Model-Driven Design Using IEC 61499 by Li Hsien Yoong Partha S. Roop Zeeshan E. Bhatti & Matthew M. Y. Kuo

Author:Li Hsien Yoong, Partha S. Roop, Zeeshan E. Bhatti & Matthew M. Y. Kuo
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

5.1 Revisiting Delayed Communication

We begin here by revisiting the issue of delayed communication, this time reasoning about it in a more formal manner. Each input and output of a function block can be thought of as a sequence of values in some domain, n. Then for a given domain of values, V n , the sequence associated with it is a function, s n , defining the value at a particular discrete time instant, t, such that s n (t) = v n , where t is some non-negative integer and v n  ∈ V n . By stating that send and receive operations between function blocks must always occur with a unit delay, the assignments from a given output sequence, o, to a given input sequence, i, will effectively take the form of

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