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Chapter 1

PLC

The number and type of I/Os cannot be changed in a fixed PLC True
A personal computer communicates with the PLC processor via a communications link. True
The programming device must be connected to the controller to run the program. False
PLC systems usually require as much space in an enclosure as equivalent hardwired relay systems. false
A PLC is basically a computer designed for use in electrical control applications true
One disadvantage of modular I/O is its lack of flexibility. false
A PLC power supply module does not normally supply power to the field devices in a modular PLC. true
Removing the programming device from the PLC will not affect the operation of the user program. true
Software installed and run on a personal computer can be used to write a PLC program. true
PLCs were originally designed as replacements for: relay control panels
Basically, the function of a PLC is to:
Modifying relay-type process control circuits usually involves changing the:
The main difference between a PLC and relay control system is that:
The central processing unit:
The output interface module connects to:
The programming device:
At the start of the PLC scan the:
The scan time is the time required:
Unlike personal computers, PLCs are:
Which module of the PLC is responsible for performing logical operations?
Created by: dwal86
 

 



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