WEEK 2 PLC

DEVICES

100

an electrical component that acts as a one-way regulator for current.

Diode

200

convert alternating current (what we call AC) into direct current (or DC).

bridge rectifier

300

emits light when an electrical current is passed through it.

LED

400

Invented in 1957, an __?__ can be used as a controlled switch to perform various functions such as rectification, inversion and regulation of power flow.

SILICON CONTROLLED RECTIFIER 

500

The control method used with __?__ is phase control. By chopping up the sine wave into fragments, a load can be switched on at any point during an AC half-cycle

TRIAC

LADDER LOGIC

100

Ladder logic uses __?__ in its programming language instead of __?__

GRAPHICS/TEXT

200

logic diagrams are drawn with two vertical lines, called?

RAILS

300

WHWHEN "EXTENDING" THE RUNG IN THE lADDER lOGIC, WHAT IS THE NAME OF THE LOGIC SYMBOL?

BRANCH RUNG

400

symbols are the logic __?__ that make it possible to create a Ladder logic

INSTRUCTIONS

500

When you begin to draw ladder logic on the computer, __?__ will be executed.

ONE LINE AT A TIME

PROGRAMMING

100

A __?__ IS THE MOST COMMONLY USED PROGRAMMING DEVICE

PC

200

HANDHELD UNITS ARE USED FOR WHAT?

TROUBLESHOOTING 

300

WHAT ARE THE 2 COMPONENTS OF THE MEMORY IN A PLC? 

PROGRAM AND DATA

400

USING A PARALLEL DATA COMMUNICATIONS LINK, WHAT DOES THE PC PROGRAM COMMUNICATE WITH?

PROCESSOR 

500

1) LOWER INITIAL COST

2)LESS PROPRIETARY HARDWARE AND SOFTWARE REQUIRED 

3)SPEEDY INFORMATION PROCESS

ADVANTAGES OF A PC BASED CONTROL SYSTEM