Siemens Sinumerik 840D sl Function Manual page 534

Data Description
8.7 System variables
Table 8-9 Overview of system variables, continued
Miscellaneous
$A_STATSID Crosswise data comparison error
triggered if the value is not equal
to 0
$A_CMDSI Control word for crosswise data
comparison between the NCK
and PLC (SPL- -CDC)
$A_LEVELSID CDC stack level display: Number
of signals for which NCK and PLC
detect different signal levels
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Bit 0...5=1: INT
CDC error in
I/O signals,
markers or dy-
namic data of
the SENDDP/
RECVDP com-
munication
Bit26=1: PRO-
FIsafe commu-
nication error
occurred
Bit27=1: CDC
error in static
data
Bit 28=1: Cross-
wise data com-
parison error
"SPL protection
status" (status
$MN_PRE-
VENT_SYN-
ACT_LOCK not
equal to DB18
DBX36.0 /SPL
READY))
Bit 29=1: Time
error in the
communications
between NCK
and PLC (in 5 s,
all ext. NCK- -
SPL outputs are
set to 0, the
PLC goes to
stop)
n = 1: Increase BOOL
the time for the
signal change
monitoring to
10 s
[0, MAX_INT] INT
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