Siemens SINUMERIK 840D sl Function Manual page 382

Data Description
8.4 System variables
Table 8-11
Variable
$VA_IS
$AA_IM
References:
System variables $A_XFAULTSI and $VA_XFAULTSI
For crosswise data comparison errors between the NCK and SINAMICS S120, the
response depends on the actual operating state:
S SBH, SG, SE or SN active: A crosswise data comparison error causes a transi-
tion from Stop F to Stop B – which in turn initiates the fastest possible braking
of the axis. A Stop A is then initiated and the pulse enable is cancelled.
S SBH and SG are not active and SE/SN is not used or Stop C/D/E has already
been activated: In this case, a Stop F due to a crosswise data comparison error
does not result in any further action – only Alarm 27001 is output that provides
information. Processing then continues.
This chain of responses is not altered to ensure the appropriate level of safety for
personnel.
To allow responses to a crosswise data comparison error, system variable
$A_XFAULTSI is used to display that a crosswise data comparison error has oc-
curred on a particular SI axis. Retraction can then be initiated as a response to this
system variable.
Further, an axis–specific system variable $VA_XFAULTSI[<axis name>] has been
introduced so that, if necessary, axis–specific responses can be applied.
The system variables are updated independent of whether SI monitoring functions
are active or inactive.
$A_XFAULTSI
Information about Stop F for a safety axis:
Bit 0 = 1:
Bit 1 = 1:
8-382
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Difference between $VA_IS and $AA_IM
Reading the actual value used by SI
Reading the actual value used by the closed–loop control (setpoint for the
closed–loop position control)
/PGA/, Programming Manual Job Planning
In a crosswise data comparison between NCK and drive of any par-
ticular safety axis, an actual value error was detected.
In the crosswise data comparison between NCK and drive of any
axis, an error was detected and the delay time until Stop B is initi-
ated for this axis is either running or has already expired.
($MA_SAFE_STOP_SWITCH_TIME_F)
Description
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05.08