Chapter 9 and 10

Question 1

Addressing Mode

Answer 1

Means by which the PLC selects the data thai is use in an instruction

also

describes the relationship between the operand and the data, that is how we use the operand to get the correct data

Question 2

Data

Answer 2

Numberical values that are used in computations

• for example if the PLC has the value 3 in a memory location and the value 4 in another location, and there is an instruction to add the values in these two locations, the there are two data values

Question 3

Operands

Answer 3

Symobles in an Instruction

• Again, if the instruction were to add the two memory location, then the data would be the same, but the operand would be the symbols for the locations

Question 4

Direct Addressing

Answer 4

the memory address of the data is supplied with the instruction

Question 5

Indirect addressing

Answer 5

the address in the instruction serves as reference point and does not point directly to the data location

Question 6

Indexed Addressing

Answer 6

addresssing mode for referecing a memory location that is the original memory address plus the value stored in an index register

Question 7

Indexed Indirect Addressing

Pre-indexed addressing

Answer 7

which is a combination addressing method that incorates indexed addressing prior to the use of indirect addressing

Question 8

Indexed Indirect Addressing

Post-indexed addressing

Answer 8

which is a combination addressing method that incorporates indexed addressing after the use of indirect addressing

Question 9

Indirect addresses use________, to hold an address where the data is laocted

Answer 9

[]

Question 10

Array

Answer 10

data structure that allocates a contiguous block of memory to store a specific data type as a table of values

Question 11

Contiguous Block

Answer 11

means memory locations that are adjacent to each other

Question 12

Data handling

Answer 12

includes the movement and manipulation of data by arithmetic and logical operation. The data handling is accomplished on bits, words, and files, where worlds are also referred to as registers and files as tables, blocks, or arrays

Question 13

Bit pattern in one word

Answer 13

or register can be transferred to another work or register.

Question 14

Pattern of words

Answer 14

that comprises a file has distinct starting and ending locations.

Question 15

file-to-file transfer

Answer 15

• is used when the words in one file represent a set of data that is used many times within a process, but must remain unchanged after each operation in the process.

Question 16

word to file and file to word

Answer 16

are used in processes driven by a PLC Figure below illustrates these there type of transfers. The file-arithmetic –logic (FAL) instruction is used to accomplish these transfers.

Question 17

Answer 17

File to word Tansfer

Question 18

Answer 18

Word to file transfer

Question 19

Answer 19

File to file transfer

Question 20

Bitwise and (AND)

Answer 20

performs a bit by bit logical AND operation.

Question 21

Bitwise or (OR)

Answer 21

performs a bit by bit logical OR operation

Question 22

Bitwise exclusive or (XOR)

Answer 22

performs a bit by bit logical EXCLUSIVE OR operation

Question 23

File arithmetic logic (FAL)

Answer 23

• performs copy, arithmetic, logic, and function operation on the data stored in files or arrays
  
  • FAL instruction is used to transfer data from one file to another and perform arithmetic and logic operations on files

Question 24

Bit shift left (BSL) and Bit shift right (BSR)

Answer 24

shifts the bits within a word or specified bits in an array one position to the left of right respectively

Question 25

FIFO load (FFL) and FIFO (FFU)

Answer 25

loads data into a file and unloads data from a file, respectively. When used in pairs, they perform the FIFO function first in, first out

Question 26

LIFO load (LFL and LIFO unload (LFU)

Answer 26

loads data into a file and unloads data from a file, respectively. When used in pairs, they perform the LIFO function last in, first out.

Question 27

Copy (COP)

Answer 27

copies data files form one register location to another, maintaining the sequential sequence of the data.

Question 28

Fill (FLL)

Answer 28

• copies the contents of one register location to a specified number of other register locations

Question 29

Shirt Registers

Answer 29

• is a logical operator that permits a register to move its contents to the right or to the left9