Microelectronics

Building a Programmable Logic Controller with a PIC16F648A by Murat Uzam

By Murat Uzam

Programmable common sense controllers (PLCs) are broadly utilized in to accomplish automation projects, with brands supplying various PLCs that range in features, software stories, and the variety of inputs/outputs (I/O). no longer unusually, the layout and implementation of those PLCs have lengthy been a mystery of brands. Unveiling the mysteries of PLC expertise, development a Programmable common sense Controller with PIC16F648A Microcontroller explains the best way 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 global journal among 2008 and 2010. This ebook is predicated on a more robust 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 numerous macros
Flowcharts that can assist you comprehend the macros (functions)
In this publication, the writer offers specified motives of and software program constructions. He additionally describes PIC meeting macros for all simple PLC capabilities, that are illustrated with a number of examples and flowcharts. An accompanying CD includes resource records (.ASM) and item records (.HEX) for all the examples within the e-book. It additionally provides revealed circuit board (PCB) (Gerber and .pdf) records that you should 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 particular ebook is written for complicated scholars, practising engineers, and hobbyists who are looking to methods to construct their very own microcontroller-based PLC. It assumes a few prior 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 an MPLAB built-in improvement atmosphere.

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Additional info for Building a Programmable Logic Controller with a PIC16F648A Microcontroller

Example text

2 and bI0. 2. As explained before, the input information taken from the macro is rated as bouncing information, and therefore these 16-bit data are stored in bI0 and bI1 registers. 4,bI0. Then, this will take four 8-bit bouncing input data from the 74HC/LS165 ICs and put them to the four successive registers starting with the register bI0. In the second task within this macro, each bit of bI0,i (i = 0, 1, …, 7) is debounced by the macro dbncr0, and each debounced input signal is stored in the related bit I0,i (i = 0, 1, …, 7).

This is simply 27 Basic Software begin Y L2 N SET DBNCRRED0,num Y ? regi,biti = 1 N ? rego,bito = 0 N N L4 ? regi,biti = 0 ? t_reg,t_bit = 1 DBNCR0+num 00h Y N N N N Y SET DBNCRRED0,num ? t_reg,t_bit = 1 DBNCRRED0, ? num = 1 Y RESET DBNCRRED0,num (DBNCR0+num) = (DBNCR0+num) + 1 DBNCR0+ ? num=tcnst_01 N Y Y DBNCRRED0, ? num = 1 L3 ? t_reg,t_bit = 1 Y ? t_reg,t_bit = 1 Y RESET DBNCRRED0,num (DBNCR0+num) = (DBNCR0+num) + 1 N N Y DBNCR0+ ? 13 The flowchart of the macro dbncr0. done by changing the related time constant tcnst_01 or tcnst_10 defining the debouncing time delay for each channel and for both edges within the assembly program.

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. It represents the output signal, which is the debounced version of the input signal. dt1 = the period of (t_reg,t_bit) × tcnst_01 and dt2 = the period of (t_reg,t_bit) × tcnst_10, respectively.

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