POSITAL diverse-redundant absolute encoders designed for safety-critical applications.
Sensor manufacturer POSITAL introduced a line of diverse-redundant absolute encoders, based on non-certified standard components, to augment its existing range of certified SIL safety encoders. According to the company, the devices are suitable – when combined with functional safety PLCs – for applications that must conform to Performance Level/ PL d, Cat. 3 of ISO 13849. The encoders contain two independent sensor systems, one magnetic and one optical; measurements from these two systems are processed by a functional safety PLC. If both measured values are the same (within defined tolerances), safe operation is assumed. If they deviate, the controlling PLC triggers an alarm and can transition the system to a defined safe condition.