Automation System
When a computer fetches an instruction, the binary code representing the instruction appears on the:

I/O address bus
input data bus
output data bus
None of these
memory data bus

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Automation System
Today, programmable controllers:

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

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