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IEC 61131-3 Data types

10-1

l DDS EN 2.3

10 IEC 61131-3 data types

10.1 Standard data types

Standard or user-defined data types may be used for programming. Each identifier is assigned to

a data type to define how much memory is to be reserved and which values correspond to the

memory contents.

Standard data types are:

• BOOL

• Integer data types

(BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT, UDINT)

• REAL

• STRING

• Time data types

(TIME, TIME_OF_DAY, DATE, DATE_AND_TIME)

10.1.1 BOOL

Variables of type BOOL can be TRUE or FALSE and are subject to an 8-bit memory reservation.

10.1.2 Integer data types

Integer data types include BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT, UDINT.

Different data types cover different numerical ranges. The following range limits apply to integer data

types:

Type Lower limit Upper limit Memory

Byte 0 255 8bits

Word 0 65535 16 bits

DWORD 0 4294967295 32 bits

SINT -128 127 8bits

USINT 0 255 8bits

INT -32768 32767 16 bits

UINT 0 65535 16 bits

DINT -2147483648 2147483647 32 bits

UDINT 0 4294967295 32 bits

As a result, information may be lost when converting higher-order types to lower-order types.

10.1.3 REAL and LREAL

REAL and LREAL are so-called floating-point types required for the use of rational numbers. The

reserved memory capacity amounts to 32 bits or 64 bits.

Note!

LREAL is not supported by the Lenze target systems.

Process REAL data types only in the PLC_PRG context. System errors may occur.

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Lenze DDS v2.3 Bedienungsanleitung Seite 257