Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
Chapter 11, Problem 11P
Program Plan Intro
Count-Up (CTU) Counter:
- The CTU counter refers to an up counter
- This counter is used to count an event that occurs logically or externally and places that value in the counter’s accumulator.
- The accumulated value can even be maintained during false rung conditions and can be reset back to 0 using reset instruction.
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.
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A PLC is used to control a single-axis robot, in which the axis is driven by a pneumatic cylinder.
An output signal to the pneumatic cylinder causes it to extend (ON state). When there is no
signal, the pneumatic cylinder retracts (OFF state). The gripper is an also driven by a pneumatic
cylinder. The gripper open position is an OFF state and the closed position is an ON state. In
order to perform a task, the following sequence of operations must be performed:
TH
Sequence No.
Аxis
Gripper
OFF
OFF
1
ON
OFF
ON
ON
3
OFF
ON
4
OFF
OFF
The process begins when the start bush button is ON and a part triggers a limit switch. For
safety, an emergency switch is used to shut off the entire system. Design a PLC ladder diagram
for this application.
1- Write a PLC ladder program to implement the process illustrated in Figure.
2- Indicate all the input and output field devices in their un-actuated conditions with symbolic addresses.
The sequence of operation requires that:
Normally open start push button and normally closed stop push button station is used to start and stop the
process.
When the process starts, the tank is empty and solenoid A energizes to start filling the tank with liquid.
As the tank fills, the Empty sensor switch closes.
When the tank is half full, the Mid-full level sensor switch closes and the motor starts running to mix the
liquid.
When the tank is full, the Full level sensor switch closes momentarily so that:
a- The motor stops.
b- Solenoid A is de-energized.
c- Solenoid B is energized to empty the tank.
When the tank is completely empty, the Empty sensor switch opens to de-energize solenoid B.
The start button is pressed to repeat the sequence.
SOL A
Motor
Full level
sensor
switch
Mid-Full
level
sensor…
1- Write a PLC ladder program to implement the process illustrated in Figure.
2- Indicate all the input and output field devices in their un-actuated conditions with symbolic addresses.
The sequence of operation requires that:
Normally open start push button and normally closed stop push button station is used to start and stop the
process.
When the process starts, the tank is empty and solenoid A energizes to start filling the tank with liquid.
As the tank fills, the Empty sensor switch closes.
When the tank is half full, the Mid-full level sensor switch closes and the motor starts running to mix the
liquid.
When the tank is full, the Full level sensor switch closes momentarily so that:
a- The motor stops.
b- Solenoid A is de-energized.
c- Solenoid B is energized to empty the tank.
When the tank is completely empty, the Empty sensor switch opens to de-energize solenoid B.
The start button is pressed to repeat the sequence.
SOL A
Motor
Full level
sensor
switch
Mid-Full
level
sensor…
Chapter 11 Solutions
Programmable Logic Controllers
Ch. 11 - Explain the function of math instructions as...Ch. 11 - Prob. 2RQCh. 11 - What standard format is used for PLC math...Ch. 11 - Prob. 4RQCh. 11 - Prob. 5RQCh. 11 - Prob. 6RQCh. 11 - Prob. 7RQCh. 11 - Prob. 8RQCh. 11 - Prob. 9RQCh. 11 - Prob. 10RQ
Ch. 11 - With reference to the instruction of Figure 11-34,...Ch. 11 - With reference to the instruction of Figure 11-35,...Ch. 11 - Prob. 1PCh. 11 - Prob. 4PCh. 11 - Prob. 5PCh. 11 - Prob. 7PCh. 11 - Prob. 8PCh. 11 - With reference to math instruction program shown...Ch. 11 - With reference to the math instruction program...Ch. 11 - Prob. 11PCh. 11 - Prob. 12P
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