Chapter 11, Problem 7P

Program Plan Intro

Math instruction:

• Math instructions refer to all output instructions that uses the data of two words or registers and perform the desired function.
• Math instructions are programmed based on the type of processor used.
• The data manipulation instructions are almost similar to math instructions.
• Math instructions are normally used to perform arithmetic functions on the values stored in memory words or registers.

Math functions:

The basic math functions performed by PLCs are as follows:

• Addition
  • This function is used to add one piece of data to another.
  • It is also called as ADD.
• Subtraction
  • This function is used to subtract one piece of data from another.
  • It is also called as SUB.
• Multiplication
  • This function is used to multiply one piece of data by another.
  • It is also called as MUL.
• Division
  • This function is used to divide one piece of data from another.
  • It is also called as DIV.

MOV instruction:

• Move (MOV) instruction is used to copy the data of the source register into destination register.
• Here, the contents of the source register will not be altered.
• In other words, it is used to copy the value in one word or register to another word or register.

Terms used:

The following terms are used in the instruction.

• Source A
  • Source A refers to the address of the first piece of data that is used in the instruction.
• Source B:
  • Source B refers to the address of the second piece of data that is used in the instruction.
• Destination
  • Destination refers to the address where the results of the instruction are stored.