Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 963)

L-force | PLC Designer
Programming Reference
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DMS 4.1 EN 03/2011 TD29 961
(1) Variable names
The naming of variables in applications and libraries as far as possible should follow
the Hungarian notation:
For each variable a meaningful, short description should be found, the base name.
The first letter of each word of a base name should be a capital letter, the others
should be small ones (Example: FileSize).
Before the base name, corresponding to the data type of the variable, prefix(es) are
added in small letters.
See in the table some information and the recommended prefixes on the particular
data types:
Data type lower limit upper limit
Information
content Prefix Comment
BOOL FALSE TRUE 1 Bit x *
b reserved
BYTE 8 Bit by Bit string, not for
arithm.
operations
WORD 16 Bit w Bit string, not for
arithm.
operations
DWORD 32 Bit dw Bit string, not for
arithm.
operations
LWORD 64 Bit lw not for arithm.
operations
SINT -128 127 8 Bit si
USINT 0 255 8 Bit usi
INT -32.768 32.767 16 Bit i
UINT 0 65.535 16 Bit ui
DINT -2.147.483.648 2.147.483.647 32 Bit di
UDINT 0 4.294.967.295 32 Bit udi
LINT -2 63 2 63 - 1 64 Bit li
ULINT 0 2 64 - 1 64 Bit uli
REAL 32 Bit r
LREAL 64 Bit lr
STRING s