Characteristics of the OPB720 Reflective Swritch Application Bulletin 232
The OPB720 series of reflective switches are designed for operation in areas that have a reasonable amount of ambient light. The OPA720 sensor is NOT affected by ambient light in most conditions. The device is designed with an internal optical driver that synchronizes the LED and Photosensor using a synchronous driver detection scheme to minimize the effects of ambient light.
The OPB720 Series reflective switches detects objects as far away as 30” (76 cm) using standard 90% reflective material, and can detect objects as small as 0.08” (2 mm) in close proximity of the device. The OPB720 series consists of three standard reflective switching distances OPB720A-06Z for typically 6” (15 cm), OPB720A-12Z for typically 12” (30 cm) and OPB720A-30VZfor typically 30” (76 cm).
This sensor has a logical output that switches from a high level with reflective target to a low level with no reflection target. With the addition of hysteresis, the OPB720 series minimizes switching oscillations on the output. The type of material used for the target is very dependent on the distance that can be achieved for the sensor. Taking this into consideration, the OPB720 series can be used in either a reflective or interruptive mode. As an example, the OPB720-12Z can easily be used in a reflective mode for distances around 12” (305 mm) while when reflecting off of a retro-reflective target (similar to 3M 3870 or Nippon Crystallite) at distances around 85” (216 mm) the device operates well in the interruptive mode. See the included charts for typical distances with different reflective material for other versions of the OPB720 series devices.
The OPB720 series has an NPN open collector output drive transistor with power requirements compatible to most PLCs and TTL gates.
●OPB720A-06Z, Typical Reflective distance 6” [15 cm]
●OPB720A-12Z, Typical Reflective distance 12” [30 cm]
●OPB720A-30VZ, Typical Reflective distance 30” [76 cm]
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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11/2016 |
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785 KB |
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