Siemens SIMATIC FM 453, Руководство пользователя

Страница: 72 / 380

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