PLC

Question 1

digitally operating electronic apparatus which uses a programmable memory for the internal storage of instructions by implementing specific functions, such as logic, sequencing, timing, counting, and arithmetic to control through digital or analog I/O modules various types of machines or processes.“

Answer 1

Programmable Logic Controller (PLC)

Question 2

also known as the conventional relay logic replacer

Answer 2

PLC

Question 3

an electronic apparatus capable of storing logic and arithmetic operation used to control machines and processes.

Answer 3

Programmable Logic Controller

Question 4

PLC LEADING BRANDS

Answer 4

American: Allen Bradlley
European: Siemens
Asia: Omron and Mitsubishi

Question 5

is built by several modules within a single case. Therefore I/O capabilities are decided by the manufacturer, but not by user.

Answer 5

Compact PLC

Question 6

In compact type of PLC the maximum expansion possible is _
expansion.

Answer 6

3

Question 7

A compact type of PLC must be:

Answer 7

• Suitable for stand alone
• Fix number I/O’s module
  -Designed for simple application

Question 8

is built by several components that are plugged into a common rack or bus with extendable
I/O capabilities.

Answer 8

Modular PLC

Question 9

It is a type of PLC used for more complex and sophisticated control
- Flexible and versatile
- Huge I/O capabilities
- Suitable for centralized control systems

Answer 9

Modular PLC

Question 10

From Sensors:

Answer 10

Push buttons, contacts, input switches, etc.

Question 11

Major Components of PLC

Answer 11

From input > Processor +power supply +programming device > output module

Question 12

Output module

Answer 12

Solenoids, Contacts, Alarms, etc.

Question 13

Consist of Input modules and Output Modules

Answer 13

Input / Output (I/O) Section

Question 14

The most common type of I/O Interface module is

Answer 14

Discrete I/O Module

Question 15

It makes decisions and executes control
instructions based on the input signal

Answer 15

Processor (CPU)

Question 16

Its function is to store and run the PLC software
programs

Answer 16

Processor (CPU)

Question 17

It monitors the inputs and makes decisions in a PLC

Answer 17

Processor (CPU)

Question 18

It is the brain of the PLC

Answer 18

Processor (CPU)

Question 19

system that converts AC from the wall outlet
into the DC required by electronics circuit.

Answer 19

Power Supply

Question 20

Supplies DC power to other modules that plug into
the rack

Answer 20

Power Supply

Question 21

In large PLC system this power supply does not
normally supply power to the field devices

In small and micro PLC systems the power supply
is also used to power field devices.

Answer 21

Power Supply

Question 22

Programming Device

Answer 22

Personal Computer is the most commonly used programming device

Question 23

allows user to create, edit , document, store, and troubleshoot programs

Answer 23

software

Question 24

communicates with PLC via serial or parallel data communications link

Answer 24

Personal Computer

Question 25

PLC PROGRAMMING LANGUAGE

Answer 25

-Ladder logic (most common type of programming) -Instruction list (IL) - Sequential Function Chart (SFC) -Structured Text (ST) or -Function Block Diagram (FBD) Siemens version: -Structured Control -Language (SCL) = (ST) -Statement List (STL) = (IL)

Question 26

the most popular language today, especially in the US. It is based on the graphical representation of Relay Ladder Logic. Most current PLCs, whether compliant or not compliant with IEC61131-3, will support this

Answer 26

LADDER LOGIC

Question 27

This is like a version of ladder language but in text form. It has the same structure as assembly language.

Answer 27

Instruction List ( Siemens is called STL Statement List )

Question 28

This language is less used in practice than LAD

Answer 28

Instruction List ( Siemens is called STL )

Question 29

Provide another view of a set of instructions. Each function has a name to designate its specific task. Functions are indicated by a rectangle. Inputs are shown on the left- hand side(EN or enable in) and outputs are shown on the right-hand side(ENO or enable out).

Answer 29

Function Block Diagram 

Question 30

This is a very powerful high-level language for PLC, derived from the Pascal / C language. This is a language that is being increasingly used by engineers because it saves time It can be used to define complex function blocks, which can be used in other languages. As a high-level language, _____ is very intuitive and easy to understand.

Answer 30

Structured Text (Structured Control Logic for Siemens)

Question 31

This is a powerful graphical programming style to describe the sequential states of a control program. However, it is a bit difficult to learn and time consuming to program, so it is the least used language of the 5 languages ​​according to IEC61131-3. It is mainly used in programming control problems in sequential cycles

Answer 31

Sequential Function Chart (CFC for Siemens)