Automation System
Timing using a TM990 micro-computer:

both (b) and (c)
None of these
is available on the standard CPU board
require an external timer added by the user
can be handled in software

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

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
All of these
it is impossible to write a control program for a machine in any other logic
None of these

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