Grey case: Open the ED case using a small flat head screw driver pushed into the sides of the case which connects the lid to the case base and find the jumper with PNP and NPN next to it.Slide the PCB out and find the jumpers with PNP and NPN next to it. Yellow case: Open the ED case using a small flat head screw driver pushed into the sides of the product which connect the yellow lid to the lower case. To set these inputs there are a series of jumpers on the board. Our ED range can be set to accept either NPN or PNP signals on each input. The transmitter is powered on when there is no current at the base of the transistor. The higher the current the more an NPN transistor will be powered on.Ī PNP transistor is the opposite, current flows from the collector to the emitter. The transmitter is powered on when sufficient current is supplied to the base of the transistor. In a NPN transistor, current flows from the emitter to the collector. To connect to a sensor you will need to be able to match the type of signal the device uses. Sensors are an example of devices that can be either NPN or PNP. NPN or PNP typically relates to digital signals. On an IO Module, a PNP input, when undriven is pulled up to a high state e.g. PNP stands for Positive, Negative, Positive. On an IO Module, an NPN input, when undriven is pulled down to be in a low state, GND ( or reference voltage level e.g. NPN stands for Negative, Positive, Negative. This FAQ explains NPN and PNP transistors and what it means for sensors and IO module inputs.
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