About Siemens S7-300 8AI Expansion Module

The Siemens S7-300 8AI Expansion Module by Naksh Technology Solution LLP is designed to expand the analog input capabilities of Siemens S7-300 PLC systems. Featuring 8 analog inputs, this module allows for precise signal acquisition from various analog devices such as sensors and transducers in industrial automation applications. It ensures accurate data processing for real-time control and monitoring of complex systems. The module integrates seamlessly with the Siemens S7-300 PLC and can be easily configured using STEP 7 or TIA Portal software, making it an ideal solution for applications requiring reliable and high-performance analog input control. 

Data Sheet 6ES7331-7PF01-0AB0

SIMATIC S7-300 | Analog Input Module SM 331 (Isolated) 8 AI | 2/3/4-wire | Pt100/200/1000, Ni100/120/200/500/1000, Cu10 | 16-bit resolution, 50 ms Connector: 1 40-pole

Supply Voltage

• Load voltage L+ (DC): 24 V

• Reverse polarity protection: Yes

Input Current

• From load voltage L+ (without load), max.: 240 mA

• From backplane bus 5 V DC, max.: 100 mA

Power Loss

• Typical: 4.6 W

Analog Inputs

• Number of inputs: 8

• For resistance measurement: 8

• Max permissible input voltage: 75 V (35 V continuous, 75 V for max 1 s, 1:20 duty factor)

Input Ranges

Voltage / Current / Thermocouple

• Not supported

Resistance Thermometer

Resistor Ranges

Characteristic Linearization

• Parameterizable for resistance thermometers: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10

Cable Length

• Shielded: Max 200 m

Analog Value Generation

• Resolution with overrange: 16-bit (Two's complement)

• Integration time: Parameterizable

• Conversion time:

  • Up to 4 channels: 10 ms/module

  • Over 5 channels: 190 ms/module

  • 8 channels: 80 ms/module

• Interference voltage suppression (Hz): 400 / 60 / 50

Encoder / Resistance Connection

• 2-wire connection: Yes, without resistance correction

• 3-wire connection: Yes

• 4-wire connection: Yes

Errors / Accuracy

Operational Error (Full Temperature Range)

• Resistance: 0.1 %

• Resistance thermometer: 1 K

Basic Error (at 25 C)

• Resistance: 0.05 %

• Resistance thermometer: 0.5 K

Diagnostics / Status

• Diagnostics function: Yes, parameterizable

• Diagnostic alarm: Yes, per group

• Limit value alarm: Yes, parameterizable

• Hardware interrupt: Yes, channels 07

• Diagnostic info readable: Yes

• LED: Group error SF (red): Yes

Isolation / Potential Separation

• Between channels: Yes

• Between channels (groups of 2): Yes

• Between channels and backplane bus: Yes

• Between channels and power supply of electronics: Yes

• Isolation tested: 500 V DC

Connection Method

• Required front connector: 40-pin

Dimensions & Weight

• Width: 40 mm

• Height: 125 mm

• Depth: 120 mm

• Weight: Approx. 272 g 

Technical Details