps up to 115.2 kbps.
The module operates from a DC24 V supply; typical current draw is about 50 mA per module.