The Leuze MSI-TR2B-01 is a light curtain safety relay and evaluation unit specifically designed for Type 2 single beam safety devices in accordance with IEC/EN 61496. As part of the MSI-TB series, it serves as the critical interface between optoelectronic protective equipment and the machine's safety-related control system. Its primary function is to monitor the output signals from connected safety light curtains, perform continuous diagnostics, and reliably switch the safety outputs to a safe state when the protective field is interrupted or a fault is detected. This ensures compliance with functional safety standards for machinery.

The MSI-TR2B-01 provides a comprehensive set of safety functions and features. It includes two safety-related relay outputs (OSSDs) as normally open (NO) contacts, capable of switching up to 2A each. For enhanced diagnostics and system integration, it also provides solid-state PNP transistor outputs for "Safety ON" status and "Error" indication. The unit supports contactor monitoring (EDM) to verify that external contactors have correctly de-energized, as well as a configurable start/restart interlock (RES) to prevent automatic machine restart after a protective field interruption. The restart behavior can be configured for automatic or manual operation, and a periodic function test continuously verifies the integrity of the safety chain. An additional 130 ms filter time enhances availability by preventing nuisance trips from brief signal disturbances.

From a safety integrity perspective, the MSI-TR2B-01 is certified to Performance Level c (PL c) according to EN ISO 13849-1 and Safety Integrity Level 1 (SIL 1) according to IEC 61508, with an MTTFd of 78 years and a mission time of 20 years. The unit is designed for easy installation and diagnostics. It mounts on a standard DIN rail in a compact 22.5 mm housing and features four LEDs for clear visual status indication. All 16 screw terminals are pluggable and mechanically coded to prevent wiring errors. The MSI-TR2B-01 operates on a 24V DC supply with a wide tolerance range and is certified by TÜV Süd and c TÜV Rheinland US for global regulatory compliance.

The Leuze MSI-TR2B-01 is an ideal safety monitoring solution for applications using Type 2 single beam safety devices. It is commonly deployed in access guarding, point-of-operation protection, and perimeter safeguarding on machinery where Type 2 optoelectronic protective equipment is specified. Its combination of OSSD relay outputs, comprehensive diagnostic features, and international safety certifications makes it a reliable and flexible choice for ensuring operator safety in industrial automation environments.

Technical Specifications