programmable logic controller with structured programming language.

摘要

Programmable controller, of the type comprising: - means (2) of input interfacing with sensing circuit boards (4), - means (16) of output interfacing with actuating circuit boards (18), - means (17) of communicational interfacing with programmed systems (19) comprising other programmable controllers, - processing means (8) comprising a monitor (10) as well as a memory (14) which is able to contain updated values of the input states and previous values of the output states, which are stored each cycle under the supervision of the monitor (10), and laws for updating the output states as a function of these values and - user interface means (20) for programming and modifying the said laws. According to the main characteristic of the invention, the memory (14) is broken up into several sections each consisting of items which can be programmed and modified via the user interface (20). The sections comprise in particular graph items and combinatorial event items hierarchised to permit the structuring of application programs for the controller. IMAGE