Lenze DDS v2.3 - Manual (Page 258)

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IEC 61131-3 Data types
10-2
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DDS EN 2.3
10.1.4 String
A variable of type STRING can hold variable-length sequences of characters. The size specified for
memory reservation in the declaration is character-based and may be given in round or square
brackets. Where no value has been specified (1 to 255), the default is assumed as 20 characters.
Example of a 20-character string declaration:
str:STRING(20):=’This is a string’;
10.1.5 Time data types
The data types TIME, TIME_OF_DAY (in short TOD), DATE and DATE_AND_TIME (in short DT) are
processed internally like DWORD.
•
TIME and TIME_OF_DAY specify time in milliseconds, with the count starting at TOD 00:00
o’clock.
•
DATE and DT specify time in milliseconds, starting with the 1st of January 1970 at 00:00
o’clock.
•
In the time specification, h = hours, m = minutes, s = seconds and ms = milliseconds.
Example
TIME #2h4m12s123ms
10.2 Defined data types:
10.2.1 Array
One, two, and three-dimensional arrays of elementary data types are supported. Arrays can be
defined in the declaration part of an organization unit or in a global variable list. Structures may also
form arrays.
Syntax:
:ARRAY [..,..] OF .
•
, specify the lower field range limit.
•
, specify the upper field range limit.
•
Limit values must be integers.
The following syntax is used to access components of arrays in the case of a two-dimensional field:
[Index1,Index2]
Example:
Declaration
Card game : ARRAY [1..13, 1..4] OF INT;
Implementation
Card game[9,2]
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