■LIGHT INCIDENT:

● Refers to the condition when fight from on emitter is incident upon, or reaching. the receiver

■LIGHT INTERRUPTED:

● Refers to the condition when light from an emitter is not incident

■LIGHT SOURCE:

● Identifies the source and type of light used in the emitter portionof the device.Typically either a pulse modu-lated LED or incandes-cent bulb.May provide infrared. Red green or white light.

■RECEIVER:

● The section of the photoelectric sensor that contains a photosensor and usually a lens.

■SENSING DISTANCE:

● The nominal mazimum distance at which a photoelectric sensor can detect a standard target.

■DETECTABLE OBJECT:

● Identifies the required light transmission properties and mini-mum size dimensions of the object to be detected.

■REVERSE POLARITY PROTEC-TION:

● Interal circuitry that prevents damage to a device in the event that proper potarity is not maintained when making connections to the plus and minus terminals of the device.

■SHORT-CIRCUIT PROTECTION:

● Internal circuitry that prevents damage to a device in the event that the load attached to the output of the device becomes shorted.

■DIFFUSE REFLECTIVE:

● Detection method with emitter(light source) and receiver in a common housing. Light from the emitter is aimed at the target and reflected by the target back to the receiver.

■THRV-BEAM:

● Detection method with emitter (light source) and receiver in separate housings. The emitter is aimed at the receiver.and the object being detected passes between the two.

■RETROREFLECTIVE:

● Detection method with emitter (light source) and receiver in a common housing. Light from the emitter is aimed at a retroreflective target and reflected back to the receiver. The object being detected passes between the emitter/receiver housing and the retroreflective target (reflector).

■EIFFERENTIAL TRAVEL:

● Also called “hysteresis”, differential travel is the property of the sensor that results in the operate point being different from the release point. Typically expressed in “% of detecting distance. “if identifies the distance between the operate point, resulting from the target approaching the bevice. And the release point, result-iing from the same target moving away from the device.

■LIGHT-ON OPERATION:(入光動作)
● A control output mode that will result in the output switching device turing on when light from the emitter is incident upon the receiver.

■DARK-ON OPERATION:
● A control output mode that will result in the output switching de-vice turning on when light from the emitter is not incident upon the receiver (the beam is interrupted).

Operates when light Is incident(LIGHT ON)

Operates when light Is interrupted(DARK ON)

Operates when light Is incident(LIGHT ON)

Operates when light Is interrupted(DARK ON)

■DIRECTIONAL ANGLE:

● Applies to separate and retroreflective types of photoelectric sensors and refers to the angular range within which an emitter,receiver, emitter/receiver or retroreflector can be ratoted about the optical axis and still have the sensor operate. The magnitude of the directional angle is equal to twice the maximum allowable angular rotation above or below the optical axis.

DIRECTIONAL ANGLE:

■DETECTING DISTANCE:

● Refers to the distance range within which the photoelectric switch can detect the detectable object. With separate and retroreflective types, the term denotes the maximum distance within which the photoelectric switch can be set stably. With the diffuse and definite reflection types. The term denotes the maximum distance within which the photoelectric switch can stably operate with the standard detectable object.

Ttru-Beam type:

Retroreflective type:

Diffuse reflection type: