Instance DB
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
15-9
15.10 The Transition Structure
A structure with the following parameters is created in the instance DB for every
transition located in the sequencer of the S7-Graph FB:
Component Description Data
Type
Read
int.
Write int. Read
Ext.
Write Ext.
TV Transition is valid BOOL yes no yes no
TT Transition is satisfied BOOL yes no yes no
TS Transition switches BOOL yes no yes no
CF_IV The CRIT_FLT entry is invalid BOOL yes no yes no
TNO Indicates the user-defined transition
number
INT no no yes no
CRIT Status of the maximum 32 LAD/FBD
elements of the transition in the
current processing cycle
DWORD yes no yes no
CRIT_OLD Status of the maximum 32 LAD/FBD
elements of the transition in the
previous processing cycle
DWORD yes no yes no
CRIT_FLT Copy of CRIT if an error occurs DWORD yes no yes no
"Structure arrays" Option
If you have selected the "Structure arrays" option, an array containing the
structures of the transitions is created.
Array Name Length in Bytes
G7T (number of transitions) * 16
Internal access uses the transition number followed by the name of the structure
element.
This means that the following access is possible in conditions or actions:
• T003.TT
• T017.CRIT
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