Suppose we have a PLC connected to three pushbutton switches as shown in this illustration:
In the above diagram :
- 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:
Also, determine the status of the lamp connected to the PLC’s Y1 output.
- Switch A = pressed
- Switch B = released
- Switch C = released
The lamp will be de-energized.
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Credits : by Tony R. Kuphaldt – under CC BY 1.0