Specifications

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Additional Functions Section 8-5
Before writing a timer variable to the PLC, the time value and the smallest possible
time base are formed from the terminal-internal unsigned 4-byte value.
d) Floating Point Number
The data with a length of 4 bytes are interpreted in the IEEE floating point format.
e) Binary Variables with a Length of 1, 2 or 4 Bytes
Data with a length of 2 bytes are interpreted in the PLC-conformal byte order for
words.
Data with a length of 4 bytes are interpreted in the PLC-conformal byte order for
long words.
8.4.1 Data Types
Direct accessing of the following data types is possible:
The data types listed below can be accessed in bit, byte or word-mode. The access
modes are distinguished by the abbreviations BY, B and W.
Data type Access
E Input (0 bis 63) Byte address B, BY, W, DW
A Output (0 bis 63) Byte address B, BY, W, DW
M Flag (0 bis 255) Byte address B, BY, W, DW
T Timer (0 bis 127) Timer number BY, W, DW
Z Counter (0 bis 127) Counter number BY, W, DW
BZ Status of PLC RUN/STOP CL500/400 BY
BZ Status of PLC RUN/STOP CL200 W
DP Data buffer (0 bis 511) Byte address BY, W, DW
DF Data field (0 bis 24575) Byte address BY, W, DW
D Data block (0 bis 511) Byte address BY, W, DW
If the size of the data field is defined as a linear area the data field number must be
set to 255.
8.5 Additional Functions
In addition to the random write and read access to PLC variables, a memory area
comprising 12 bytes is specified in the application description as poll area.
Only marginal conditions regarding this memory area are that the PLC must be
able to access in bit-mode and the terminal in word-mode and the memory area
must be contiguous. The location of this memory area can be specified in the appli-
cation description.