The Pilz PSEN ml b 1.1 Unit (570400) is a safety switch with guard locking, developed to provide reliable protection for operators by ensuring that access to hazardous machine areas is safely controlled. Designed as part of the PSENmlock family, this device combines guard monitoring with solenoid-based guard locking, making it a robust choice for safety-critical applications in modern automation systems.

At its core, the PSEN ml b 1.1 provides guard locking functionality to prevent machine guards, gates, or access doors from being opened while dangerous processes are still running. This ensures operators cannot access hazardous areas until machinery has come to a complete standstill, meeting stringent requirements for personnel protection. Its combination of monitoring and locking functions reduces the need for multiple devices, simplifying system design while ensuring high levels of safety.

The unit operates on a 24 V DC supply with a low power consumption of only 1 W, making it energy-efficient and easy to integrate into existing industrial control systems. With two monitored inputs, it offers reliable feedback of both the guard’s position and the locking mechanism’s status. This dual-channel monitoring approach improves fault tolerance and ensures compliance with international safety standards such as EN ISO 13849 and IEC 62061.

A key advantage of the PSEN ml b 1.1 is its use of two OSSD (Output Signal Switching Device) outputs, which provide safe, monitored switching signals for integration with safety controllers, such as Pilz’s PNOZmulti small controllers or PNOZsigma safety relays. OSSD outputs ensure fault detection, including short circuits and cross-circuits, offering enhanced reliability compared to conventional contacts. This makes the device particularly suitable for applications requiring high diagnostic coverage.

Engineered for industrial durability, the PSEN ml b 1.1 is designed to operate in challenging environments while maintaining consistent performance. Its compact design supports straightforward mounting on machine guards or access gates, and its robust build ensures a long service life even under frequent operation.

Typical applications include machinery where guard locking is essential, such as packaging equipment, robotic cells, assembly lines, and material handling systems. By preventing premature access, the switch protects operators from risks associated with moving parts, high-inertia machinery, or hazardous processes, while also safeguarding the equipment itself from damage caused by unintended interruptions.

In summary, the Pilz PSEN ml b 1.1 Unit (570400) delivers a compact, energy-efficient, and robust safety switch with integrated guard locking. With its 24 V DC operation, dual OSSD outputs, and monitored inputs, it provides a reliable solution for securing access points and protecting personnel in industrial automation environments. Trusted for its dependability and compliance, it forms a key component in modern machine safety systems.