Internet PLC Forum

hi I'm new to this group I'm also new to plc stuff
I'm a mature college student and I'm taking a automaion and controll course. in this course i have bee asked to build a ladder logic as a project and I'm looking for help
 
Design a relay logic circuit that will perform the following sequence:
A+A-B+B-C+C-D+DThe
design must incorporate a start/stop circuit using one relay. The other four relays
may be utilized for your control ?LOGIC? if required. The relay logic must be
?LATCHED? in and each step is to be unlatched by the following step. No electrical
?TRAPPED? signals are allowed to occur during the sequence.
Hint: A LOGIC step is equivalent to an air header using air logic.
A full DETAILED explanation of how the circuit operates is required.
You will build and troubleshoot your circuit in the lab.
The circuit can be designed on AutoCAD (Electrical or other version) or any other
software or can be drawn using stencils to proper drafting standards. The detailed
explanation MUST be typed NOT hand written.