Specifications

Data Type Structure Section 1-4

1.4.1 Data Types

Direct accessing of the following data types is possible:

E input bits (bit access, read-only)

A output bits (bit access)

M ﬂag bits (bit access)

EB input bytes (byte access, read-only)

AB output bytes (byte access)

MB ﬂag bytes (byte access)

EW input word (word access, read-only)

AW output word (word access)

MW ﬂag word (word access)

ED input double word (double word access, read-only)

AD output double word (double word access)

MD ﬂag double word (double word access)

DW data word (word access)

DL data word, left (high) (word access)

DR data word, right (low) (word access)

DD data double word (double word access)

T timer (word access, read-only)

Z counter (word access, read-only)

The size of each data area depends on the CPU of the PLC.

1.4.2 Special Simatic Data Formats

The following data formats are supported in the editors:

KB 0 to 255

Variable in byte format

KF -32768 to +32767

Variable in 16-bit ﬁxed point number format

KH 0000 to FFFF

Variable in 4-digit hexadecimal number format

DH 00000000 to FFFFFFFF

Variable in 8-digit hexadecimal number format

KC !! to zz (2 ASCII-characters each)

Variable represented by 2 characters in ASCII format

KT 000.0 to 999.3

Variable represented as a time value

KZ 000 to 999

Variable represented as a count value

KG ±1.2*10-38 to .±3.4*10+38

Variable in 32-bit ﬂoating point number format

KM 00000000 00000000 to 11111111 11111111

Variable in bit pattern format