Programmable Logic Controllers - CEU
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1
PLCs come in two basic forms: Brick I/O and Modular I/O.
True
False
2
The pictured symbol is commonly used in ladder logic. What does the symbol represent?
Normally Open
Normally Closed
Coil
3
The primary reason for designing PLC’s was eliminating the large cost of replacing complicated relay-based machine control systems.
True
False
4
A PLC works by __________.
Counting pulses
Consisting of individual rungs, each of which must contain one or more inputs and one or more outputs
Continually scanning a program
Translating all of the times being used into symbols
5
In a remote or distributed I/O networks, the PLC acts as the ____________ to the remotely-located I/O, via a communication adapter module.
Slave
Master
Counter
Timer
6
PLCs can be programmed in a variety or combination of programming languages in accordance with the ____________ standard.
IEC 61131-3
CoDesSys
ANSI
UL 489
7
This PLC component is connected to the outside world; send signals to solenoids, lights, etc.
Input Relay
Output Relay
8
Relay ladder logic utilizes basic relay wiring symbols to create the logic to control a machine or process.
True
False
9
An alarm horn is a(n )____________ device to the PLC.
Input
Output
Counter
Timer
10
PLC scan time is defined as the time it takes the PLCS to __________.
Check the input status
Execute the program
Update the output status
All of the above
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