Programmable Logic Controller (PLC) Questions and Answers
Suppose we have a PLC connected to three pushbutton switches as shown in this illustration:
X1 to X4 : Digital Inputs
Y1 to Y4 : Digital Outputs
Determine the switch actuation statuses (i.e. pressed versus released) given the “live” display of the ladder logic program shown here:
Answer :
Necessary switch statuses:
- Switch A = released
- Switch B = released
- Switch C = pressed
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problem # 7:
“Determine the switch actuation statuses (i.e. pressed versus released) given the “live” display of the ladder logic program shown here:”
The correct answer should be
Switch A = pressed
Switch B = pressed
Switch C = released
If your question asked to provide the appropriate push button states to turn lamp Y1 on, then your answer would have been correct (unless I am overlooking something that I did not catch)
I think, SR have corrected properly.