Building a Programmable Logic Controller with a PIC16F648A by Murat Uzam

By Murat Uzam

Programmable common sense controllers (PLCs) are greatly utilized in to accomplish automation initiatives, with brands supplying quite a few PLCs that range in features, application stories, and the variety of inputs/outputs (I/O). now not 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 common sense Controller with PIC16F648A Microcontroller explains the 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 international journal among 2008 and 2010. This e-book relies on a stronger 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 booklet, the writer offers certain motives of and software program buildings. He additionally describes PIC meeting macros for all simple PLC capabilities, that are illustrated with quite a few examples and flowcharts. An accompanying CD comprises resource documents (.ASM) and item documents (.HEX) for all the examples within the booklet. It additionally offers published circuit board (PCB) (Gerber and .pdf) documents that you should have the CPU board and I/O extension forums produced by means of a PCB producer or produce your individual boards.
Making PLCs extra simply available, this specified ebook is written for complicated scholars, working towards engineers, and hobbyists who are looking to how to construct their very own microcontroller-based PLC. It assumes a few earlier 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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4 (Continued) Definitions of 1-bit (Boolean) variables: (c) logic values and special bits, (d) definitions for 74HC165 and TPIC6B595. 4 (Continued) Definitions of 1-bit (Boolean) variables: (e) 32 memory bits (internal relays). 4 (Continued) Definitions of 1-bit (Boolean) variables: (f) 16 reference timing signals. 0 Register Temp_2 has the following individual bits: 7 6 5 4 3 2 1 0 SCNOSC FRSTSCN LOGIC1 LOGIC0 LOGIC0: Set to 0 after the first scan. LOGIC1: Set to 1 after the first scan. FRSTSCN: Set to 1 during the first scan and set to 0 after the first scan.

This macro is used as a logical NOT gate. The input is taken from W, and the output is send out by W. When the input variable is 0 (respectively 1), the output (W) is forced to 1 (respectively to 0). 3 (a) The macro not and (b) its flowchart.

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. is also necessary to define eight 8-bit variables in successive SRAM locations, the first of which is to be defined as DBNCR1. 3 Basic Macros of the PIC16F648A-Based PLC In this section the following basic three macros are considered: initialize, get_inputs, and send_outputs.

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