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Extra resources for IEC61131-3 Programming industrial automation systems

Sample text

One very important goal of the standard is to restrict the variety and often implicit meanings of block types and to unify and simplify their usage. 5. g. 5 shows, IEC 61131-3 reduces the different block types of PLC manufacturers to three unified basic types. Data blocks are replaced by FB data memories (“instances”, see below) or global multi-element variables (see also Chapter 3). 1. The three POU types of IEC 61131-3 with their meanings These three POU types differ from each other in certain features: - Function (FUN).

Finally, the relationship between FB instances and conventional data blocks (DB) will be explained. Relationship between FB instances and data blocks. Before calling a conventional FB, which has no local data memory (besides formal parameters), it is common practice to activate a data block containing, for example, recipe or FB-specific data. Within the FB the data block can also serve as a local data memory area. This means that programmers can use a conventional FB with individual “instance data”, but have to ensure the unambiguous assignment of the data to the FB themselves.

An FB (for example a counter or timer block), when invoked with the same input parameters, will yield values which also depend on the state of its internal (VAR) and external (VAR_EXTERNAL) variables, which are retained from one execution of the function block to the next. - Program (PROG). This type of POU represents the “main program”. All variables of the whole program, that are assigned to physical addresses (for example PLC inputs and outputs) must be declared in this POU or above it (Resource, Configuration).

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