PLC (Amatrol Questions)

In a PLC program, arranging two XIC instruction in series provides a(n) _____ logic element.

AND

The Count Up instruction increases the instruction tag's _____ value by one each time the rung containing the counter goes from false to true.

Accumulated (or ACC)

Most automatic machines perform a number of _____ to accomplish the task for which they have been designed.

Actions

An MCR zone uses two MCR coils: one on the _____ and one on the _____.

MCR rung & End MCR rung

A(n) _____ shows how machine action affects the PLC inputs and how the PLC outputs affect machine action.

Power diagram

Program control instructions alter the _____ of a PLC from its normal sequence.

Program Scan

Latch instructions are said to be _____ in that they maintain their state when powered down.

Retentive

A ControlLogix _____ is a collection of program instructions in a single programming language, such as ladder logic, structured text, etc.

Routine

_____ contain the actual operating instruction (or executable code) that determines the operation of the controller.

Routines

_____ comments contain information pertaining to the rung or group of rungs.

Rung comments

The ControlLogix instruction set provides two instructions used to extract data from and insert data into a controller's system data objects: GSV and _____.

SSV

The PLC programs are designed so that the machine stops _____

Safely

Two applications in which interlocks are used are sequencing and _____.

Safety

The basic operation of a PLC is to _____ instructions, monitor the status of input devices, and produce outputs based on the status of the inputs.

Scan

One way of locating component failure is with the five _____.

Senses

The four languages used to program a ControlLogix PLC are _____, Structured Text, Function Block Diagram, and Ladder Logic.

Sequential Function Chart

The _____ instruction converts a decimal data tag, such as the Preset value of a Counter instruction, into a BCD value.

TOD

Two methods of controlling multiple outputs at the same time are; by branching the outputs, & by placing each output on a separate rung and using multiple input instructions with the same _____.

Tags

_____ are text-based names given to PLC memory locations.

Tags

_____ may slow down or even stop the execution of a controller causing it to transition to fault mode.

Controller faults

The _____ dialog is an RSLigix 5000 software utility that displays configuration, operation, and status information offline and online.

Controller's Properties

Studio 5000 provides _____ pre-defined data types to the user that are the building blocks of all tags and tag structures used in ControlLogix projects.

Five

A communication error between an I/O module and the "owner" controller causes the controller to fault, program operation to stop, and the output module's module status indicator (OK) to _____.

Flash Green Output modules' OK flashes Green Controllers' OK flashes Red

The _____ function causes the machine to stop after finishing its current step. It resumes operation beginning with the next step when a start signal is received

Halt

The five types of numbering systems commonly used by PLCs are: decimal, binary, BCD, octal, and _____.

Hexadecimal

The _____ is stored in the controller project and sent to the controller/processor the next time the project is downloaded.

I/O configuration

The _____ shows how the machine's devices are wired to the PLC's inputs and outputs

I/O diagram

The PLC memory, known as a(n) _____, includes firmware, ladder routines, tags, configuration data, and data tables.

Image

The ESM is removed from the PLC by pressing the _____ tab on the module and pulling forward.

Locking

The RSLinx _____ contains shortcuts to the most commonly used menu functions.

Toolbar

Count Down instructions are usually combined with Count Up instructions to form a(n) _____ counter.

Up/Down

Users can configure one of two PLC-encountered conditions that will automatically load the SD card image to PLC memory, _____ and on uninitialized memory.

Upon power-up

The normal operating mode of most machines is the _____ mode.

automatic

PLC routines may use timer as well as _____ to sequence events.

limit switches

Input modules are needed because most input devices cannot be directly connected to the PLC's _____ circuits.

processor

ControlLogix I/O modules are intelligent devices, meaning they have onboard _____.

processors

A BCD thumbwheel switch consists of one or more _____ that each control four data lines.

rotary switches

A subroutine is a program which can be executed by another _____.

routine

The JSR instruction is a program control instruction that causes the processor to run a _____.

subroutine

Programmable Logic Controllers are industrial _____ that control machines and other industrial applications

computers

A PLC time-driven sequencing program operates by using a series of timer instructions with each instruction controlling an _____ in the sequence.

event

The Minor Fault Flag is set when a program _____ causes a Minor Fault to occur

execution

The file extension of an RSLogix 5000 project is _____.

.ACD

ControlLogix timers have only one time base, _____ second.

0.001

All _____ that communicate with the controller must be added to the controller projects _____ configuration.

Devices;I/O

Boolean tags are _____ memory locations used to store the status, such as the on/off condition, of a device or instruction.

1-bit

Type _____ fault codes are typically caused by programming errors and are triggered when the controller cannot execute a command

4

The PLC output _____ should include the NC contacts controlled by the motor starter overload device.

Diagram

A(n) _____ is another name that references an existing tag.

Alias

A program condition that does NOT result in a major processor fault is a(n) _____.

Arithmetic overflow

A(n) _____ is a collection of numerically indexed tags.

Array

A(n) _____ is a name, property, parameter, or value for the device for which the object data applies.

Attribute

A flashing red I/O module status (OK) indicator indicates that the module has a(n) _____ fault.

Communication

When troubleshooting, observing that all PLC indicators are off could be caused by a(n) _____ failure or a bad chassis power supply.

Complete power failure

A tag structure contains _____, fault, and terminal status for a module.

Configuration

Module-defined _____ organize and store information about the module.

Data-types

The FRD instruction is an internal output instruction that converts BCD data, such as an input tag, into a(n) _____.

Decimal equivalent

PLC input/output diagrams are used to show the specific physical connections between _____ and the PLC's I/O terminals.

Devices

The _____ bit is set when the instruction tag's accumulated value is equal to the Preset value.

Done (DN)

RSLinx is a collection of _____ to connect programming software in the PC to Allen-Bradley controllers such as ControlLogix, SLC-500, PLC-5, and other devices.

Drivers

On power up, the ESM module begins charging. The status display shows what?

ESM or CHRG

The _____ function should always be hard-wired into the power-supply of the PLC's outputs.

Emergency Stop

To enable forces, click the forces drop-list on the Online toolbar and select the I/O forcing option, then the _____ option.

Enable All I/O Forces

The Two most popular communication protocols are?

Ethernet & Universal Serial Bus (USB)

The controller's firmware version can be determined by _____ and by _____.

Examining the controller properties; Examining the controller's LED display at power up.

The controller module's _____ indicator flashes amber when forced I/O conditions appear in the user program and appears solid amber when those conditions are enabled.

Force

The outputs of a programmable controller can be used to control an output device directly or _____.

Indirectly

The First Scan Flag is often used in applications to _____ a program to a known state on power-up of the controller

Initialize

_____ a PLC program puts all outputs in startup state and checks inputs to verify that the process can safely be restarted

Initializing

One of the advantages of a PLC is that it permits many instructions to be controlled by one _____ and it does not matter how many of these are XIC or XIO.

Input

Two of the Six basic components of most PLCs are?

Input & Output modules

The first step in testing a PLC input device is to operate the input device and observe the PLC's _____ indicator.

Input Status

MCR instructions can be used as a(n) _____ to allow only a portion of a PLC program to operate at one time

Interlock

One application of a(n) _____ instruction is to control the simultaneous start and stop of several outputs.

Internal output

When the _____ instruction is energized all program logic between it and the LBL instruction is "frozen" in its last state.

JMP

A JMP instruction must always be used with a(n) _____ instruction

LBL

A(n) _____ is an output device that enables a machine operator to view the accumulated or preset value of an instruction without the use of a programming terminal.

LED display

The _____ window is used to develop ladder logic routines for ControlLogix projects.

Ladder Editor

In the module tag Local:1:I.Data, Local refers to the module's _____.

Location

Programmers often use a latch as a(n) _____ device when input conditions are the same at different steps in a routine.

Memory

The Who Active utility can be used to _____ the operation of a PLC.

Monitor

There are two types of transistors used in sensors: _____ and _____.

NPN, PNP

_____ refers to program logic that places one branch circuit inside of another

Nesting

1756-L7x PLCs use a(n) _____ memory to back up memory when power is off.

Non-volatile

In most cases, PLCs use _____ input devices and adjust the input instruction's logic to meet the logic need of the program.

Normally Open

When the _____ instruction is energized, the PLC closes a switch in the output module that applies voltage to a real-world device.

OTE

_____ are data structures used to store status and identifying data about the controller and its operation, hardware, and program.

Objects

Disabling the _____ instruction increases the Accumulated value by the amount of time that the instruction is de-energized. The Accumulated value is reset when the instruction is enabled (rather than a separate RES instruction).

Off-Delay

Input instructions having _____ addresses function as dictated by the state of the OTE output instruction.

Output

When two different machines are interfaced, the input of one machine is activated by the _____ of another.

Output

The _____ instruction writes a 0 to its assigned tag when true but writes nothing (1 or 0) when false.

Output Unlatch (OTU)

The PLC system's MCR circuit provides power to the system's _____.

Output devices

The ControlLogix family of programmable controllers has a test mode that enables the user to test program operation without energizing _____.

Outputs

A(n) _____ is the primary programming device for a PLC.

PC

PLC seal-in logic works by using a second XIC instruction that is connected in _____ with the XIC instruction which turns on the output.

Parallel

The processor's _____ and OK indicators should be solid green if it is operating correctly.

RUN

The PLC OK and SD indicators flash _____ while the load continues.

Red

Solid-state output modules are more commonly used because they switch much faster than _____ contacts and last longer.

Relay

The _____ instruction zeroes a counter tag's accumulated value and clears all of its status bits.

Reset

Multiple safety interlocks can be used by placing input instructions in _____ with each other on a rung.

Series

In industry, automatic machines must perform operations _____.

Simultaneously

Communications drivers are software programs that connect what?

Software to Hardware

A PLC requires much less _____ than a standard computer or relay panel that could do the same job.

Space

Troubleshooting a ControlLogix processor requires using the processor's _____ indicators to determine the operating condition of the processor.

Status

After identifying the problem (or symptom), the next step is to check the _____.

Status indicators

The GSV instruction's Dest field identifies the user-created tag where the data will be _____.

Stored

The PLC project is developed in RSLogix 5000 software, downloaded to the controller, and the image is _____ on.

Stored

To prevent arcing of hard contacts, a(n) _____ _often called a voltage snubber), is connected across the coil leads to short circuit the inductive kick voltage around the output module.

Surge suppressor

In the _____ method of troubleshooting, the troubleshooter isolates the problem in a system according to whether or not the component could cause the symptoms observed

Symptom & Cause

Decimal is a base _____ numbering system and is said to have developed from the fact that most people have ten fingers.

Ten

A BCD _____ is an input device that enables a machine operator to adjust a PLC instruction's preset value without having to use a programming terminal.

Thumbwheel switch

The _____ instruction is used to turn outputs on or off after the timer has been disabled (or off) for a preset time interval.

Timer Off-Delay

After input contact instructions and output instructions (coils & contacts), _____ and _____ are the most commonly used PLC instructions

Timers & Counters

_____ is the process of finding the cause or fault of a machine malfunction.

Troubleshooting

A _____ is a detailed sequence of operation that shows the on/off status of every input and output device/address for each step in the sequence.

Truth Table

The first step in troubleshooting the ControlLogix chassis power supply is to _____.

Verify the power supply is on

_____ is a network search utility that shows the layout of every network that has a driver configured in RSLinx.

Who Active

The two basic types of input instructions used by the ControlLogix 5000 are _____ and _____.

XIC;XIO

If an output device doesn't work even though the corresponding output terminals are energized, the problem is either in the _____ or interface wiring.

device

In a single-cycle program, the start and stop inputs _____ control the output

directly

Each decimal digit of an LED display is controlled by _____ data lines that are wired to four output terminals of a PLC output module.

four

The BCD system uses _____ bits to represent each decimal digit.

four

The TON instruction is similar to the Retentive Timer On instruction; however, the TON instruction tag _____ when the instruction is de-energized.

resets

Expressing numbers greater than the largest-value symbol is done by assigning a weighted _____ to each position from right to left.

value