Plcs Flashcards
On the Mitsubishi PLC the letter designations for inputs and outputs in a ladder dia. Are
X-inputs
Y-outputs
What are the four sections of a Plc?
CPUs,input,output, and power supply
Counters can be either 16 bit or 32 bit
True the address of the timer determines what it is, without a D modifier
All set bits must have the following
RST bits
Set bits and rst bits are what side of the ladder
Right side used as an output
What is the difference between PLS/PLF?
The output for PLS is on the rising edge and the PLF is in the falling edge
What modifier will increase to two registers
D
What modifier will pulse a output?
The letter P after the output instruction
What instruction set will copy data from one location to another location?
MOV
What is the primary purpose for data registers?
For the storage of data
Special Memory bits are allocated to what addressed range?
M8000-M8511
Special data registers are allocated to what address range?
D8000
Data registers can be used in the following?
Timer preset values
Counter preset values
Math answers
What is a data register?
16 bits matrix binary
Stores it as 0 or 1
Name the four numbering systems used in PLC and their radix?
Decimal base 10 0,1,2,3,4,5,6,7,8,9
Binary base 2 0,1
Octal base 8 0,1,2,3,4,5,6,7
Hexadecimal base 16 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f
What is 1001001101 =?
589
What is the value of the following BCD number 1001 0011
93
What are the limitations to a 32 bit counter?
Can have negative preset values
Have to use a M8 xxx address to determine the direction of the counter
Bi- directional counting
Limitations of a 16 bit counter?
Counts up from zero
Doesn’t count past the preset value
Can count to 32767
In a comparative instruction that is placed at the output instruction the three consecutive M bits will correspond with to what instruction?
Xo———-( cmp k100 c20 m0 )
M2 K100 < c20
M1 K100 = c20
M0 K100 > c20
A comparison statement can be entered two different ways?
Output
Inline or input
List and explain the four 16 bit math functions used in PLCS including the instruction?
To make these instructions 32 bit?
To make theses functions work you must have?
Addition ADD Subtraction SUB Multiplication MUL Division DIV Add a D in front A source A and source B and a destination to put them
In C0 k2 what does the k stand for?
K decimal
Define the following numeric constants?
K
H
E
K decimal
H hexadecimal
E floating or real number
