If we talk about industrial automation we will find different terms related to the design of the internal circuit and the type of transmitter. PNP and NPN are two so-called bipolar or called (BJTs) transistors. These transistors that are controlled by current allow basically the amplification of the same through the circuit. Both PNP and NPN have the same function, provide amplification of the currentAnd/or switching. The only difference between them is the way in which the current or energy is assigned to each of its connectors.

• PNP (sinking or Pointing iN Proudly) is one of the types of transistors most used in electrical circuits, this type of transistor differs in that it receives positive voltage at its emitter terminal and negative voltage at its base terminal. Positive voltage to the transmitter allowsThe current flows from the emitter to the collector, since there is negative current to the base. As the voltage goes down from the base the transistor is on and conducts through the power at the output load.
• NPN (Sourcing or Not Pointing iN) is another transistor, unlike the PNP it is faster in its switching, since it works with reference 0V, it has less immunity to the noise and a smaller fall of tenZion. This type of transistor works in a completely opposite way to PNP. The NPN transistor receives positive voltage at the collector terminal. This positive voltage allows current to flow through the collector to the emitter, as there is enough base voltage to power the transistor. As the current increases at the base, the transistor is activated more and more until it is completely driven from the collector to the emitter and encoderGo the circuit. The opposite happens when the voltage decreases from the base, until the current is so low that the transistor no longer leads through the collector to the emitter and shuts off.

ExpressCard is a hardware standard replacing the PCMCIA/PC Card/CardBus cards, both developed by the Personal Computer Memory Card International Association. The host device supports PCI-Express and USB 2.0 connectivity in the ExpressCard slot, and each card uses the mode of connectivity the designer considers more appropriate for the task. The cards can connect to the computer on without RESETiarlo (support Hot swap or hot plug). It is an open standard of the ITU-T and its definition can be obtained from the official website of ExpressCard. You can connect to this bus, different types of peripherals such as Wi-Fi cards, Bluetooth, TV cards, FireWire, etc.

A Peripheral Component Interconnect (PCI, "Peripheral Component Interconnect") is a bus (picture 2) computer standard for connecting peripheral devices directly to your motherboard. Dimensions of the cards - PCI (standard) 107 mm x 312 mm (picture 1) - PCI Low Profile Height: 36.07 mm x 64.41 mm Depth: 119.91 mm to 167.64 mm - Mini PCI Mini PCI cards have a Maximum consumption2W.