Understanding of logic in ladder program with its transformation into sequential graph using state space-based approach Online publication date: Sat, 12-Jul-2014
by R.K. Vimal Nandhan; N. Ramesh Babu
International Journal of Mechatronics and Manufacturing Systems (IJMMS), Vol. 6, No. 2, 2013
Abstract: This paper presents an approach to understand the logic in ladder diagram (LD)/LD program by transforming it into a sequential function chart (SFC). Transformation of LD into SFC is done by employing state-space-based approach and rule-based heuristics. State space approach generates all possible states of the system, being controlled by LD, by assuming the occurrence of various events in the manufacturing system in an asynchronous manner. From all these states, practically feasible states that conform to heuristic rules developed for various control elements in the system are identified. From these feasible states, the sequence of occurrence of states, i.e., sequence graph is derived by a heuristic that relies on the essential input conditions activating each output in the LD. The effectiveness of the proposed approach is demonstrated with several case studies, representing increasing levels of logical complexity in the respective ladder diagrams.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Mechatronics and Manufacturing Systems (IJMMS):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com
Our Blog 
Follow us on Twitter 
Visit us on Facebook