Automation System
Most continuous control actuators:

None of these
are of the time proportioning type
(b) and (c) above
use a 4 to 20 mA current loop input
are used with standard continuous control loop

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Automation System
Microcomputer-based control sys-tems

None of these
will tend to increase in cost.
All of these
will just keep their present capability
will have more standard industrial application software available in the future.

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