Siemens 6ES7138-4FR00-0AA0 Programmable Logic Controller Module

Siemens 6ES7138-4FR00-0AA0 is a SIMATIC ET 200S fail-safe relay-output module (1F-RO) designed for the DP electronics family within the ET 200S distributed I/O system. It provides a single relay output with two normally open contacts, capable of switching loads up to 5 A. The module accepts a control supply of 24 V DC or 24...230 V AC, aligning with common plant power architectures, while the relay contacts themselves are rated for switching voltages from 24 V DC up to 230 V AC. With a compact 30 mm width, it integrates into expanding digital output configurations in safety-related applications. Built for safety-conscious automation, this 1F-RO module enables fail-safe operation within ET 200S safety configurations, allowing safe shutdown or signaling through its relay outputs. The 6ES7138-4FR00-0AA0 is a dedicated expansion module for SIMATIC DP networks, pairing with compatible controllers to extend digital outputs in safety-critical circuits.