Siemens SINUMERIK 828D Function Manual page 1105

Complex data types
TONR
CTU
CTD
CTUD
The Programming Tool PLC828 has two data type check stages:
1. Elementary data type check
For the elementary data type check, if a symbol or a variable is assigned a data type, then all data types are
automatically assigned, which correspond to the bit size of the user-defined data type. If, for instance, you specify
DINT as data type, then the local variable is also automatically assigned the DWORD data type, because both
data types are 32-bit types. The REAL data type is not automatically assigned although it also involves a 32-bit
data type. The REAL data type is defined so that it does not have any equivalent data types: it is always clear.
The elementary data type check is only performed when using local variables.
User-defined data types
BOOL
BYTE
WORD
INT
DWORD
DINT
REAL
2. No data check
This mode is only available for global variables where no data types can be specified. If a data type check is not
active, all data types of the same size are automatically assigned to the symbol.
Example:
A symbol, which is assigned to address DB1400.DBD4, then the following data types are automatically assigned
by the programming software: DWORD, DINT and REAL.
User-defined address
DB1400.DBX0.0
DB1400.DBB0
DB1400.DBW2
DB1400.DBD4
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Description
Switch-on delay, latching
Up counter
Down counter
Up-down counter
Equivalent data type
BOOL
BYTE
WORD, INT
WORD, INT
DWORD, INT
DWORD, DINT
REAL
Assigned equivalent data type
BOOL
BYTE
WORD, INT
DWORD, DINT, REAL
P4: PLC for SINUMERIK 828D
Memory area
100 ms T0 ... T15
10 ms from T16
C0 ... C63
C0 ... C63
C0 ... C63
14.3 Programming
1105