Omron OS32C-SN-4M Type 3 Safety Laser Scanner

The Omron OS32C-SN-4M is a Type 3 safety laser scanner from the OS32C series, designed for area monitoring and personnel protection in industrial automation applications. The OS32C-SN-4M configuration is the sensor block unit without an integrated I/O block, intended for use with external safety controllers or as a replacement sensor for existing OS32C system installations. The scanner provides a 4-meter safety detection range and a 270-degree scanning angle, delivering reliable intrusion detection and access protection for hazardous machinery.

Safety Classification and Certifications

The OS32C-SN-4M is certified as a Type 3 safety laser scanner, complying with IEC 61496-1 (Safety of machinery - Electro-sensitive protective equipment) and IEC 61496-3 (particular requirements for active opto-electronic protective devices responsive to diffuse reflection). The scanner achieves Performance Level PLd and Safety Category 3 according to ISO 13849-1, making it suitable for safeguarding applications where a fault may lead to serious injury and risk reduction requires high diagnostic coverage. The device carries CE marking for European compliance and UL certification for North American installations.

Detection Range and Performance

The safety detection range is up to 4 meters, depending on the configured detection resolution. At the minimum detection resolution of 30 mm, the safety zone operating range is 1.75 meters. At 40 mm resolution, the range extends to 2.5 meters. For detection resolutions of 50 mm or 70 mm, the safety zone range reaches 3.0 meters. The warning zone, which can be configured to alert operators before they enter the safety zone, extends up to 10 meters from the scanner. The detection angle spans 270 degrees, allowing a single scanner to monitor a large area around a machine hazard. The angular resolution is 0.4 degrees, providing fine position accuracy for zone boundary configuration. The laser beam diameter measures 6 mm at the optics cover and expands to approximately 14 mm at a distance of 3 meters.

Field Configurability and Zone Programming

The OS32C-SN-4M supports up to 70 sets of monitoring zone combinations, each consisting of a safety zone and two warning zones. This extensive configuration capability allows the scanner to adapt to complex working environments with changing hazard boundaries, multiple machine access points, or variable operational modes. The configuration tool enables users to draw custom zone shapes, define multiple zone sets that can be switched based on machine state, and configure muting functions that temporarily disable portions of the detection field during non-hazardous operations such as material feeding. The scanner constantly monitors reference points and turns off the safety outputs if a shift in its position is detected, providing protection against accidental or deliberate realignment of the device.

Optical and Scanning Specifications

The laser scanner operates using pulsed laser time-of-flight measurement technology. The scan plane height is 67 mm from the bottom of the scanner, which should be considered during mounting to ensure the detection field covers the intended area at a height suitable for human body detection. Detection resolution is configurable at 30, 40, 50, or 70 mm, where resolution refers to the smallest object diameter that the scanner can reliably detect at the specified operating range. The measurement error is 100 mm at ranges up to 3 meters, increasing to 110 mm at distances exceeding 3 meters up to the 4-meter limit. Response time from detection to safety output de-energization is configurable from 80 milliseconds (2 scans) to 680 milliseconds (17 scans).

Electrical Specifications and Connections

The OS32C-SN-4M operates on a 24 V DC power supply with ±25 percent tolerance. Power consumption is 5 watts maximum during normal operation and 3.75 watts in standby mode when no output load is connected. The safety outputs are PNP transistor outputs (OSSD1 and OSSD2), each rated for a load current of 250 mA maximum, with a residual voltage of 2 volts maximum and leak current of 1 mA maximum. The auxiliary output and warning output are also PNP or NPN configurable, each rated for 100 mA maximum load current. Connection to the scanner is made via an 18-pin mini-connector for power and safety outputs, and an M12 4-pin connector for communication interfaces. The sensor block functions as an Ethernet-compliant safety laser scanner, allowing users to check operating status and analyze the cause of emergency stops via LAN, even in large-scale applications using multiple scanners.

Physical Construction and Environmental Rating

The scanner housing is constructed from die-cast aluminum, providing mechanical rigidity and effective heat dissipation. The optical cover is made from polycarbonate, offering transparency to the laser wavelength while providing impact resistance. The enclosure rating is IP65, providing protection against dust ingress and low-pressure water jets from any direction, making the scanner suitable for wash-down environments and outdoor installation when protected from direct sunlight. Operating temperature range is -10°C to 50°C, with storage temperature from -25°C to 70°C. Humidity tolerance is 95 percent relative humidity maximum non-condensing. Insulation resistance is 20 megohms minimum when tested at 500 V DC. Physical dimensions are 133.0 mm width, 104.5 mm height, and 142.7 mm depth, excluding the cable. The weight of the unit is approximately 1.3 kilograms.

Typical Applications and Integration

The OS32C-SN-4M is used in industrial applications requiring area safeguarding around robots, automated guided vehicles (AGVs), packaging machinery, palletizing cells, and material handling systems. The 270-degree scanning angle allows the scanner to be mounted at a corner or along the side of a machine, covering multiple approach directions with a single device. The configurable zone sets allow the scanner to be integrated with machine operating modes, such as reducing the monitored area during setup or maintenance operations. The scanner can interface with safety PLCs, safety relays, or machine control systems through the OSSD outputs, providing a Category 3 safety-rated stop signal when an intrusion is detected.

Standards Compliance

The OS32C-SN-4M complies with IEC 61496-1 for electro-sensitive protective equipment, IEC 61496-3 for active opto-electronic protective devices utilizing diffuse reflection (AOPDDR), ISO 13849-1 for safety-related parts of control systems, and IEC 61508 for functional safety. The device meets UL 508 for industrial control equipment and carries the CE mark for the European Economic Area. The scanner is RoHS compliant, meeting restrictions on hazardous substances in electrical and electronic equipment.