Automation System
Ergonomics refers to:

the level of involvement the operator has with the workstation
the cost relationship of the workstation versus productivity
the human aspect of the environment around the workstation as well as the workstation itself
the technology involved in the workstation itself
None of these

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Automation System
How is the integral mode implemented on a digital controller?

the error is divided into discrete amounts
the digital controller cannot handle integral mode
the error signal is summed over a discrete time interval and accumulated by the controller
None of these
All of these

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

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

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