TRUTH TABLES AND EXERCISES
Identify by number the following logic symbols.
As drawn, with the hand switch in the AUTO position and no safety signal present,
what is the status of the two inputs to Gate 4, on or off?
Since electrical components are drawn in their de-energized state, and using the answer
from Question 2, is the flow solenoid valve (FSV-1-147) in its correct position? Why?
How many ways can FSV-1-147 be energized? De-energized?
If a safety signal is present, can FCV-1-147 (valve FSV-1-147 energized) be opened?