Automation Flashcards
Parts of plc
Rack
CPU
Input (programmable terminal )
Output
Power supply
What’s an interposing relay for
When’s Amps of load exceed the rating of output
What eliminates voltage spikes
MOV metal oxide varistor
When adding extra start/stop buttons how are they wired in?
Starts in parallel
Stops in series
All logic functions happen through ?
CPU
Another way to describe plc
Industrial computer
Another word for programming terminal
Loading terminal
TTL operates on how many volts ?
5 volts
What’s does discrete mean?
On or off … digital is discrete
Zero speed switch/holding contact is used for ?
Proving
2 wire system is auto or manual?
Manual
3 wire system is auto or manual?
Auto
Sync is ?
Holding contact so cct doesn’t run drift
Tracking is ?
Memory cct
Explain low voltage release
Automatically comes back on
Explain low voltage protection
Won’t come back on automatically needs an operator to press start
What type of isolation is used to electrically separate outside voltages from internal cct of plc
Optical
What part of the plc is the brains ?
CPU
If an output module controls dc voltage what solid state is used to connect the load to line?
Power phototransistor
If an output module controls controls ac voltage what solid state device is used to connect line to load?
Triad or phototriac
The power supply to operate loads such as starter coils ,indicating light or solenoid valves must be provided by ?
External source
HTL operates on how many volts ?
15
