Siemens 6ES7131-4BD01-0AA0 Digital Input Output Module

Siemens 6ES7131-4BD01-0AA0 is a 24 VDC digital I/O signal module for the SIMATIC S7-300 programmable logic controller family. It combines eight digital inputs and eight digital outputs in a single module to interface discrete field devices—sensors, switches, indicator lights, relays, and contactors—with the PLC, enabling mixed input sensing and output actuation in manufacturing lines, packaging machinery, conveyors, and process plants. The module is designed for PB-bus rack installation in an S7-300 rack, features LED indicators on each channel, and provides 24 V DC input and 24 V DC output with positive logic inputs and transistor (PNP) outputs. It supports up to ~0.5 A per channel, with a total module output current of ~4 A, and an IP20-rated housing suitable for industrial environments with an industrial specification operating temperature range. Common replacements include Siemens 6ES7132-4BD01-0AA0 and 6ES7131-4BD00-0AA0, reflecting its role within the SIMATIC S7-300 digital I/O module lineup.