PLC Final Exam
The main difference between a PLC and a relay control system is that - Answer-One uses hardwired relay
control logic and the other uses programmed instructions
The symbol in a ladder logic diagram represents a: - Answer-Virtual relay coil
At the start of the PLC scan the: - Answer-Status of all inputs are read
Unlike personal computers, PLCs are - Answer-Equipped with input and output modules
Equipped with a control programming language
Designed for the industrial environment
A human machine interface (HMI) - Answer-Allows the user to monitor a process
allows the user to control a process
can provide a graphical representation of a process
Block No. 1 of the PLC block diagram represents the - Answer-programming device
Block No.4 represents the - Answer-input module
Block No. 5 represents the - Answer-output module
, Which module of the PLC connects directly to field devices such as pilot lights, motor starters, and
solenoids? - Answer-output
A __ is an example of a device that could be used to provide a discrete input to a PLC - Answer-
Pushbutton, selector switch, limit switch
A __ is an example of an actuator that could be controlled by a discrete output from a PLC - Answer-
Motor starter
A/An __ input or output is a continuously variable signal within a designated range - Answer-analog
A discrete output interface module is a designed to provide - Answer-on/off switching of the output field
device
Which of the following input field devices would most likely be used with an analog interface input
module - Answer-Thermocouple
The Allen-Bradley SLC 500 address I:2/4 refers to an - Answer-Input module in slot 2, terminal 4
the purpose of the optical isolator is to - Answer-separate the higher line voltages from the logic circuits
The input module comes from - Answer-internal logic circuitry of the processor
The purpose of the triac switch is to - Answer-turn the load on and off
For the block diagram of the analog PLC control shown, which part has a binary input and analog output
value? - Answer-Output module
The main difference between a PLC and a relay control system is that - Answer-One uses hardwired relay
control logic and the other uses programmed instructions
The symbol in a ladder logic diagram represents a: - Answer-Virtual relay coil
At the start of the PLC scan the: - Answer-Status of all inputs are read
Unlike personal computers, PLCs are - Answer-Equipped with input and output modules
Equipped with a control programming language
Designed for the industrial environment
A human machine interface (HMI) - Answer-Allows the user to monitor a process
allows the user to control a process
can provide a graphical representation of a process
Block No. 1 of the PLC block diagram represents the - Answer-programming device
Block No.4 represents the - Answer-input module
Block No. 5 represents the - Answer-output module
, Which module of the PLC connects directly to field devices such as pilot lights, motor starters, and
solenoids? - Answer-output
A __ is an example of a device that could be used to provide a discrete input to a PLC - Answer-
Pushbutton, selector switch, limit switch
A __ is an example of an actuator that could be controlled by a discrete output from a PLC - Answer-
Motor starter
A/An __ input or output is a continuously variable signal within a designated range - Answer-analog
A discrete output interface module is a designed to provide - Answer-on/off switching of the output field
device
Which of the following input field devices would most likely be used with an analog interface input
module - Answer-Thermocouple
The Allen-Bradley SLC 500 address I:2/4 refers to an - Answer-Input module in slot 2, terminal 4
the purpose of the optical isolator is to - Answer-separate the higher line voltages from the logic circuits
The input module comes from - Answer-internal logic circuitry of the processor
The purpose of the triac switch is to - Answer-turn the load on and off
For the block diagram of the analog PLC control shown, which part has a binary input and analog output
value? - Answer-Output module
