Siemens SIMATIC S7-GRAPH - Internal Data Area

Instance DB
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
15-19
Name Description Data
Type
Read
int.
Write Int. Read
Ext.
Write Ext.
TV_OFL Too many valid
transitions
BOOL yes no yes no
MSG_OFL Too many messages BOOL yes no yes no
NO_SWI Reserved BOOL no no no no
CYC_OP System-internal BOOL no no no no
AS_MSG System-internal BOOL no no no no
AS_SEND System-internal BOOL no no no no
SQ_BUSY System-internal BOOL no no no no
SA_BUSY System-internal BOOL no no no no
AS_SIG System-internal BOOL no no no no
The component with group bits is saved in the instance DB as follows:
Structure Name Type Description Length in
Bytes
SQ_FLAGS t_sq_flags Group bits 2
15.13 Internal Data Area
This part of the instance DB is a system-internal area. These data should not be
accessed.The data area is divided into 4 sections:
Internal Working Area 1
Description Data Length
Internal Working Area 1 variable variable