PROGRAMMABLE LOGIC CONTROLLERS FINAL
The selection of manual or automatic switch should be based on all of the following expect:
None of the above
Light-emitting diode (LED) and laser diodes are used in____ sensor.
Optical
The 6-pin push button stainless steel switch's backside has 2 pins in the middle, they are?
Both normally closed and held closed.
The _____ report displays the number of slots available on the PLC.
I/0 configuration
The main reason to connect a normally open switch's pin to an LED light's positive terminal is to supply power when the button pressed.
True
There are ______ rules accepted as standard in the control industry for creating relay logic diagram.
Nine
In order to change the program, the PLC must be in ____ mode.
Offline
Slowly accelerating a motor from a standstill to operating speed is referred to as:
Soft Start
A ____ sensor detects an object through the change in the sensor's dielectric
Capacitive
Ultrasonic sensors used sound waves with frequencies above ____ kHz in order to detect the distance to an object.
16
______ are placed on the top of each rung and typically describe the majort function of the following rungs.
Comments
The ____ detects over current thorough the magnetization when the line current genrates.
Magnetic overload relay
The ______ coil causes the relay's contact to either close or open.
Magnetized or demagnetized
Which file holds the PLC ladder logic program?
Main program file.
You can place _____ output device per rung, so you cannot place any output devices in series.
Only one
The normally _____ pushbutton and switches are always open until they are forced to closed.
Opened
The _____ scan rate is the time required to execute the PLC ladder diagram once.
Operational
A _____ sensor uses visible, ultraviolet, infrared, or laser lights and requires both an emitter to generate the light beam and a detector.
Optical
Rule two states that one (and only one) ______ is placed near the right corner of the rung.
Output
The _____ logic diagram is used to program the programmable logic controller (PLC).
PLC ladder
_____ applications are useful where the motor is to reverse its direction of rotation.
Plugging
PLC program execution, or program ____, flows from left to right on each rung, starting from the top rung and continuing to the bottom rung
Program scan
A relay is a device that acts on the same basic principle as the ____ switch.
Reed
A _____ is created to show the logical relationship between devices.
Relay logic diagram
The ____ dialog box is devided up into the section labeled General, Data Files, Program Files, Special, Data Base, and Miscellaneous Layout Options.
Report Options
According to rule four, output devices cannot be connected in _______.
Series
A _____ is a control device that uses electromagnetism to convert electrical energy into mechanical motion.
Solenoid
An Allen-Bradley SLC 500 series PLC has timers addressed from _____ to _____.
T4:0, T4:255
The two main sections of motor starters are ____ and overload protection.
Contactor
In general, a relay consists of a magnetic core and its associated coil, ____ spring, armature, mounting, and terminals.
Contacts
The 6-pin push button stainless steel switch's backside has 2 pins in the middle, if they are normally closed, they can be used to keep power supply to the escalator.
False
There are huge difference between manaual and automatic transfer switches. Manual uses push and pull relay logic, and the automatic uses plug and unplug methods.
False
The main ladder logic diagram is held in _____.
File 2 or LAD 2
A ____ switch is used to factory environment as an emergency or contact switch when a worker is using both hands to assembling a product.
Foot
A method of testing the PLC system without actually closing or opening input devices is to test the PLC in the ____ mode.
Forced condition
A _____ sensor is basically a semiconductor device (transistor) that can be switched by magnetic fields.
Hall effect
According the rule six, all the input and output devices must be placed _____.
Horizontally
A ____ sensor detects the presence of nearby metallic objects by measuring changes in magnetic fields.
Inductive
You can place as many ______ as desired in series or in parallel in one rung in a relay logic diagram.
Input devices
An Allen-Bradley SLC 500 series PLC has counters addressed from ______ to _____.
C5:0, C5:255
A normally closed switch moves away from the stationary contact upon pressing the button.
True
In a normally open high temperature switch, when it is closed, the circuit send a signal that the temperature is reached maximum limit.
True
File number ____ and ____ are system files.
0 and 1
A ____ relay is typically used in the control of low-power circuits or other relays.
Control
You must energize the ____ coil to close an XIC Latch/Unlatch contact.
Control Relay
In the relay logic diagram, _____ must flow from left to right.
Current
The _____ section allows you to print address and symbols woth their description, instruction comments, and symbol groups.
Data base
In the solenoid, when the coil is _____, the plunger returns to its normal position because of the spring action.
De-energized
When no power is going, the function of a spring in a normally open switch is to:
Disengage two conducting points .
XIC is an acronym for ____.
Examine if closed
XIO is an acronym for ______.
Examine if open.
In the solenoid, when voltage is applied, the current through the coil produces a ______ .
Magnetic field
A normally open contact disconnects two conducting points upon pressing the button.
False
A _____ simply turns a motor on and off
Motor starter
Input devices can be represented ____ in a relat logic diagram
Multiple times
An Allen-Bradley SLC 500 series PlX has integer words addressed from ____ to _____.
N7:0, N7:255
To latch or unlatch a contact, two ____ are used.
Pushbuttons
The control registers for an Allen-Bradley SLC 500 series PLC are addressed from ____ to ____.
R6:0, R6:255
Which data file holds the error messages?
Status (S2)
