By Murat Uzam
Programmable common sense controllers (PLCs) are greatly utilized in to accomplish automation projects, with brands delivering various PLCs that range in services, 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, development 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 sequence of articles released in Electronics international journal among 2008 and 2010. This e-book relies on a better 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 can assist you comprehend the macros (functions)
In this booklet, the writer offers particular motives of and software program constructions. 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 records (.ASM) and item documents (.HEX) for the entire examples within the e-book. It additionally provides published circuit board (PCB) (Gerber and .pdf) documents that you can have the CPU board and I/O extension forums produced by way of a PCB producer or produce your personal boards.
Making PLCs extra simply available, this special ebook is written for complex scholars, working towards engineers, and hobbyists who are looking to construct their very own microcontroller-based PLC. It assumes a few earlier 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 setting.
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Additional info for Building a Programmable Logic Controller with a PIC16F648A Microcontroller
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. Note that if the state change of the contact is shorter than the predefined debouncing time, this will also be regarded as bouncing, and it will not be taken into account. Therefore, no state change will be issued in this case.
Be enough SRAM locations reserved after var0, and also there should be enough TPIC6B595 registers to hold the outputs. There are some explanations within the macro to describe how it works. As can be seen, this macro makes use of previously defined data_out, clock_out, and latch_out bits to send the output signals serially to TPIC6B595 registers. 8, user interface button, limit switch, relay, or contactor contact, is opened or closed, the contact seldom demonstrates a clean transition from one state to another.
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. The input is taken from W, and the output is send out by W.