This page describes a graphical representation of the designer control algorithms for object with reference to the input-output table. This is necessary so that the programmer could most correctly implement the code of programmable automation tools object (controller) in accordance with the requirements of the designer. This document is the link between the designer and programmer, implementing application software.
Control algorithms should cover most of the object technology to the PLC programmer and / or visualization system programmer no difficulty in reading the technical specifications.
In the description of the state of the control algorithms for all the objects must be taken into account, as well as any possible violations of the technological equipment.
Below are the options for the graphical representation of the designer object management algorithms.
1. Functional blocks.
This option is well suited for large-scale petrochemical facilities and allows you to specify a chart of simultaneous information on the inputs and outputs associated with the algorithm, the output information manager (operator) and the algorithm itself.
2. Description of Finite Automaton
This representation is convenient to describe any relatively complex sequences. A prerequisite of this presentation is the presence of state tables and transition conditions.
3. Description of Block Diagram
The approach adopted in the description of algorithms in the world and, despite a number of shortcomings (difficulty in binding to the input-output tables), is well suited to describe any sequence.
This description is well suited for small systems, it is convenient and clear for staff. You can quite quickly and quite specifically approve a list of conditions and the sequence of transitions.Russian version