ABB PM511V16 3BSE011181R1 Module NEW

Traditional Programming

Traditional programming has a straightforward structure, that is, the design (andexecution) during an execution cycle is determined by the sequential appearance –you start at the top and work your way down.As the program design proceeds, intraditional programming, one is often required to explicitly write the code ifmajor changes are to be made.Furthermore, you have to think carefully what is to happen, and when it is to happen during an execution cycle.Needless to say, the code design will be time-consuming, excessive and difficult to maintain and update,as well as having a poor structural design.

Structured Data Types

An important part of creating re-usable solutions is to use structured data types. These serve as communicators (tunnels) through the application, and can in many cases be used instead of writing code directly in function blocks and control modules. If we implement object-specific code in every place, instead of using variables of structured data types, we would soon narrow down the dynamics and flexibility of the system.

Structured data types can be seen as a thick cable, with each component as a cord inside the cable. The strength of structured data types shows when they are used in connections between types. You can connect control module types (through several layers), without declaring any variables on each module level. One component inside a valve can be directly accessed from a parameter on the outside. If you, later on, need a new component, it will pass through all control module types and control modules with no additional interconnection.

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