Siemens SIMATIC S7-GRAPH, Manual

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Instance DB
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
15-11
15.11 The Step Structure
A structure with the following components is created in the instance DB for every
step of the sequencer in the S7-Graph FB, as follows:
Component Description Data
Type
Read
int.
Write int. Read
Ext.
Write Ext.
S1 Step is activated BOOL yes no yes no
L1 Interlock leaving state BOOL yes no yes no
V1 Supervision entering state BOOL yes no yes no
R1 Reserved BOOL no no no no
A1 Error is acknowledged BOOL yes no yes no
S0 Step is deactivated BOOL yes no yes no
L0 Interlock entering state BOOL yes no yes no
V0 Supervision leaving state BOOL yes no yes no
X Step is active BOOL yes no yes no
LA Interlock is not satisfied BOOL yes no yes no
VA Supervision active BOOL yes no yes no
RA Reserved BOOL no no no no
AA Reserved BOOL no no no no
SS System-internal BOOL no no no no
LS Direct result of the programmed
interlock BOOL yes no yes no
VS Direct result of the programmed
supervision BOOL yes no yes no
SNO User Step Number INT no no yes no
T Total step activation time TIME yes no yes no
U Step activation time without
disturbance TIME yes no yes no
CRIT_LOC Status of the maximum 32 LAD/FBD
elements in the interlock in the
current processing cycle DWORD yes no yes no
CRIT_LOC_
ERR Copy of CRIT_LOC when the
interlock leaves the state DWORD yes no yes no
CRIT_SUP Status of the maximum 32 LAD/FBD
elements in the supervision in the
current processing cycle. DWORD yes no yes no