|

Photoelectric Sensors

Pressure Sensors

Displacement Sensors

Optical Micrometers

Digital Microscopes

Barcode Readers



Light Curtains

Safety Measures
	Safety Device Safety Measue Categories
	Identification of Risk Sources
	Three Key Points for Protection Against Mechanical Hazards
	Grounding Instructions by Output Form (NPN/PNP)
	Basic Safety Circuit Concepts
Safety Regulations
	Machinery Safety Standards
	Calculation Example of Safe Distance

Protective Structures

	About Protective Structure


Light Curtain Systems

	Overview
	Safety Light Curtain with Visible/Identifiable Indicator
	Finger/Hand Detection
	No Dead Zone Safety Light Curtain
	Heavy Duty Safety Light Curtain
	Quick Connect Safety Controller
	Safety Laser Scanner

Keyence Product Information Site

	Light Curtain

Grounding Instructions by Output Form (NPN/PNP)

Grounding wires of devices or equipment are connected to the 0 V side in many cases.
When connecting to a 0 V plane, PNP output must be selected in order to meet the safety standard. Following are the reasons.

An Example of Using NPN Output


	If this part is disconnected and ground fault occurs, the voltage drops from 24 V to 0 V and power is continuously input to the connected equipment regardless of whether the switch is turned on or off, causing danger to the user.

An Example of Using PNP Output


	Even if this part is disconnected and ground fault occurs, the voltage is maintained at 0 V and no power is input to the connected equipment regardless of whether the switch is turned on or off. Therefore, it is safe.

More on this topic...



	A Desktop Reference for Sensors, Vision Systems and Measuring Instruments.

	Keyence has just released a new, very useful safety guide



		Ideal Product for Palletizer Safety Control



		Click here to ask our Photoelectric Sensors experts a support question.



Need price information? Click Here

	Page Top

Copyright(c) 2010 KEYENCE CORPORATION. All rights reserved.	\| Privacy \| Terms of Use \| Contact \| Produced by