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The Input Output System
The input output system provides the physical connection between the equipment and the PLC there are many different kinds of I/O cards which serve to condition the type of input or output so the CPU can use if for its logic. This simply a matter of determining what inputs and outputs are needed, filing the rack with the appropriate cards then addressing them correctly in the CPU program.
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Branch Operations Normally the program executes in a sequence. The contents of the program counter register are incremented by one during the execution of current instr
Third Generation ( 1964- 1982 ) Invention of technology of integrated circuits created computers of third generation. In several logical gates are fabricated on a singl
PUSH PSW Instruction It is similar to above push instruction but instead of normal register Paris it use PSW as its operand. Program status word comprises of the content
Transparent latch D flip Flop A typical example of this type of D flop is 7475 shown in figure when CLK connected is enable signal is high and the flip flop is enabled
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Q. (a) Determine the voltage at A in Figure . (b) With V i = 10 V, R 1 = 10 k, R 2 = 1000 , and A = 100, find the current i .
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A method used in advanced microprocessors where the microprocessor begins implementing a second instruction before the first has been done. That is, various instructions are in the
Consider the 220-V, 1800-r/min dc motor, controlled by a three-phase fully controlled rectifier from a 60-Hz ac source. The armature-circuit resistance and inductance are 1.5 and
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