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Plcs > Plcs > Flashcards

Plcs Flashcards

0
Q

On the Mitsubishi PLC the letter designations for inputs and outputs in a ladder dia. Are

A

X-inputs

Y-outputs

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1
Q

What are the four sections of a Plc?

A

CPUs,input,output, and power supply

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2
Q

Counters can be either 16 bit or 32 bit

A

True the address of the timer determines what it is, without a D modifier

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3
Q

All set bits must have the following

A

RST bits

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4
Q

Set bits and rst bits are what side of the ladder

A

Right side used as an output

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5
Q

What is the difference between PLS/PLF?

A

The output for PLS is on the rising edge and the PLF is in the falling edge

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6
Q

What modifier will increase to two registers

A

D

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7
Q

What modifier will pulse a output?

A

The letter P after the output instruction

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8
Q

What instruction set will copy data from one location to another location?

A

MOV

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9
Q

What is the primary purpose for data registers?

A

For the storage of data

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10
Q

Special Memory bits are allocated to what addressed range?

A

M8000-M8511

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11
Q

Special data registers are allocated to what address range?

A

D8000

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12
Q

Data registers can be used in the following?

A

Timer preset values
Counter preset values
Math answers

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13
Q

What is a data register?

A

16 bits matrix binary

Stores it as 0 or 1

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14
Q

Name the four numbering systems used in PLC and their radix?

A

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

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15
Q

What is 1001001101 =?

A

589

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16
Q

What is the value of the following BCD number 1001 0011

A

93

17
Q

What are the limitations to a 32 bit counter?

A

Can have negative preset values
Have to use a M8 xxx address to determine the direction of the counter
Bi- directional counting

18
Q

Limitations of a 16 bit counter?

A

Counts up from zero
Doesn’t count past the preset value
Can count to 32767

19
Q

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 )

A

M2 K100 < c20
M1 K100 = c20
M0 K100 > c20

20
Q

A comparison statement can be entered two different ways?

A

Output

Inline or input

21
Q

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?

A 
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
22
Q

In C0 k2 what does the k stand for?

A

K decimal

23
Q

Define the following numeric constants?
K
H
E

A

K decimal
H hexadecimal
E floating or real number

24
Q

In an octal numbering system, what two numbers are never used?

A

8 & 9

25
Q

Why are transistors used?

A

When very fast switching is required.

26
Q

What current does a transistor use?

A

DC

27
Q

What current does a triac use?

A

AC

28
Q

What current does a relay use?

A

Either ac or dc

29
Q

What voltage can we use in our PLCS?

A

AC or DC voltage

30
Q

Why are PLCS used over conventional motor controls?

A

Less space
Hardwiring time
More reliable
Easily changed

31
Q

What are the four units that make a Plc?

A

CPU
Input unit
Output unit
Power supply

32
Q

What numbering system does the Mitsubishi unit use?

A

Octal

33
Q

The terms sinking sourcing refers to what?

A

The direction the current is flowing.

A common terminal

34
Q

A sinking device is also known as?

A

NPN

35
Q

A sourcing device is also known as?

A

PNP

36
Q

USB stands firm?

A

Universal Serial Bus

37
Q

What is the scan cycle?

A

The amount of time required by the processor to process the ladder diagram one time.

38
Q

Inputs are protected by what type of device?

A

Photo couplers or optal coupler

39
Q

What must be took into consideration when adding new expansion modules in the Mitsubishi PLCS?

A

Make sure the power supply is not exceeded.

40
Q

Three connections used in the Mitsubishi PLCS are?

A

Serial
USB
Ethernet

41
Q

What is the difference between Call and Jump instructions?

A

Call has a sub routine and the main program will resume after the subroutine was called.
The jump condition jumps to the pointer location and skips everything in between.

Plcs (1 decks)

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