Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 17)

Fundamentals of a
Programmable Controller
Chapter 2
2-3
Power Supply
Processor
Information
Limit, Proximity, Pressure,
Action
(Decision Making)
•
Temperature Switches
Push Buttons
Logic
BCD
Analog
•
•
•
•
Solenoids •
Motor Starters
Indicators
Alarms
Logic
BCD
Analog
•
•
•
•
•
•
Input Output
Processor
The first section of a programmable controller is the processor. The
processor might be called the “brains” of the programmable controller. It
is divided into halves:
central processing unit
memory
CPU
Data
Table
Program
Storage
Message
Storage
Memory
Processor
Section
Central Processing Unit
The Central Processor Unit (CPU) makes decisions about what the
processor does according to the program you write.