Chapter 2 Flashcards
1
Q
Purpose of the I/O Section
A
Ability to change virtually any type of voltage or current signal into a logic-level signal that is compatible with the processor
2
Q
Two reasons for emplying optical isolation
A
Protects processor from input line voltage and electrical noise
3
Q
Why is a hard-wired emergency stop circuit recommended for PLC installations
A
Protect personnel, equipment, and product
4
Q
I/O modules are not keyed to prevent unauthorized personnel from removing them from the I/O rack
A
True
5
Q
E-stop refers to
A
Emergency Stop
6
Q
Environmental considerations when installing PLC equipment
A
Dust
Heat
Humidity
Vibration
7
Q
PLCs that take logner than ______ to scan are considered slow
A
50+ milliseconds
