Siemens 6ES7138-4FR00-0AA0 plc Controller

The Siemens 6ES7138-4FR00-0AA0 is a fail-safe relay output module (1F-RO) for the SIMATIC ET 200S distributed I/O system. It provides one relay output with two normally open (2 NO) contacts, rated for 5 A at load voltages of 24 V DC or 24–230 V AC . This module is specifically designed for safety-related applications, achieving up to Category 4 (EN 954-1), SIL 3 (IEC 61508), and PL e (ISO 13849-1) when controlled by a fail-safe output module such as the 6ES7138-4FB02-0AB0 .