Specifications

Additional Functions Section 5-5

5.4.2 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 time value

KZ 000 to 999

Variable represented as 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

5.5 Additional Functions

In addition to the random write and read access to PLC variables, a memory area

comprising 11 (12) bytes is speciﬁed in the mask deﬁnition as poll area. The loca-

tion of this memory area can also be speciﬁed in the mask deﬁnition.

Only marginal conditions regarding this memory area:

- the PLC must be able to access in bit-mode and the terminal in byte-mode

- the memory area must be contiguous.

Byte-structured Memory Mapping

The data area comprises a maximum of 11 bytes

Example: The cyclic poll area is set to ﬂag byte MB12 in the programming system.