Siemens S7-200 - Receiving and Archiving Data Records in S7-300, S7-400, and WinAC

Principle of Operation
Micro Automation Set 14 Entry ID 21062588
V2.0 05/18/05 15/35
Copyright © Siemens AG 2005 All rights reserved
Set14_DocTech_V2.0_en.doc
4.3 Receiving and archiving the data records in S7-300, S7-400 and
WinAC
Table 4-3
No. Function Comment
1.
The central processing units of S7-300,
S7-400 and WinAC station receive data
from S7-200 “Basis” in a receive buffer.
2.
The archive data block has room for 90
data records consisting of 20 data fields.
One data field consists of 8 bytes user
data. Using self-defined data types
(UDTs), this structure is emulated for the
archive data block. The eight bytes user
data can be handled as a data type and
copied as often as desired.
3.
Due to a relative addressing of the data
records in the archive data block, a new
data record is added to the already
existing data records during each new
write procedure. If the archive data block
is full, the oldest archive data are
overwritten.
4.
The job for archiving the 20 data fields at
the receive buffer in the archive data
block is issued if all 20 data fields have
been received and if consistency is
ensured.
Data available: OK
Consistency: OK
Create pointer
Copy data
78 98
55
DB1
55
78
98
Input buffer
Archive
Datafield1;UDT1
Datafield2;UDT1
Datafield3;UDT1
Datafield4;UDT1
Datafield5;UDT1
Data field1
Hour;Byte
Minute;Byte
Second;Byte
Day;Byte
Month;Byte
Year;Byte
Value; Word
Variable name
Data type
Data type Variable name