By Murat Uzam

Programmable common sense controllers (PLCs) are largely utilized in to accomplish automation projects, with brands supplying a number of PLCs that range in capabilities, 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 expertise, construction a Programmable common sense Controller with PIC16F648A Microcontroller explains easy methods 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 booklet is predicated on a far better model of the venture, 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 numerous macros
Flowcharts that will help you comprehend the macros (functions)
In this ebook, the writer presents special causes of and software program constructions. He additionally describes PIC meeting macros for all uncomplicated PLC features, that are illustrated with a variety of 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 through a PCB producer or produce your individual boards.
Making PLCs extra simply available, this particular publication is written for complex scholars, training engineers, and hobbyists who are looking to find out 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 setting.

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1 (a) The macro ld and (b) its flowchart. 3. 2 shows the macro ld_not 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. In ladder logic, this macro is represented by a normally closed (NC) contact. When the input variable is 0 (respectively 1), the output (W) is forced to 1 (respectively to 0). 4. begin W 1 N ? 2 (a) The macro ld_not and (b) its flowchart. 5. 3 shows the macro not and its flowchart. This macro is used as a logical NOT gate.

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. Eight independent debouncers are chosen by this number. It is used to define the 8-bit variable “DBNCR1+num” and the edge detector bit “DBNCRRED1,num”.

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. 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.

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Building a Programmable Logic Controller with a PIC16F648A Microcontroller by Murat Uzam


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