Automation System
What should be first considered in choosing a plotter?

The cost
The hardware you currently own
The application for which it will be used
The type of data you will input
None of these

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
None of these
are more powerful then the first controllers on the market
All of these
are relatively low cost compared with the original digital equipment available for industrial control

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Automation System
Relay ladder logic is used in a PC because:

All of these
it is the best industrial control language ever developed.
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
None of these
it is impossible to write a control program for a machine in any other logic

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