1. General Specifications
Parameter Specification
Product Name SM331 Analog Input Module
Order Number 6ES7331-7PF01-0AB0
Module Type 8-Channel Analog Input
Compatibility S7-300 PLC System
Electrical Isolation Channel-to-channel and channel-to-backplane
2. Input Specifications
Parameter Specification
Channels 8 (configurable per channel)
Input Types Voltage/Current/Resistance/Thermocouple/RTD
Voltage Ranges ±10V, ±5V, ±2.5V, 1-5V
Current Ranges ±20mA, 0-20mA, 4-20mA
Resolution 15-bit (including sign)
Accuracy ±0.1% of full scale (voltage/current)
3. Performance Characteristics
Parameter Specification
Conversion Time 20ms per channel (typical)
Cycle Time 160ms (all channels)
Common Mode Rejection >60 dB
Noise Rejection >40 dB
4. Electrical Specifications
Parameter Specification
Power Supply 24V DC (from S7-300 backplane)
Power Consumption 1.5W (typical)
Current Consumption 60mA (24V DC)
Sensor Supply Yes (for 2/4-wire transmitters)
5. Mechanical Specifications
Parameter Specification
Dimensions (W×H×D) 40 × 125 × 120 mm
Weight 300g
Protection Class IP20
Mounting S7-300 Rack
6. Environmental Conditions
Parameter Specification
Operating Temperature 0°C to +60°C
Storage Temperature -40°C to +70°C
Relative Humidity 5% to 95% (non-condensing)
7. Certifications
Standard Compliance
CE Yes
UL Yes
cULus Yes
RoHS Compliant
8. Typical Applications
Process variable monitoring (pressure, temperature, flow)

Laboratory measurement systems

Quality control instrumentation

Energy management systems

9. Ordering Information
Complete designation: 6ES7331-7PF01-0AB0

Package includes: Analog input module, documentation

10. Special Features
Individual channel configuration

Open-circuit detection

Underrange/overrange monitoring

Galvanic isolation between channels