Table 5-4 Db Structure - Machine Data - Siemens SIMATIC FM 453 Manual

Defining Parameters of the FM 453
Data Bloc Table 5-3 gives a rough picture of data block structure.
Structure
Table 5-3
0 and above
24 and above for
MD, otherwise
32
Detailed data block structures and parameterization data for the individual
types of data blocks can be found in the following sections.
5.3.1 Machine Data
DB Structure Table 5-4 gives you an overview of the structure of the "machine data" data
block (DB-MD).
DB No.: 1205 for channel 1
DB No.: 1505 for channel 2
DB No.: 1805 for channel 3
Table 5-4 DB Structure - Machine Data
Address Variable Type
0 WORD
2 WORD
4 DWORD
8 WORD
10 WORD 1
12 2 STRING MD
16 DWORD 453
20 4 CHAR 0
24 and
above...
5-10
Data Block Structure
Addresses/
Contents
Offset
DB header (36 bytes)
User data area / structure header
User data
Value Significance of the Variables
DB header (36 bytes)
Rack slot
DB No. ( 1000)
Reserved
Error No. (from FM)
Channel number
DB identifier/type
Module identifier
Version number/block number
See machine data list MD5 - MD61
Comment
System information, not rele-
vant for user
Information for labeling of data
block within the system
Parameterization data
Comment
Module address
As in DB header
With MMI services
2 ASCII characters
FM 453
(DB structure)
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01