Programmable Logic Controller (PLC) Questions and Answers
Suppose we have an Allen-Bradley model PLC connected to a pair of pushbutton switches and light bulbs as shown in this illustration:
Examine the following relay ladder logic (RLL) program for this Allen-Bradley PLC, determining the necessary switch statuses to energize lamp Y, and the necessary switch statuses to energize switch Z:
- To energize lamp Z: press switch B, release switch A.
- To energize lamp Y: press switch A, release switch B.
Share Your Answer / Comments
Credits : Tony R. Kuphaldt – under CC BY 1.0
For More PLC Questions : CLICK HERE