When the NO PB is pressed, a 20-second timer begins. Throughout the 20 seconds that the timer is timing, an output will illuminate a pilot light in various ways, called “default operation.” First 5 seconds – solid; next 5 seconds - .5 second on/.5 second off; next 5 seconds .25 seconds on, .25 seconds off; final 5 seconds - .1 second on, .1 second off. The operation should be able to restart at any point by re-pressing the NO PB.
20 Second Timer
0-5s 5-10s 10-15s 15-20s
Output: solid Output: .5/.5 Output: .25/.25 Output: .1/.1
If the “Fast Forward” button is pressed, the routine IMMEDIATELY jumps to the final 5-second operation and then concludes. If already in the final 5 seconds, it should finish and stop. Draw a pseudo ladder logic diagram.