Chapter 3 Flashcards
1
Q
Processor is referred to ______ of PLC
A
Brain
2
Q
Volatile Memory
A
Loses its stored information when power is removed.
3
Q
Non-Volatile Memory
A
Ability to retain stored information when power is removed
4
Q
1K of memory =
A
1024 words
5
Q
When a PLC is turned ON it runs a self-diagnostic or self check test
A
True
6
Q
Four steps of a typical PLC processor scan
A
- Determine status of input devices
- Interpret logic of program (Read and Ladder Logic)
- Update (Turn ON or OFF output devices)
- Communication and Housekeeping
7
Q
Actual scan time increase with _______ of words
A
Increase
8
Q
User Memory
A
Stores program
9
Q
Storage Memory
A
Stores Data
10
Q
Memory size ranges from _____ to _____
A
256 words 32 meg (million)
