Chapter 27 PLC's

A _______ voltage tester must never be used to measure voltage levels on a programmable controller.

Vibrating

Like PLC's, PLR's are designed to be programmed using _______ programming or function blocks.

Line

Electrical ______ is unwanted signals that are present on a power line.

Noise

The main advantage of programmable ______ _______ is that they combine the latest technologies, programming methods, and communication networks of PC's with the latest technologies of PLC's.

Automation controllers

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

PLC

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 DMM's.

I/O

Every time an I/O device on a programmable controller is programmed, the device must be assigned an _________.

Address

_____-______ programming is the use of a PC to program a programmable controller that is not in the 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, HMI's, data acquisition of process conditions, motion control, servo/stepper motor control, and or vision control.

PAC

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

Resistor

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

Scan

To aid in interfacing and monitoring a programmable-based system, a _______ port is used for monitoring and programming a system using a computer.

Serial

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

program

________ 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

_______ I/O's are the most common inputs and outputs.

Discrete

A _____ 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

Extreme caution must be used any time a programmable controller's _____ _____ lamp is energized.

Forced I/O

A ________ circuit is used to suppress a voltage spike.

Snubber

A ______ ______ operation is an operation that has feedback from the output to the input.

Closed loop

A _______ 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

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

Line

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

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

Programming

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

A typical controller scan starts in the _____ -_______ corner of the line diagram.

Upper-lect