Voltage and current input selection
UF20 analog input modules provide four or eight differential inputs with 16-bit resolution. Select a U model for voltage measurement or an I model for current measurement. Each model uses two-wire signal connections and provides magnetic isolation, reverse protection and fault diagnostics.
| Model | Input | Channels | Process data | System feed current |
|---|
| UF20-4AI-U-16 | Voltage | 4 | 8 bytes | <260mA |
| UF20-8AI-U-16 | Voltage | 8 | 16 bytes | <400mA |
| UF20-4AI-I-16 | Current | 4 | 8 bytes | <260mA |
| UF20-8AI-I-16 | Current | 8 | 16 bytes | <400mA |
Measurement characteristics
| Characteristic | Voltage models | Current models |
|---|
| Measuring ranges | 0 to +5V; -5V to +5V; 0 to +10V; -10V to +10V | 0-20mA or 4-20mA, configurable |
|---|
| Signal type | Differential | Differential |
|---|
| Signal connection | Two-wire | Two-wire |
|---|
| Input resistance | >500kΩ | 100Ω |
|---|
| Resolution | 16 bits | 16 bits |
|---|
| Precision | 0.20% | 0.20% |
|---|
| Temperature coefficient | Not specified | ±50ppm/K maximum |
|---|
| Conversion time | <1ms | <1ms |
|---|
| Isolation | Magnetic | Magnetic |
|---|
| Reverse protection | Supported | Supported |
|---|
| Fault diagnostics | Supported | Supported |
|---|
Wiring, mounting and environment
All four models use push-in terminal blocks and a 12mm-wide housing for 35mm DIN rail mounting.
| Characteristic | All models |
|---|
| Operating voltage | 24V DC, +20%/-15% |
|---|
| Connection method | Push-in terminal blocks |
|---|
| Conductor cross-section | 0.34-1.5mm² |
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| Conductor size | AWG22-AWG16 |
|---|
| Stripping length | 8-10mm |
|---|
| Height × width × depth | 75mm × 12mm × 105mm |
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| Mounting | 35mm DIN rail |
|---|
| Ingress protection | IP20 |
|---|
| Operating temperature | -10°C to +55°C |
|---|
| Storage temperature | -20°C to +85°C |
|---|
| Relative humidity | 5-95%RH, non-condensing |
|---|
