Chapter 27 programmable controllers

A ____ voltage tester (wiggy) must never be used to measure voltage levels on a programmable controller

Vibrating

Electrical _____ is unwanted signals that are present on a power line

Noise

A(n) ____ operation is an operation that has feedback from the output to the input

Closed loop

______ programming is the use of a PC to program a programmable controller that is not in run mode

Off line

The input status indicator located on the input module should turn off and the input symbol should no longer be highlighted in the control circuit on the monitor screen when an NC input device is ____

Open

A ____ can be used if a control system requires remote monitoring, HMIs,data acquisition of process conditions, motion control, servo/stepper motor control, and/ or vision control

PAC

In general, a _____ is considered the first choice for controlling industrial electrical circuits and systems

PLC

A PLC consists of a power supply, _____ section, input section, and output section

Processor

The ____ section is the brain of a programmable controller and can be referred to as the central processing unit(CPU)

Processor

In the ____ mode of a programmable controller, a circuit is monitored and the program is edited, changed, saved, and transferred

Program

A _____ diagram is a line diagram that better matches the language of the programmable controller

Programming

The leakage current problem caused by using a two-wire thyristor output can be corrected by placing a load ____ across the device

Resistor

_____ time is the time it takes a programmable controller to make a sweep of the program

Scan

To aid interfacing and monitoring a programmable- based system, a(n) ____ port is used for monitoring and programming a system using a computer

Serial

A typical controller scan starts in the ____ corner of the line diagram

Upper left

A(n) ____ bit is the controlled contact (or output) that changes from open or closed (OFF to ON) after the preset time (or number of counts) has been reached

Done

Care must be taken when using the _____ command because it overrides all safety features designed for the program

Force

A programmable controller's ____ lamp should normally be energized

Forced I/O

A programmable controller's power supply may provide power for the _____ modules

I/O

Most hardware problems are found in the _____ sections of the controller and usually can be found using standard DMMs

I/O

A(n) ____ circuit is used to suppress a voltage spike

Snubber

Every time an I/O device in a programmable controller is programmed, the device must be assigned a(n) ____

Adress

______ processing blends sequential, step-by-step functions with continuous closed-loop control

Batch

When an output device does not operate, the problem may lie in the output module, output device, or _____

Controller

A(n) _____ file is a group of data values, such as inputs, timers, counters, and outputs, that are displayed as a group and whose status may be monitored

Data

Examples of ____ inputs are potentiometers, rheostats, encoders, bar code readers, and temperature, level, pressure, humidity, and wind speed transducers

Data

_____ I/Os are the most common inputs and outputs

Discrete

Like PLCs, PLRs are designed to be programmed using ___ programming or function blocks

Line

The first programmable controllers used _____ diagrams as a language to input information

Line

The main advantage of programmable _____ is that they combine the latest technologies, programming methods, and communication networks of PCs with the latest technologies of PLCs

Logic relays

The first programmable controllers where developed to eliminate individual control relays and _____ by consolidating them into one unit that could be programmed and reprogrammed as required by the application

Timers