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Questions and Answers
What is the purpose of using compare instructions in PLC programming?
What is the purpose of using compare instructions in PLC programming?
Which instruction would you use in PLC programming to check if a value is less than another value?
Which instruction would you use in PLC programming to check if a value is less than another value?
What action should be taken if the sum of two counter values in a PLC program is exactly 10?
What action should be taken if the sum of two counter values in a PLC program is exactly 10?
Which step involves assigning input/output ports to devices in the PLC programming activity?
Which step involves assigning input/output ports to devices in the PLC programming activity?
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In the provided PLC programming task, what happens when the sum of two counter values is less than 10?
In the provided PLC programming task, what happens when the sum of two counter values is less than 10?
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What should be done after creating the PLC ladder logic diagram in the LogixPro simulation software?
What should be done after creating the PLC ladder logic diagram in the LogixPro simulation software?
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Study Notes
PLC Compare Instructions
- PLC compare instructions are used to compare values in a PLC program.
- There are five types of PLC compare instructions:
- A. Equal to (EQU): compares two values to determine if they are equal.
- B. Less than (LES): compares two values to determine if one is less than the other.
- C. Greater than (GRT): compares two values to determine if one is greater than the other.
- D. Less than or equal to (LEQ): compares two values to determine if one is less than or equal to the other.
- E. Greater than or equal to (GEQ): compares two values to determine if one is greater than or equal to the other.
Lab Activity 11-2: LogixPro Lab
- The objective of the lab is to practice using compare instructions and to create a PLC ladder logic diagram using LogixPro simulation software.
- The lab consists of two activities:
- Activity 1: Describing and practicing compare instructions.
- Activity 2: Using compare instructions to compare the sum of two values.
Activity 1 Procedure
- Step 1: Describe the PLC compare instructions and provide an example for each.
- Step 2: Assign PLC input/output ports to devices.
- Step 3: Create the PLC ladder logic diagram using LogixPro simulation software.
- Step 4: Place the software in run mode and download the PLC ladder logic diagram.
- Step 5: Demonstrate the working PLC system to the instructor.
Activity 2 Procedure
- Program the PLC station using two counters to count the pressing of two pushbuttons.
- Use the ADD instruction to add the counter values together.
- If the sum is greater than 10, turn the green pilot light (Green_PLT) on.
- If the sum is less than 10, turn the red pilot light (Red_PLT) on.
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Description
This quiz covers PLC compare instructions, specifically focusing on using compare instructions to compare the sum of two values. Topics include Equal to (EQU), Less than (LES), and Greater than (GRT) instructions. The quiz is designed for individuals learning about PLC programming.
