The chart below shows a required set of step sequences with the same time interval between steps.

Provide a ladder diagram and a comprehensive explanation as a solution for this chart by using two eight-bit shift registers (SFT0 controls relays 50 to 57. SFT1 controls relays 60 to 66). The sequence is to have an initial start signal and thereafter can be free running. A reset control and timer to clock the shift registers must be provided.

STEP NO. OUTO OUT1 OUT2 OUT3 OUT4 OUTS all outputs off RESET 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Return to step 2 ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON RESET 1 2 3 4 5 6 7 8 9 10 11 12 13 14 STEP 1 and 15