Lenze DDS v2.0 Bedienungsanleitung PDF herunterladen (Seite 12)

Introduction to IEC 61131-3 programming

General language elements

DDS-IEC61131 EN 2.0

Integers can be defined with a basis, decimal numbers can also have a sign (+ or -). Reals can also

be indicated with exponents.

Identification Example

Integers

decimal 10

binary 2# 2#1010

octal 8# 8#12

hexadecimal 16# 16#A

Reals

without exponent -12.50

with exponent E 15.7E4

Times

There are two different time literals: Duration and time of day/date.

Identification Example

Duration T# or TIME# T#10ms

Time of day/date

Date D# or #DATE D#1999-08-29

Time of day TOD# or #TIME_OF_DAY TOD#15:36:30

Date and time of day DT# or #DATE_AND_TIME DT#1999-08-29-15:36:30

4.5 Data types

IEC 61131-3 defines different standard data types. They help to compile derived and user-defined

data types. Each identifier is assigned to a data type. The type determines how much memory is

to be reserved and which values correspond to the memory contents.

Standard data types

• BOOL (truth values TRUE/FALSE)

• BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT, UDINT (integer data types)

• REAL (floating point data type)

• STRING (character string)

• TIME, TIME_OF_DAY, DATE, DATE_AND_TIME (timedatatypes)

Defined data types:

• ARRAY (one, two, three-dimensional field)

• POINTER (contains addresses of variables/function blocks for the run-time of the program)

• Enumeration (

enumerated

, consists of many string constants)

• STRUCT (structure)

• Reference (generates an alternative name for a variable/constant/function block)

Show/Hide Bookmarks

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 25 26

Keine Kommentare

Lenze DDS v2.0 Bedienungsanleitung Seite 12