Product Description
Product Details
| Parameter | Details |
|---|---|
| Manufacturer | Siemens |
| Model/Part Number | 6ES7231-4HF32-0XB0 |
| Description | SIMATIC S7-1200 Analog Input Module SM 1231 AI 8x13 bit |
Product Overview
| Parameter | Details |
|---|---|
| Part Number | 6ES7231-4HF32-0XB0 |
| Product Name | SM 1231 Analog Input Module |
| Application | High-density analog signal acquisition for S7-1200 PLCs in industrial automation, process control, SCADA, and data logging |
| Compatibility | SIMATIC S7-1200 CPUs (all firmware versions); mounts on right-side expansion rail |
| Function | Provides 8 analog inputs with 13-bit resolution, configurable voltage/current ranges, diagnostics, and high accuracy |
Functional Specifications
| Parameter | Details |
|---|---|
| Input Channels | 8 analog inputs (single-ended, 2 groups of 4) |
| Input Types | - Voltage: ±10 V, ±5 V, ±2.5 V, 0_10 V, 0_5 V, 1_5 V - Current: 0_20 mA, 4_20 mA (selectable per channel via TIA Portal) |
| Resolution | 12 bit + sign (13-bit ADC), 0.1% FSR |
| Accuracy | ±0.3% of full scale @ 25°C; ±0.5% over temperature range |
| Input Impedance | - Voltage: >100 kΩ - Current: 250 Ω (internal shunt) |
| Common Mode Rejection | >80 dB @ 50/60 Hz |
| Update Rate | < 1 ms per channel (cycle time dependent on CPU) |
| Conversion Time | 250 µs (all channels) |
| Overrange/Underrange | ±10% with alarm |
| Open Wire Detection | Yes (current mode, < 2 mA) |
| Isolation | 500 V AC (field to logic), channel-to-channel not isolated |
| LED Indicators | 1 green PWR LED, 1 red DIAG LED, 8 green channel status LEDs |
| Diagnostics | Wire break, over/underrange, module fault, short to ground |
| Connection Type | Removable screw terminal block (18-pin, 2.5 mm²) |
| Wire Size | 0.25 _ 2.5 mm² (14_22 AWG) |
| Cable Length | - 1000 m (shielded) - 500 m (unshielded) |
Electrical Specifications
| Parameter | Details |
|---|---|
| Power Supply (Backplane) | 5 V DC (from CPU) |
| Power Consumption (5 V) | 100 mA |
| Power Loss | 2.0 W typical |
| External Sensor Supply | 24 V DC (20.4_28.8 V), via L+ terminal (optional for 2-wire transmitters) |
| Inrush Current | 1.5 A @ 5 V |
Mechanical & Environmental Specifications
| Parameter | Details |
|---|---|
| Dimensions (H x W x D) | 100 mm _ 70 mm _ 75 mm |
| Weight | 0.25 kg |
| Mounting | Snap-on to S7-1200 DIN rail (right of CPU) |
| Housing Material | Plastic (UL94-V0) |
| Color | Siemens light gray |
| Operating Temperature Range | -20°C to +60°C (horizontal), -20°C to +50°C (vertical) |
| Storage Temperature Range | -40°C to +70°C |
| Humidity | 5% to 95% non-condensing |
| Vibration | IEC 60068-2-6 (5g, 5_150 Hz) |
| Shock | IEC 60068-2-27 (15g, 11 ms) |
| Protection Rating | IP20 |
Configuration & Software
| Parameter | Details |
|---|---|
| Configuration Tool | TIA Portal (V15 or higher recommended) |
| I/O Addressing | Automatically assigned (next available analog input words) |
| Parameterization | - Range selection per channel - Filter time (0.1_100 ms) - Diagnostics enable - Scaling (engineering units) - Substitute value on error |
| Function Blocks | Built-in SCALE and NORM functions; supports high-speed sampling via process image |