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Building a Programmable Logic Controller with a PIC16F648A by Murat Uzam

By Murat Uzam

Programmable good judgment controllers (PLCs) are greatly utilized in to accomplish automation projects, with brands providing quite a few PLCs that range in capabilities, application stories, and the variety of inputs/outputs (I/O). now not unusually, the layout and implementation of those PLCs have lengthy been a mystery of brands. Unveiling the mysteries of PLC know-how, Building a Programmable common sense Controller with PIC16F648A Microcontroller explains tips to layout and use a PIC16F648A-microcontroller-based PLC.

The writer first defined a microcontroller-based implementation of a PLC in a sequence of articles released in Electronics World journal among 2008 and 2010. This booklet is predicated on a much better model of the undertaking, including:

  • Updates to the configuration, with a smaller CPU board and I/O extension forums that now help sixteen inputs and sixteen outputs rather than 8
  • An elevated clock frequency of 20 MHz
  • Improvements to a number of macros
  • Flowcharts that will help you comprehend the macros (functions)

In this publication, the writer offers distinctive motives of and software program buildings. He additionally describes PIC meeting macros for all simple PLC features, that are illustrated with a variety of examples and flowcharts. An accompanying CD includes resource documents (.ASM) and item records (.HEX) for all the examples within the booklet. It additionally offers revealed circuit board (PCB) (Gerber and .pdf) documents that you can have the CPU board and I/O extension forums produced via a PCB producer or produce your personal boards.

Making PLCs extra simply available, this specified ebook is written for complex scholars, working towards engineers, and hobbyists who are looking to construct their very own microcontroller-based PLC. It assumes a few past wisdom of electronic good judgment layout, microcontrollers, and PLCs, in addition to familiarity with the PIC16F sequence of microcontrollers and writing courses utilizing PIC meeting language inside of an MPLAB built-in improvement environment.

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Example text

It is well known that inputs taken from contacts always suffer from contact bouncing. To circumvent this problem we define a debouncing mechanism for the inputs; this will be explained later. In the get_inputs stage of the PLC scan cycle, the input signals are serially taken from the related 74HC/ LS165 registers and stored in the SRAM registers. As a result, bI0 and bI1 will 13 Basic Software hold these bouncing input signals. After applying the debouncing mechanism to the bouncing input signals of bI0 and bI1 we obtain debounced input signals, and they are stored in SRAM registers I0 and I1, respectively.

However as explained before, in this book we restrict this number to 2, because we have 16 discrete outputs. var0 is the beginning of the 8-bit registers, such as Q0 in SRAM from which the state of outputs are taken and serially sent out to TPIC6B595 registers. 7 The macro HC595. be enough SRAM locations reserved after var0, and also there should be enough TPIC6B595 registers to hold the outputs. There are some explanations within the macro to describe how it works. As can be seen, this macro makes use of previously defined data_out, clock_out, and latch_out bits to send the output signals serially to TPIC6B595 registers.

It is used to define the 8-bit variable “DBNCR1+num” and the edge detector bit “DBNCRRED1,num”. 7. It defines the timing period. tcnst_01: An integer constant value from 1 to 255. Debouncing time 1 (dt1) is obtained by this formula: dt1 = the period of (t_reg,t_bit) × tcnst_01. tcnst _10: An integer constant value from 1 to 255. Debouncing time 2 (dt2) is obtained by this formula: dt2 = the period of (t_reg,t_bit) × tcnst_10. OUT(rego,bito): A Boolean variable passed out of the macro through rego,bito.

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