We will use the most widely used pnp transistor for our circuit the 2n3906. Generally the pnp transistor can replace npn transistors in most electronic circuits the only difference is the polarities of the voltages and the directions of the current flow.
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Pnp transistor wiring diagram. When connecting to the plc the plc input acts as the load. The pnp transistor like almost all transistors is a 3 lead device. Pnp transistor symbol the symbol of p n p consists of three terminals emitter base and the collector. Heres a simple way remember how to wire up a 3 wire dc pnp or npn sensor. Zener voltage regulator circuit this is one of the two configurations of overvoltage protection circuits using zener diode. You will notice that the load appears between the 0v blue and switching wire black.
Either the load is connected to negative and the positive is switched pnp continue reading an easy way to remember pnp and npn sensor. The 0v blue will be attached to the common input and the switching wire black will be attached to the input number. The pinout for a fmmt718 is given in a tabular form below. Pnp transistors can also be used as switching devices and an example of a pnp transistor switch is shown below. Going from a back view the first lead is the emitter the second lead is the base and the third lead is the collector. The arrow is sharply pointing towards the base indicating the flow of current from the emitter terminal to the base.
A schematic diagram of the pnp transistor is given below. Symbol of p n p transistor. Pnp switched positive npn switched negative switched refers to which side of the controlled load relay small indicator plc input is being switched electrically. The following is a wiring diagram of an open collector pnp sensor.
Gallery of Pnp Transistor Wiring Diagram
