Siemens 6ES7 331-1KF01-0AB0 Analog Input Module

Siemens 6ES7 331-1KF01-0AB0 Analog Input Module is an eight-channel analog input card for the SIMATIC S7-300 backplane, delivering 13-bit resolution per channel. The SM 331 module provides eight optically isolated inputs capable of handling voltage, current (4-20 mA), resistance, and RTD sensors, including Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni1000, and Cu10, with an overall update time of approximately 66 ms per module. Used to bring analog transducer signals into a PLC, it supports field wiring with isolation to protect the CPU and reduce interference. The device is designed for applications such as temperature monitoring with RTDs, process control sensors, and multi-channel measurement tasks in automation systems, enabling reliable data capture from multiple sensors on a single rack. Compatible with the SIMATIC S7-300 ecosystem, it fits the SM331 family and is referenced by Siemens part number 6ES7 331-1KF01-0AB0.