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不同类型传感器的兼容性问题
发布时间:2017-03-08
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There are many compatibility problems using different type of sensors. For example we usually heard questions like “My sensor type is NPN, is that compatible with PCI-17XX?”
This FAQ will show how to choose an appropriate digital input board for different sensor types.
 
Here are typical designs of the NPN and PNP sensors:
1. NPN sensor 
Provide low level (0V)when conduction. Current will low from the positive to negative end of the device.
 
2.PNP sensor
Provide high level(+V)when conduction. Current will flow from the negative to positive end of the device.
 
 
Brief Solution - Step by Step:
1.For wet contact application if the type of DI is TTL,thesensor type could only be PNP sensor so that wecould connect one end to GND and another to the sensor output.(Dix to output, DGND to GND)
2.For wet contact application with isolation DI, the sensor type could bePNP and NPN because isolation digital input implements bi-directional conduction. You could connect ECOM to either high(+V) or low(0V).( IDIx to output, ECOM to +V for NPN or IDIx to output, ECOM to GND for PNP)
3.For dry contact application, you could only connect NPN sensor for application since PNP sensor will provide high level when conduction.This could be apply to both TTL and isolated digital input.

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