Computer Aided Design Of Relay Ladder Logic Via State Transition Diagram
Rajagopalan Devanathan, Foo Y. Kuan, Chang C. Jun, Choo S. Aun · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1987
Programmable logic controllers (PLCs) are commonly programmed using relay ladder logic. There are many disadvantages to this approach. The state transition diagram affords a systematic means of providing precise and unambiguous specification while at the same time yielding a good system overview for ease of troubleshooting and maintenance. Computer aided logic design techniques help to automate the process of relay logic design for the state transition diagram. A software package which runs on an IBM PC/compatible machine has been developed to automatically transform the state diagram specification into relay ladder logic and the associated (PLC dependent) source code.