More Control Systems:Microcontroller

Microcontroller

For comparison with other control technologies, Figure 14.10 shows the same machine tool operated by a microcontroller. As we know, the microcontroller uses signal levels around 5 V, so the input switches have to be connected with pull-up resistors. The microcontroller is programmed to operate the output loads via suitable interfaces, which allow its outputs to switch the high-power motors. These could be relays or three-phase contactors, but high- current field effect transistors (FETs) are useful here, as they can operate with 5 V inputs and have no moving parts. The microcontroller can be programmed in its native assembler

PIC Microcontrollers-1347

PIC Microcontrollers-1348

language (Program 14.2), or C, both of which take time to learn. This is why ladder logic was developed for programming PLCs, and the built-in interfacing in the PLC makes this the usual choice for such control applications.

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