By Murat Uzam
Programmable common sense controllers (PLCs) are greatly utilized in to accomplish automation initiatives, with brands delivering various PLCs that range in features, software thoughts, and the variety of inputs/outputs (I/O). no longer strangely, the layout and implementation of those PLCs have lengthy been a mystery of brands. Unveiling the mysteries of PLC know-how, development a Programmable good judgment Controller with PIC16F648A Microcontroller explains how one can 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 international journal among 2008 and 2010. This publication is predicated on a better model of the undertaking, including:
Updates to the configuration, with a smaller CPU board and I/O extension forums that now aid 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 certain reasons of and software program constructions. He additionally describes PIC meeting macros for all uncomplicated PLC services, that are illustrated with a variety of examples and flowcharts. An accompanying CD includes resource records (.ASM) and item documents (.HEX) for all the examples within the e-book. It additionally offers published circuit board (PCB) (Gerber and .pdf) documents for you to have the CPU board and I/O extension forums produced via a PCB producer or produce your individual boards.
Making PLCs extra simply available, this certain publication is written for complicated scholars, practising engineers, and hobbyists who are looking to construct their very own microcontroller-based PLC. It assumes a few prior wisdom of electronic common sense 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 surroundings.
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Additional resources for Building a Programmable Logic Controller with a PIC16F648A Microcontroller
This applies to all eight inputs I0 – eight outputs Q0. 7, respectively. inc, included within the CD-ROM attached to this book, contains all macros defined for the PIC16F648A-based PLC. The contact and relay-based macros are defined to operate on Boolean (1-bit) variables. The working register W is utilized to transfer the information to or from the contact and relay-based macros, except for macros in_out and inv_out. Let us now briefly consider these macros. 1. 1 shows the macro ld and its flowchart.
The serial data going to the I/O extension board(s) are sent out from the SER OUT (pin 18) of the TPIC6B595. The PCB design files of both the CPU board and the I/O extension board can be obtained from the CD-ROM attached to this book. 3. 6, respectively. Thus, in total there are 16 inputs and 16 outputs. 7 shows the PIC16F648A-based PLC consisting of a CPU board, I/O extension boards, 12 V DC adapter, and USB PIC programmer. 2 Basic Software In this chapter, the basic software of the PIC16F648A-based PLC is explained.
If the output signal (rego,bito) = 0 and the input signal (regi,biti) = 1, then with each rising edge of the reference timing signal t_reg,t_bit the related counter DBNCR0+num is incremented by one. In this case, when the count value of DBNCR0+num is equal to the number tcnst_01, this means that the input signal is debounced properly and then state change from 0 to 1 is issued for the output signal (rego,bito). Similarly, if the output signal (rego,bito) = 1 and the input signal (regi,biti) = 0, then with each rising edge of the reference timing signal t_reg,t_bit the related counter DBNCR0+num is incremented by one.
Building a Programmable Logic Controller with a PIC16F648A Microcontroller by Murat Uzam