5 PLC Interface 04.96
5.1.2 Data blocks (DB)
5.1.2 Data blocks
(DB)
Data blocks of class DB
Data blocks DB 1 to DB 149 are reserved for Siemens applications.
Data blocks DB 150 to DB 255 can be used by the user.
DB No. DB designation DB name
Pack-
age
1 *
2 *
3 *
4 *
10 *
11 *
12 *
13 *
14
4)
15
4)
28
29
30 *
31 *
32 *
33
34
35
36 *
37 *
38
39
40 *
41 *
48 *
49
.
.
.
57
58 *
59
60 *
61 *
62 *
DIAG-DB
STATUS-DB
DATKAN-DB
FM/BM-DB
NS KN 1
NS KN 2
NS KN 3
NS KN 4
NS KN 5
NS KN 6
SI
NS ELG
DEC MFU
SPI SIG
ACHS SIG
E-PU
A-PU
DUE NC
SER SCH.
CL:ZW-DB
NS BEDT.
NS KK
NS COM
MELD
DB-ZENTRAL
MDG WO
MDF WO
MDA WO
Diagnostic DB for
PLC status channel
2
)
PLC data channel
2
)
Error and operational messages
Interface NC channel 1
Interface NC channel 2
Interface NC channel 3
Interface NC channel 4
Interface NC channel 5
Interface NC channel 6
Safety Integrated (SW 5 and higher)
ELG signals and 611D signals
Decoded M functions (list)
Interface for spindle-specific signals
Interface for axis-specific signals
Reserved
Input buffer, computer link
Output buffer, computer link
Interface for data transfer NC
<-> PLC
Interface for serial interface
3
)
Status DB computer link
Interface operator panel
Interface command channel
Interface to communication area NC/PLC
Reserved
.
.
.
Reserved
Interface for general messages
Central DB in link RAM No significance for 840
MD words basic program
MD words function blocks
MD words user
OS
OS
OS
OS
OS
OS
OS
OS
OS
OS
OS
OS
OS
OS
CL
CL
OS
OS
CL
OS
OS
OS
OS
.
.
.
OS
OS
OS
OS
OS
OS
Abbreviations:
OS Operating system
CL Computer link
Note:
The data blocks marked with an * are set up and initialized after
overall reset on cold restart by the PLC operating system. These
blocks are always initialized anew on each cold restart.
_______
2) Up to SW 2; with SW 4 and higher used for Fast Data Channel function
3) SW 3 and higher; control for data transfer
3) SW 4 and higher
5–2 © Siemens AG 1992 All Rights Reserved 6FC5197- AA60
SINUMERIK 840C (IA)
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