Product Overview

The 6ES7138-4CF02-0AB0 is a specialized failsafe power management module belonging to the SIMATIC ET 200S distributed I/O family. Functioning as a PM-E F PROFIsafe unit, this module is engineered to monitor and safely switch the internal voltage buses (P1 and P2) of a localized terminal segment. It provides the critical interface required to implement safety-instrumented functions within a standard automation rack. By integrating relay-based disconnection and electronic safety outputs, this module allows for the targeted de-energization of downstream load groups in the event of a safety violation, all while maintaining communication via the PROFIsafe protocol over PROFIBUS or PROFINET networks.

Core Architecture and Functional Metrics

• Safety Rating: Achieving up to SIL 3 (IEC 61508) and Category 4 (EN 954-1/ISO 13849-1)

• Nominal Supply: 24V DC (Suitable for ungrounded reference potentials)

• Safety Interfaces: 2 Failsafe Digital Outputs (F-DO) integrated for safety circuit control

• Bus Switching: Relay-driven safety-related disconnection of P1 and P2 voltage buses

• System Integration: Compatible with IM 151-3 HF and other high-feature ET 200S interface modules

• Module Width: 30 mm

• Operational Weight: 0.24 kg

• Casing Dimensions: 10.5 cm x 12.5 cm x 4.0 cm

• Diagnostics: LED status indicators for group faults and safety-related status

Specialized Automation Scenarios

This PROFIsafe power module is a staple in modern decentralized safety architectures, specifically in the following fields:

• Safety Segment Power Management: Creating distinct safety zones within an ET 200S station to isolate specific motor starters or output modules without shutting down the entire PLC.

• Emergency Stop Circuits: Serving as the executive switching element for E-stop loops, ensuring that power is removed from hazardous actuators via the P1/P2 buses.

• Robotic Workcell Protection: Coordinating with light curtains and interlocks to provide SIL 3 level safety for digital outputs controlling robotic grippers or movement.

• Material Handling Safety: Implementing safety-related stops for conveyor lines and sortation systems using distributed I/O nodes.

• Process Plant Isolation: Managing the safe state of solenoid valves and auxiliary equipment in hazardous processing areas.