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Source publication
The comparison macros in a PLC with PIC16F648A microcontroller is described for comparing the content of an 8-bit register with an 8-bit constant. The need for 8-bit variables is satisfied by a macro, which is described to load an 8-bit number into an 8-bit variable. These macros depend on a Boolean input variable taken into the macro and Boolean o...
Contexts in source publication
Context 1
... first example program, "UZAM_plc_8i8o_ex13.asm" is shown in Figure 2. It shows the usage of all six comparison macros for comparing the contents of two registers as described in Table 2. ...
Context 2
... first example program, "UZAM_plc_8i8o_ex13.asm" is shown in Figure 2. It shows the usage of all six comparison macros for comparing the contents of two registers as described in Table 2. The schematic and ladder diagrams of the user program of "UZAM_plc_8i8o_ex13.asm" shown in Figure 2 are depicted in Figure 3a and 3b. ...
Citations
Programmable logic controllers (PLCs) have been used extensively in industry
for the past five decades. PLC manufacturers offer different PLCs in terms
of functions, program memories, and the number of inputs/outputs (I/Os),
ranging from a few to thousands of I/Os. The design and implementation of
PLCs have long been a secret of the PLC manufacturers. Recently, a serious
work was reported by the author of this book to describe a microcontrollerbased
implementation of a PLC. With a series of 22 articles published in
Electronics World magazine (http//www.electronicsworld.co.uk/) between
the years 2008 and 2010, the design and implementation of a PIC16F648Abased
PLC were described. This book is based on an improved version of the
project reported in Electronics World magazine.
This book is written for advanced students, practicing engineers, and hobbyists
who want to learn how to design and use a microcontroller-based
PLC. The book assumes the reader has taken courses in digital logic design,
microcontrollers, and PLCs. In addition, the reader is expected to be familiar
with the PIC16F series of microcontrollers and to have been exposed to writing
programs using PIC assembly language within an MPLAB integrated
development environment.
The CD-ROM that accompanies this book contains all the program source
files and hex files for the examples described in the book. In addition, PCB
files of the CPU and I/O extension boards of the PIC16F648A-based PLC are
also included on the CD-ROM.
