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Extra info for Practical Industrial Programming using IEC 61131-3 for PLCs

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There is also the ELSIF construct, which operates thus. IF THEN ELSIF THEN ELSIF THEN ELSE ENDIF; Structured text 53 Statement 1 is executed if condition 1 is fulfilled. Statement 2 is executed if condition 2 is fulfilled. Statement 3 is executed if condition 3 is fulfilled. If none of the above conditions are fulfilled then Statement 4 is executed. It is assumed that conditions I, 2 and 3 are mutually exclusive.

This is to ensure that the compiler is able to handle the code correctly and also to be certain that the target PLC capabilities are not exceeded. 9 Summary • • • • • • • • Structured Text (abbreviated as ST) is a high level textual language similar to PASCAL ST uses a strong data typing and so avoids errors due to type mismatch It is possible to represent complex process logic conditions using various features of the language Variables are declared and used to denote process conditions and to perform the required process operations Operators are defined in the language for arithmetical and boolean operations as well as for comparison Programs, Function blocks and functions can be written using Structured Text language Programs can use Function blocks and Functions by using the calls provided in the language Syntax of statements includes features such as conditional and iterative execution 5 Function block diagram This chapter contains information on the graphical programming language Function Block Diagram (FBD) described in IEC-1131 part 3.

4 Comments As we have discussed earlier, comments in the code serve to explain the flow and purpose of the code so that its understanding and maintenance become easier. Comments are placed between the set (* and *). Instruction List language puts some restrictions on the placement of comments. Otherwise, comments can be placed wherever a space can be interposed. Nested comments are NOT permitted. Multiple lines of comments are permitted. 2 Elementary data types Modern PLC systems have to handle a wide variety of data.

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