Overseas regular IEC 61131-3 PROGRAMMABLE CONTROLLERS – half three: Programming languages

This a part of IEC 61131 specifies syntax and semantics of programming languages for programmable
controllers as outlined partially 1 of IEC 61131

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Extra info for IEC 61131-3 Programmable controllers - Part 3: Programming languages

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1) NOTE 1 The usage of these keywords is a feature of the program organization unit or configuration element in which they are used. 7. NOTE 2 Examples of the use of VAR_IN_OUT variables are given in figures 11b and 12. 1. b The RETAIN and NON_RETAIN qualifiers may be used for variables declared in VAR, VAR_INPUT, VAR_OUTPUT, and VAR_GLOBAL blocks but not in VAR_IN_OUT blocks and not for individual elements of structures. c Usage of RETAIN and NON_RETAIN for function block and program instances is allowed.

2 Initialization The default initial value of an enumerated data type shall be the first identifier in the associated enumeration list, or a value specified by the assignment operator “:=”. 2, the default initial values of elements of data types ANALOG_SIGNAL_TYPE and ANALOG_SIGNAL_RANGE are SINGLE_ENDED and UNIPOLAR_1_5V, respectively. For data types with subranges, the default initial values shall be the first (lower) limit of the subrange, unless otherwise specified by an assignment operator.

The maximum allowed length of STRING and WSTRING variables is an implementation-dependent parameter. Table 12 - Data type declaration features No. 16] OF ANALOG_DATA ; END_TYPE --``,`,`,,,``````,,``,,``,,,,`,-`-`,,`,,`,`,,`--- Copyright International Electrotechnical Commission Provided by IHS under license with IEC No reproduction or networking permitted without license from IHS Licensee=Technip Abu Dabhi/5931917101 Not for Resale, 02/12/2006 07:01:30 MST 61131-3  IEC:2003(E) – 34 – Table 12 - Data type declaration features No.

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