Siemens SINUMERIK 840D sl Function Manual page 287

System variable Meaning
$A_STATSID A value not equal to 0
means that an error has
occurred in the cross‐
wise data comparison.
$A_CMDSI Control word for cross‐
wise data comparison
between the NCK and
PLC (SPL-CDC)
$A_LEVELSID CDC level display:
Number of signals for
which NCK and PLC de‐
tect different signal lev‐
els
$A_PLCSIIN[n] Single-channel commu‐
nication between NCK
and PLC SPL
$A_PLCSIOUT[n] Single-channel commu‐
nication between NCK
and PLC SPL
$AC_SAFE_SYNA_ Free safety synchroniz‐
MEM ing elements
$VA_SAFE_TYPE[a Information about the ac‐
xis] tive safety operating
mode of this axis
Note: r = read, w = write
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Value range Data type
Bit 0...5=1: CDC INT
error in I/O sig‐
nals, markers or
dynamic data of
the FSENDDP/
FRECVDP com‐
munication
Bit 26=1: Error
has occurred in
PROFIsafe com‐
munication
Bit 27=1: CDC er‐
ror in static data
Bit 28=1: CDC er‐
ror "SPL protec‐
tion status"
Bit 29=1: Time er‐
ror in the commu‐
nication between
NCK and SPL
Bit 30=1: PLC sig‐
nals a stop to the
NCK
n = 1: Increase the BOOL
time for the signal
change monitor‐
ing to 10 s
0...320 INT
1, 2, ... 96 BOOL
1, 2, ... 96 BOOL
[0, MAX_INT]
[0,2] INT
Connecting sensors and actuators
8.5 Safe programmable logic
Possible access for
x x
x x x
x x
x x
x x x
x x
x x
x
x
287