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Four main components of a PLC

Programming Device
Processor Unit
Power Supply
I/O Interface

1

Interface

Two systems come together and interact, or communicate

2

Discrete

I/O devices that are either ON or OFF, open or close

3

Real World

Actual devices that exist and must be physically wired.
I/O outside the PLC

4

Analog

Devices that have a range of possible values

5

LED
CPU
PLC
ADC

Light Emitting Diode
Central Processing Unit
Programmable Logic Controller
Analog-to-Discrete Converter

6

DAC
NEMA
LCD
PC

Discrete-to-Analog Converter
National Electrical Manufacturing Association
Liquid Crystal Display
Personal Computer

7

Two types of programming styles

Hand-held
PC

8

Relay Ladder Logic is a high-level graphic computer language

True

10

Major advantage of PLC over traditional hard wired system

Faster
Reliable
Regular relay system
Flexible
Can be reprogrammed

11

Input devices can be run on

120V AC
24V AC
24V DC