PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Chapter 10, Problem 13RQ
Program Plan Intro

Data comparison instructions:

  • Data comparison instructions refer to input instructions.
  • It is used to compare two numerical data values and take decisions based on the program instructions.
  • It can also be used to check the numerical value pairs for determining if a rung is true.
  • The basic set of data comparison functions performed by PLCs are as follows:
    • Equal to (=)
    • Not equal to (!=)
    • Less than (<)
    • Greater than (>)
    • Less than or equal to(<=)
    • Greater than or equal to (>=)
  • The above given compare instructions are used to compare the values of source A and source B.

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.

Explanation of Solution

b.

LESS THAN instruction:

  • The LESS THAN (LES) instruction is used to test whether the given value is less than the other value or not.
  • If the given value such as Source A is less than Source B, then the instruction is logically true. Otherwise, the given instruction is logically false.

Explanation:

In the given logic rung,

  • The output D is energized whenever input C is true...

Explanation of Solution

c.

GREATER THAN OR EQUAL instruction:

  • The GREATER THAN OR EQUAL (GEQ) instruction is used to test whether the given value is greater than or equal to the other value or not.
  • If the given value such as Source A is greater than or equal to Source B, then the instruction is logically true. Otherwise, the given instruction is logically false.

Explanation:

In the given logic rung,

  • The output F is energized whenever input E is true...

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