Dual-Mode DA Output 485 Acquisition Module is an intelligent module integrating signal acquisition, transmission, and DA output. Dual-Mode DA Output 485 Acquisition Module features high measurement accuracy, excellent stability, a modular structure, flexible configuration, good linearity, and anti-interference capability, and supports Modbus RTU communication.
Features
Supports input of 24 types of common industrial standard signals;
Supports Modbus RTU communication;
Offers multiple transmission output modes, with 4 channels available for output;
Powered by 220V AC / 24V DC (±0.1V) power supply;
Three-terminal isolation for signal input, power supply, and transmission output, with an isolation voltage of 2000V AC;
Compact size for easy installation, compatible with standard 35mm DIN rail mounting;
Input
K-type thermocouple; S-type thermocouple;
R-type thermocouple; T-type thermocouple;
E-type thermocouple; J-type thermocouple;
B-type thermocouple; N-type thermocouple;
WRe3-WRe25 thermocouple; WRe5-WRe26 thermocouple; 4～20mA current signal;
0～20mA current signal; Cu50 copper resistor;
PT100 platinum resistor; 0～80Ω resistance signal;
0～400Ω resistance signal; 0～20mV voltage signal;
0～100mV voltage signal; 0～1V voltage signal;
1～5V voltage signal; 0～5V voltage signal;
-20～+20mV voltage signal; -100～+100mV voltage signal; -5V～+5V voltage signal
Output
Channel 0: 0-5V / 0-10V / 0-20mA / 0-10mA
Channel 1: 1-5V / 4-20mA
Communication
Standard photoelectrically isolated Modbus RTU communication;
Other Detailed Parameters
| Parameter Category | Specification Details |
| Comprehensive Measurement Accuracy | 0.001FS ± 1 digit |
| AD Accuracy | 22 bits |
| AD Speed 13 | SPS (Samples Per Second) |
| Transmission Accuracy | 16 bits |
| DA Speed 10M SPS | (Mega Samples Per Second) |
| Communication Protocol | Modbus RTU |
| Output Impedance | ≤350Ω (for current output); ≥500KΩ (for voltage output) |
| Isolation Voltage | 2000V AC (between input, output, and power supply, tested for 1 minute) |
| Temperature Drift | 50ppm (parts per million) |
| Electromagnetic Compatibility (EMC) | GB/T 18268 (equivalent to IEC 61326-1) |
| Ambient Temperature | 0～50℃ |
| Relative Humidity | ≤85% RH (avoid exposure to highly corrosive gases) |
| Power Supply | DC24V (±0.1V) / AC220V |
| Power Consumption | ≈5W |
| Overall Dimensions Width × Height × Depth | 45 × 100 × 115mm |
| Mounting Structure | 35mm DIN rail mounting |
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