I4 PLC Flashcards
1
Q
What is a PLC most commonly used for?
A
To control a machine or automated process
2
Q
What essential elements do programmable controllers consist of?
A
Input section
CPU section
Output section
Programming device
3
Q
What is the input section designed to do?
A
Sense the state of the field devices that are wired to the input terminals.
4
Q
Input section devices mainly fall into what 3 categories?
A
Discrete input: contacts and electronic switches
Analog input: thermistors and potentiometer
Pulse generating devices: shaft encoder
5
Q
What components does the CPU include?
A
Power supplies
Memory
Microprocessor
