Siemens 6ES7 138-4FB03-0AB0 Programmable Logic Controller Module

Siemens 6ES7 138-4FB03-0AB0 is a four-channel fail-safe digital output module (F-DO) for SIMATIC ET 200S distributed I/O systems. It furnishes four 24 V DC outputs, each rated to 2 A, enabling safe actuation of loads like solenoids, relays, or valve controls in industrial automation. The module is safety-rated up to SIL-3 and includes integrated diagnostics with PM-switching to support reliable, fault-reporting operation in safety-critical applications. As part of the ET 200S/DP family, it integrates with Siemens controllers to extend safety functionality across a distributed I/O network and supports safety circuits in PROFIsafe-enabled systems. The 6ES7 138-4FB03-0AB0 designation identifies a compact, compliant solution for adding safety-rated outputs to control cabinets, ensuring robust fail-safe performance in mid-range automation environments.