Compact RFID based electronic safety sensor with multiple actuator styles

Schmersal has applied Radio-frequency identification (RFID) technology in the new RSS260 series electronic safety sensor. The RSS260 is designed for application in safety circuits monitoring the position of hinged, sliding or removable guards using a specifically coded, passive RFID tag in the actuator.

Radio-frequency identification (RFID) is a technology that uses radio waves to provide a wireless data exchange of a coded identification number between a target (tag, label, or chip) and a reader – a device which transmits an encoded radio signal to the target. Schmersal has applied this technology to the RSS260 series non-contact safety sensor. In this application the RFID actuator target is attached to the safety guard door and sensor is attached to the machine frame. The non-contact sensing allows for longer switch life - Since there are no moving parts there is little to no wear on the components. As safety guard panels age, the sensor will also tolerate misalignments, up to 10 mm.

The clear advantage of using RFID technology is enhanced tamper resistance. Since the RSS260 uses a special frequency, the sensor will disregard non-actuator RFID signals, and the passive RFID tag in the actuator will not interfere with other RFID systems such as product trackers. The RSS260 is also difficult to by-pass because it has the option of individual coding: The basic version of the sensor responds to any RST target actuator; The “I1” version only accepts the coded ID number of the specific target actuator which is taught in during the first start-up; The “I2” version allows the teach-in process to be repeated, allowing replacement of a lost or damaged actuator.

The RSS260 series has several actuator targets and accepts two approach directions which allow for mounting flexibility. The standard actuator (RST-260-1) matches the body profile of the switch which fits to regular aluminum profile systems, the RST-16-1 is a very flat, elongated actuator suitable for mounting on Plexiglas safety gates, and the RST-U-1 an extremely compact rectangular target designed for integration into the surrounding construction of the guard door. Any of these targets can approach the sensor from either the front face or the long side.

The RSS260 also features all of the diagnostic advantages of our other electronic safety sensors and solenoid interlocks. It comes standard with LEDs to indicate various errors. For more advanced indication the RSS260 is also available with serial diagnostics to communicate its status via serial data packages for use in various network protocols. Because of an integrated dual monitoring microprocessor, only one switch is required to meet PLe per ISO 13849-1 and SIL3 per IEC 62061. The RSS260 can be connected in series with other electronic sensors and locking switches, up to 31 devices, without loss of signal or safety level when monitored with a number of standard Schmersal safety controllers.

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