Chapter 10, Problem 9RQ

Program Plan Intro

Data manipulation instructions:

• Data manipulation instructions enable the numerical data that exists in the controller’s memory to be performed within the control program.
• Data manipulation instructions allows manipulation of data that is stored in either single or multiple words groups.
• It also includes the transfer of data from one data memory area of the Programmable Logic Controller (PLC) to another.
• In order to accomplish data manipulation, there are mainly two different kinds of instructions.
  • Instructions which operate on word data.
  • Instructions which operate on file or block.
• It also provides great flexibility to program control circuits.

File:

• A file refers to a group of words contained in the data table.
• It must have a definite start and end positions.
• It is used for storing information.

File Arithmetic and Logic (FAL) instruction:

• The FAL instruction is used to copy the contents of one file from location to another.
• It performs file arithmetic and logic operations on the contents of each file.
• There are mainly six parameters and addresses which must be entered into the FAL instruction. They are as follows:
  • Control
  • Length
  • Position
  • Mode
  • Destination
  • Expression