Siemens 6ES7331-7SF00-0AB0 S7-300 IO Module SM 331

Siemens 6ES7331-7SF00-0AB0 is a SIMATIC S7-300 SM 331 analog input module with galvanic isolation, designed to read temperature sensors in hazardous areas, offering 8 AI thermocouples or 4 AI Pt100 RTD inputs. It mounts in an S7-300 rack, connects via a 1 x 20-pole interface, and is powered from a 24 V DC supply with typical power dissipation of 0.6 W. The module is diagnostic-capable and PTB-tested for Ex environments, delivering certified performance and fault-detection capabilities for process-temperature monitoring in chemical plants, oil and gas facilities, and other safety-critical installations. Lifecycle information notes a product phase-out with an announcement date of October 1, 2023.