By Murat Uzam
Programmable good judgment controllers (PLCs) are widely 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 unusually, the layout and implementation of those PLCs have lengthy been a mystery of brands. Unveiling the mysteries of PLC expertise, Building a Programmable common sense 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 chain of articles released in Electronics World 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 a number of macros
- Flowcharts that can assist you comprehend the macros (functions)
In this e-book, the writer offers distinct reasons of and software program buildings. He additionally describes PIC meeting macros for all uncomplicated PLC services, that are illustrated with quite a few examples and flowcharts. An accompanying CD includes resource records (.ASM) and item records (.HEX) for the entire examples within the publication. It additionally provides published circuit board (PCB) (Gerber and .pdf) records that you can have the CPU board and I/O extension forums produced through a PCB producer or produce your personal boards.
Making PLCs extra simply available, this certain publication is written for complex scholars, training engineers, and hobbyists who are looking to how one can 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 environment.
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Extra resources for Building a Programmable Logic Controller with a PIC16F648A Microcontroller
Begin W 0 N ? 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.
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 “DBNCR0+num” and the edge detector bit “DBNCRRED0,num”. 7. 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.
18 The macro send_outputs. 4,Q0. Then, the macro HC595 will take four 8-bit output data stored in Q3, Q2, Q1, and Q0 and send them serially to the four TPIC6B595 register ICs, respectively. In the second task within this macro, the watchdog timer is cleared. In the third task, the FRSTSCN special memory bit is reset. , when it is 1 it is reset, and when it is 0 it is set. 4 Example Program Up to now we have seen the hardware and basic software necessary for the PIC16F648A-based PLC. It is now time to consider a simple example.