Basics of PLC

CHAPTER 1 PROGRAMMABLE LOGIC CONTROLLERS (PLC’s)

AN OVERVIEW

1-3 Given four NO pushbuttons (A-B-C-D), write a program that will turn a lamp on if pushbuttons A and B or C and D are closed. Use the I/0 simulator screen and the following addresses to simulate the program:

INPUTS OUTPUT Pushbutton A - I: 1/0 L1 - O: 1/0

Pushbutton B - I: 1/01

Pushbutton C - I :1/06

Pushbutton D - I :1/07

1 -4 Write a program for the relay schematic shown.

Use the 1/0 simulator screen and the following addresses to simulate the program.

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INPUTS OUTPUT

S1 - I: 1/0 L1 -O: 1/0

LS1 - I: 1/1

LS2 - I: 1/6

CHAPTER 2 PLC HARDWARE COMPONENTS

2-1 Write a program that will simulate the input module, output module, and data table conditions for the PLC diagram shown.

Use the I/O simulator screen and the following addresses to simulate the program:

INPUTS OUTPUTS

NC Pushbutton - I: 1/4 L1 - O: 1/2

NO Pushbutton - I: 1/7 L2 - O: 1/7



CHAPTER 3 NUMBER SYSTEMS AND CODES

3-1 Write a program that will result in the binary number 101 being stored at output word one. Use the I/O simulator screen and the following addresses to simulate the program:

INPUTS OUTPUTS

I: 1/0 O: 1/0

I: 1/1 O: 1/1

I: 1/2 O: 1/2

CHAPTER 4 FUNDAMENTALS OF LOGIC

4-4 Write a program for the relay schematic shown. Use the I/O simulator screen and the following addresses to simulate the program:

INPUTS OUTPUT

LS1 - I: 1/0 SOL - O: 1/0

LS2 - I: 1/1



CHAPTER 5 BASICS OF PLC PROGRAMMING

5-3 Write a program that will implement the ladder logic program shown.


INPUTS OUTPUT

A - I: -1/0 Y - O: 1/0

B - I: -1/1

C - I: -1/6

D - I: -1/7

E - I: 1/2



CHAPTER 6 DEVELOPING FUNDAMENTAL PLC WIRING DIAGRAMS

AND LADDER LOGIC PROGRAMS

6-1 Write a program that will implement the hardwired motor control relay schematic shown. Use the I/O simulator screen and the following addresses to simulate the program:

INPUTS OUTPUTS

Stop - I: 1/4 F - O: 1/0

Start - I: 1/2 R - O: 1/1

Selector Switch - I: -1/0 (closed for forward)

OLs I:1/5

CHAPTER 7 PROGRAMMING TIMERS

7-1 Write a program that will simulate the on-delay timer circuit schematic shown. Use the I/O simulator screen and the following addresses to simulate the program:

INPUT OUTPUT TIMER

S1 - I: 1/0 L1 - O: 1/0 TON – T1



CHAPTER 8 PROGRAMMING COUNTERS

8-2 Write a program that will implement the following conveyor motor control process:

OPERATIONAL SEQUENCE - The start button is pressed to start the conveyor motor.

- Cases move past the proximity switch and increment the counter's accumulated value.

- After a count of 13, the conveyor motor stops automatically and the counter’s accumulated value is reset to 0.

- The conveyor motor can be stopped and started manually at any time without loss of the accumulated count.

- The accumulated count of the counter can be reset manually at any time by means of the count reset button.

- The process is repeated when the start button is pressed.

Use the Silo simulator screen and the following addresses to



simulate the program:

INPUTS OUTPUT COUNTER

Start button - I: 1/1 Conveyor Motor - O: 1/0 CTU - C1

Stop button - I: 1/0

Count reset button - I: 1/2

Proximity Switch (NO) - I: 1/3



8-23 Write a program to implement the process illustrated. An up- counter must be programmed as part of a batch-counting operation to sort parts automatically for quality control. The counter is installed to divert 1 part out of every 10 for quality control or inspection process. The circuit operates as follows.

- A start/stop pushbutton station is used to turn the conveyor motor on and off.

- A proximity sensor counts the parts as they pass by on the conveyor.

- When 10 is reached, the counter's output activates the gate solenoid, diverting the part to the inspection line.

- The gate solenoid is energized for 2 s, which allows enough time for the part to continue to the quality control line.

- The gate returns to its normal position when the 2 s time period ends.

- The counter resets to zero and continues to accumulate counts.

- A reset pushbutton is provided to reset the counter manually.

Use the Silo simulator screen and the following address to simulate the program:

INPUTS OUTPUTS

Conveyor stop PB - I: 1/0 Conveyor motor - O: 1/0

Conveyor start PB - I: 1/1 Solenoid - O: 1/0

COUNTER TIMER



CTU - C1 TON - T1

CHAPTER 9 PROGRAM CONTROL INSTRUCTIONS

9-1 A temporary jumper can be installed in a PLC program in order to force a control ON or OFF as illustrated below. A dedicated I/O address can be used to operate all jumpers. Jumpers that are identified in this way are easy to locate in the program. Simply look for that particular I/O address and you will find every jumper that is used in the program.

9-1(a) Construct a PSIM program for the generic ladder logic program shown.



Use the I/O simulator screen and the following address to simulate the Program:

INPUTS OUTPUTS

S1 - I: 1/0 PL1 - O: 1/1

S2 - I: 1/1 PL2 - O: 1/2

S3 - I: 1/6 PL3 - O: 1/4

PL4- O: 1/4



CHAPTER 10 DATA MANIPULATION INSTRUCTIONS

10-6 Write a PSIM program that will implement the generic adjustable on-delay PLC timer program shown using data compare instructions.


INPUT OUTPUT TIMER

PB1 - I: 1/2 PL1 - O: 1/0 TON - T1

SS1 - I: 1/0

INTERNAL RELAYS

O: 2/0 & O: 2/1



End of Sample Exercise Manual



Basics of PLC

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