1. The document contains questions and answers about programmable logic controllers (PLCs) and digital controllers. 2. It compares key differences between PLCs and computers, such as PLCs being designed for logic control in industrial environments while computers are optimized for calculation and display tasks. 3. The document also discusses PLC programming languages like ladder logic and statement lists, as well as components, communication types, and advantages of PLCs.

1. 1
Al- Hadba University College
Department of Technical
Computer Engineering
‫الجامعة‬ ‫الحدباء‬ ‫كلية‬
‫الحاسوب‬ ‫تقنيات‬ ‫هندسة‬ ‫قسم‬
Digital Controllers
Lecture No.10
Tutorial
Assist. Lect. Hiba Abdul –Kareem

2. Q1) What differentiates a PLC from a computer?
1) A computer is optimized for calculation and display tasks
2) A computer is programmed by specialists
3) A PLC is designed for (logic) control
4) A PLC is programmed by non-specialists
5) A PLC is well adapted to industrial environment
Q2) What is ladder diagram language?
ladder diagram: a graphical language resembling the electrical relay
diagrams
Q3) What is statement list in PLC programming language?
statement list: a set of mnemonic instructions representing a function
of the CPU

3. Q4)What is the Ladder equivalent diagram of electrical circuit ?
ANSWER:

4. Q5)What is the Ladder equivalent diagram of electrical circuit ?
ANSWER:

5. Q6)What is the Ladder equivalent diagram of electrical circuit ?
ANSWER:

6. Q7)What is the Ladder equivalent diagram of electrical circuit ?
ANSWER:

7. Q8)What are the advantages of Serial communication?
1. Used for long distance communication
2. Low Cost
Q9)What is the advantage of Serial communication?
The speed of serial Communication is very slow than parallel
communication
Q10)What is the advantage of Parallel communication?
1. Used for short distance communication
2. Data transfer speed is high.
Q11)What is the disadvantage of Parallel communication?
It is not preferred for long distance communication as it requires
more number of wires and becomes expensive.

8. Q12)What are the types of communication systems?
1. Simplex – Data can be transmitted only in one direction at a time.
2. Half Duplex – Data can be transmitted only in one direction at a time.
3. Full duplex – Data can be transmitted in both directions at a time.
Q13)What are the PLC operation sequence?
1. Self test
2. Input scan
3. Logic solve/scan
4. Output scan:
Q14)What are the PLC Advantages?
1. Flexibility in programming and reprogramming.
2. Cost effective for controlling complex systems.
3. Small physical size.
4. High speed of operation.
5. Ease of maintenance /troubleshooting

9. Q15) Fill in the blank
1) Bit time is the time taken to transmit a bit/sec
2) Bit rate is the number of bits transmitted per second
3) Baud rate is the number of symbols generated in a second
4) the types of communication systems are Simplex , Half Duplex
and Full duplex
5) ladder diagram is a graphical language resembling the
electrical relay diagrams
6) statement list is a set of mnemonic instructions representing a
function of the CPU
7) Asynchronous transmission Is a transmission of data without
use of an external clock signal
8) synchronous transmission Is a transmission of data with
use of an external clock signal
9) The speed of serial Communication is very slow than parallel
communication

10. 10) In Parallel communication All bits of data are sent at a time.
11) In Serial communication Only one bit is sent at a time.
12) PLC is a computer designed to work in an industrial environment
13) PLC is an industrial computer designed for multiple inputs and output
arrangements.
Q16)What are the major component of PLC?
1)Power supply
2)CPU
3)Input module
4)Output module
5)Programming device
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‫او‬ ‫اختيارات‬ ‫بشكل‬
‫وخطأ‬ ‫صح‬