Schmersal RSS 36-D-ST Safety Sensors

Schmersal RSS 36-D-ST Overview

The Schmersal RSS 36-D-ST is a robust and highly reliable RFID-based electronic safety sensor (or safety switch) designed for machine guarding and safety applications. It's part of the RSS 36 series, known for its compact design, high coding level, and suitability for applications requiring a high safety integrity level. Unlike traditional mechanical safety switches, the RSS 36-D-ST operates contactlessly, making it ideal for applications with frequent door openings or where mechanical wear is a concern.

Product Detailed Description

• Function:

• Monitors the position of safety guards, such as doors, flaps, or covers, on machinery.

• Uses RFID (Radio-Frequency Identification) technology for non-contact detection of the actuator (which is attached to the guard).

• Ensures that machines can only operate when the safety guard is closed and locked (if integrated with a solenoid interlock, though the RSS 36-D-ST itself is a sensor, not an interlock).

• Provides two safety outputs (OSSD - Output Signal Switching Device) that are switched off when the actuator is not detected, safely interrupting the safety circuit.

• Features a diagnostic output for status indication and troubleshooting.

• Features:

• RFID Technology: Contactless and wear-free operation, providing a high level of manipulation protection due to the individual coding of the actuator.

• High Coding Level: "Individually Coded" versions (like the "ST" suffix often implies) mean each sensor is paired with a unique actuator, preventing bypass attempts.

• Compact Design: Small footprint allows for flexible installation even in confined spaces.

• High IP Rating: IP69 protection class (and often IP67), making it resistant to dust, water jets, and even high-pressure/high-temperature washdowns, suitable for harsh environments like the food industry.

• Plastic Housing: Durable and often resistant to chemicals.

• LED Status Indication: Integrated LEDs provide clear visual feedback on sensor status, enabling quick diagnosis.

• Series Wiring Capability: Multiple RSS 36 sensors can often be wired in series, simplifying installation and reducing wiring costs for applications with multiple safety doors.

• Safety Outputs (OSSD): P-switching (PNP) safety outputs for direct connection to safety controllers or safety relays.

• Suitable for High Safety Levels: Can be integrated into applications up to PL e (Performance Level e) according to EN ISO 13849-1 and SIL 3 (Safety Integrity Level 3) according to IEC 61508.

Product Parameters

(Note: These are typical parameters for the RSS 36-D-ST. Always refer to the official Schmersal datasheet for the precise model for definitive specifications.)

• Operating Principle: RFID (Radio-Frequency Identification)

• Safety Outputs (OSSD): 2 x OSSD (p-switching, PNP)

• Diagnostic Output: 1 x PNP

• Supply Voltage (Ue): 24 VDC (-15% / +10%) (stabilized PELV power supply recommended)

• Operating Current (no-load): Typically < 50 mA (exact value varies)

• Max. Output Current (OSSD): Typically 100 mA per output

• Sensing Distance (Sao/Sar): Typically 1 mm / 10 mm (actuator approach direction dependent). The exact values for switch-on and switch-off distances (Sao/Sar) are crucial and can be found in the datasheet.

• Actuator Type: Specific RSS 36 series RFID actuators (e.g., RSS 36-A-ST).

• Protection Degree: IP69 (and typically IP67 according to EN 60529)

• Housing Material: Plastic (often reinforced thermoplastic)

• Operating Temperature: -25 °C to +70 °C

• Connection: 8-pin M12 connector (common for "D" suffix)

• Safety Classifications:

• PL (Performance Level): Up to PL e (according to EN ISO 13849-1)

• SIL (Safety Integrity Level): Up to SIL 3 (according to IEC 61508)

• PFHd (Probability of Dangerous Failure per Hour): Very low, typically in the range of 2.70 x 10⁻¹⁰ /h

• PFDavg (Average Probability of Failure on Demand): Very low, typically in the range of 2.10 x 10⁻⁵

• Coding: Individually coded ("ST" for "Standard") or uniquely coded (for specific versions). The "ST" typically refers to the actuator coding type which is unique.

Product Advantages

• High Level of Safety: Meets the highest safety standards (PL e, SIL 3) for demanding safety applications.

• Manipulation Protection: RFID technology with individual coding significantly reduces the risk of manipulation or bypassing the safety function.

• Wear-Free Operation: Non-contact principle eliminates mechanical wear, leading to a longer service life and reduced maintenance compared to mechanical switches.

• High Resistance to Harsh Environments: IP69 rating ensures durability in challenging conditions involving dust, water, and cleaning agents.

• Compact and Flexible: Small size allows for easy integration into various machine designs, even where space is limited.

• Easy Diagnostics: LED indicators and diagnostic output simplify troubleshooting and reduce downtime.

• Cost-Effective Wiring: Capability for series wiring saves time and material during installation, especially for machines with multiple guards.

• Tolerance to Misalignment: The RFID principle often tolerates slight misalignment between the sensor and actuator, simplifying installation.

Precautions

• Correct Actuator Pairing: Ensure that the correct and individually coded actuator for the RSS 36-D-ST is used. An unmatched actuator will prevent the safety function from activating.

• Proper Mounting: Mount the sensor and actuator securely and in the correct orientation as specified in the manual. Maintain the specified sensing distances (Sao/Sar).

• Environmental Conditions: Operate within the specified temperature range. While highly resistant to water, avoid prolonged immersion beyond its IP rating.

• Electrical Installation: Follow wiring diagrams meticulously. Ensure a stable and correctly specified 24 VDC PELV power supply. Proper grounding is essential.

• Safety Circuit Integration: Integrate the safety outputs (OSSDs) into a suitable safety control circuit (e.g., connected to a safety relay or safety PLC) that meets the required Performance Level or Safety Integrity Level for the overall machine.

• Electromagnetic Compatibility (EMC): Ensure proper shielding and grounding of cables to minimize electromagnetic interference, especially in environments with high electrical noise.

• Commissioning and Testing: Thoroughly test the safety function after installation and during commissioning to verify correct operation. Regular functional testing should be part of the machine's maintenance schedule.

• Avoid Ferromagnetic Material in Sensing Field: While RFID is generally robust, avoid large amounts of ferromagnetic material directly in the active sensing area between the sensor and actuator, as this could potentially influence performance.

Product Applications

The Schmersal RSS 36-D-ST is broadly applicable in industries requiring high levels of machine and personnel safety, particularly where non-contact, robust, and tamper-proof safety monitoring is crucial.

• Packaging Machinery: Monitoring safety doors, flaps, and covers on packaging lines.

• Food & Beverage Processing: Ideal for applications requiring frequent washdowns and high hygiene standards due to its IP69 rating.

• Pharmaceutical Production: Safety monitoring of machines in cleanroom and sterile environments.

• Machine Tools: Protecting operators from moving parts by monitoring access doors and guards.

• Robotics: Safety interlocking of robot cell access doors and gates.

• Material Handling Systems: Monitoring safety gates on conveyors, automated storage and retrieval systems (AS/RS).

• Automotive Industry: Safety applications in assembly lines and manufacturing processes.

• Woodworking Machinery: Ensuring guards are closed before machine operation.

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