PLC | Siemens | 6ES7331-7KB02-0AB0 6ES7 331-7KB02-0AB0 S7-300 Analog input SM 331

Product Description: Siemens 6ES7331-7KB02-0AB0

The Siemens 6ES7331-7KB02-0AB0 is an analog input module from the SIMATIC S7-300 series, designed to provide eight differential analog input channels with a resolution of 12 bits. It supports voltage and current signal types, making it ideal for integrating sensors and process signals into S7-300 automation systems. This module is especially suited for precision measurement tasks in industrial applications such as manufacturing, processing, and infrastructure control.

Key Features

• Channels: 8 differential analog inputs
• Input Signal Types: Voltage (±10 V) and Current (0/4–20 mA)
• Resolution: 12 bits
• Diagnostic Functions: Channel diagnostics, wire break detection
• Configuration: Via STEP 7 or TIA Portal
• Mounting: DIN rail mounting in S7-300 rack

Technical Specifications

• System Series: SIMATIC S7-300
• Module Type: Analog Input Module (AI 331)
• Number of Inputs: 8
• Input Voltage Range: ±10 V
• Input Current Range: 0 to 20 mA / 4 to 20 mA
• Resolution: 12 bits
• Input Type: Differential
• Diagnostic Features: Yes (including wire break detection)
• Power Supply: Via backplane bus
• Dimensions (W × H × D): 40 mm × 125 mm × 120 mm
• Operating Temperature Range: 0 °C to +60 °C
• Protection Class: IP20
• Certifications: CE, cULus, FM

Application Areas

• Acquisition of analog sensor signals in process and factory automation
• Monitoring of physical parameters such as temperature, pressure, flow
• Integration into SIMATIC S7-300 PLC systems for industrial control
• Applications requiring multiple high-resolution analog inputs

Advantages

• High channel density for space-saving design
• Supports both voltage and current input types for flexibility
• Reliable diagnostics improve system uptime
• Seamless integration with Siemens STEP 7 and TIA engineering tools