Discuss Some of the Major Effects of the Global Spread

question 38

Essay

Discuss some of the major effects of the global spread of consumerism.

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Definitions:

Off Delay Cycle

A control or timing function where a signal or operation is delayed from turning off after an input trigger is removed.

MCR Instruction

Master Control Reset, an instruction used in programming PLCs to control the execution of a block of logic or instructions between its start and end points.

Nonretentive Outputs

Output signals or data in a control system that do not maintain their state after a power cycle or reset.

Latch Instruction

One-half of an instruction pair (the second instruction of the pair being the unlatch instruction) that emulates the latching action of a latching relay. The latch instruction for a programmable logic controller energizes a specified output point or internal coil until it is de-energized by a corresponding unlatch instruction.