Siemens D7-SYS - Compatible Net Data Structures

Communications configuring
System- and communication configuring D7-SYS - SIMADYN D 3-19
Edition 12.2003
If one of these conditions is not fulfilled, then the synchronizing
transmitter/receiver logs-off with a communications error.
3.1.4.3 Compatible net data structures
The net data structures include information regarding the structure of the
net data to be transferred:
• data regarding the position and data types of the associated net data
The net data of the transmitter and receiver must be structured the same
to permit data transfer between the transmitter and receiver.
The following standardized data types are used:
Standardized data type SIMADYN D data type Length in
bytes
Integer 16 Integer 2
Integer 32 Double Integer 4
Unsigned 8 Bool, Byte 1
Unsigned 16 Word 2
Unsigned 32 Double Word 4
Floating Point Real, SDTIME 4
Octet-String - 1
Time and Date - 6
Table 3-15 Standardized data types
NOTE
The SIMADYN D connection types (e. g. SDTIME) are not used as data
types, as the coupling partner does not always have to be a SIMADYN D
function block.
• Octet string
An octet string is an unstructured data type which does not appear at
the block I/O (refer to the Chapter Channel marshalling blocks CCC4
and CDC4).
• Time and date
Data type for the time which does not appear at the block I/O (refer to
communications utility, message system).
Value range
− 1st octet and 2nd octet:
Specify the date relative to 1.1.1984.
Resolution=1 day
0 days≤d≤65535 days
General
Data types