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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
TV
Transition is valid
TT
Transition is satisfied
TS
Transition switches
CF_IV
The CRIT_FLT entry is invalid
TNO
Indicates the user-defined transition
number
CRIT
Status of the maximum 32 LAD/FBD
elements of the transition in the
current processing cycle
CRIT_OLD
Status of the maximum 32 LAD/FBD
elements of the transition in the
previous processing cycle
CRIT_FLT
Copy of CRIT if an error occurs
"Structure arrays" Option
If you have selected the "Structure arrays" option, an array containing the
structures of the transitions is created.
Array Name
G7T
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
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
Description
BOOL
BOOL
BOOL
BOOL
INT
DWORD
DWORD
DWORD
(number of transitions) * 16
Data
Read
Write int.
Type
int.
yes
no
yes
no
yes
no
yes
no
no
no
yes
no
yes
no
yes
no
Length in Bytes
Instance DB
Read
Write Ext.
Ext.
yes
no
yes
no
yes
no
yes
no
yes
no
yes
no
yes
no
yes
no
15-9
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