By Murat Uzam
Programmable common sense controllers (PLCs) are commonly utilized in to accomplish automation initiatives, with brands supplying various PLCs that fluctuate in capabilities, application thoughts, 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 expertise, construction a Programmable good judgment 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 chain of articles released in Electronics global journal among 2008 and 2010. This ebook is predicated on a higher 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 will help you comprehend the macros (functions)
In this e-book, the writer offers particular reasons of and software program constructions. He additionally describes PIC meeting macros for all simple PLC capabilities, that are illustrated with various examples and flowcharts. An accompanying CD comprises resource records (.ASM) and item documents (.HEX) for the entire examples within the publication. 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 way of a PCB producer or produce your individual boards.
Making PLCs extra simply available, this designated booklet is written for complicated scholars, working towards engineers, and hobbyists who are looking to easy methods to construct their very own microcontroller-based PLC. It assumes a few past 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 an MPLAB built-in improvement surroundings.
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Extra resources for Building a Programmable Logic Controller with a PIC16F648A Microcontroller
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. If the input signal (regi,biti) = 0 and the output signal (rego,bito) = 0 or the input signal (regi,biti) = 1 and the output signal (rego,bito) = 1, then the related counter DBNCR0+num is loaded with 00h and no state change is issued.
For this macro it is necessary to define the following 8-bit variables in SRAM: Temp_1 and DBNCRRED1. Each bit of the variable DBNCRRED1 is used to detect the rising edge of the reference timing signal t_reg,t_bit for the related channel. 15 The macro dbncr1. 2 Schematic Symbol of the Macro dbncr1 dbncr1 regi,biti IN OUT num t_reg,t_bit tcnst_01 tcnst_10 rego,bito IN (regi,biti): A Boolean variable passed into the macro through regi,biti. It represents the input signal to be debounced. num: Any number from 0 to 7.
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. This macro has a Boolean input variable passed into it as reg,bit and a Boolean output variable passed out through W.