Automation System
The program counter:

None of these
is where arithmetic is done in a computer.
decides which program to run
contains the address of the next instruction to be executed
counts the number of instructions that have been executed

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Automation System
Today, programmable controllers:

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

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