Multizone safety laser scanner
|See other articles from Control Engineering December 2009 North American print edition.|
New SafeZone Multizone Series B safety laser scanner from Rockwell Automation is designed to protect personnel in automated robot and assembly applications by detecting objects or people in its sensing field. SafeZone Multizone laser scanner emits pulses of eye-safe infrared laser light over a 190-degree arc, then receives and processes the light reflected from intrusions in the sensing field to determine the position and distance to the object. When an object is detected, the scanner sends a stop signal to the protected machine. Each of four switchable detection zones can be customized within the maximum scanning range for the application. It is certified for vertical and horizontal guarding applications and offers configurable resolutions (30 mm, 40 mm, 50 mm, 70 mm, and 150 mm) that allow many detection configurations for stationary and mobile applications. The safety field is configurable for a 5 m range over 190 degrees; the warning field can be set for up to a 49 m radius (depending on object reflectivity). The scanner can be configured to increase the number of samplings (from 2 to 16) within the defined field to accommodate environmental or operational conditions, such as weld sparks, helping to minimize nuisance tripping. A configurable restart delay (from 2 to 60 seconds) allows the machine to start automatically after the field is clear for a specified amount of time. Zone configuration is faster and easier with Microsoft Windows-based SCD software supplied. To help simplify troubleshooting, it has a seven-segment display along with several LEDs for quick and easy diagnosis of the device’s operational status or fault condition. The front window of the scanner is field-replaceable, should it become damaged or scratched.