Siemens SINUMERIK 840D sl Function Manual page 283

For a detailed description of the system variables, also see Chapter "Description of the system
variables (Page 511)".
Table 8-5 Overview of system variables
System variable Meaning
Actual position
$VA_IS[axis] Safe actual position
NCK monitoring channel
$AA_IM[axis] Actual MCS setpoint of
an axis
$VA_IM[axis] Encoder actual value in
the machine coordinate
system
Error status
$A_XFAULTSI In the crosswise data
comparison between
NCK and drive of any ax‐
is, an actual-value error
has been detected
$VA_XFAULTSI[ax‐ The crosswise data com‐
is name] parison for this axis be‐
tween NCK and drive
has detected an actual
value error
$VA_STOPSI Actual Safety Integrated
STOP of the particular
axis
$A_STOPESI Actual Safety Integrated
STOP E for any axis
Internal SPL inputs/outputs
$A_INSI[n] NCK input
$A_INSID[n] NCK inputs
$A_INSIP[n] Image, PLC input
$A_INSIPD[n] Image of the PLC inputs n = 1, 2, ... 6
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Value range Data type
DOUBLE
DOUBLE
DOUBLE
INT
INT
INT
INT
n = 1, 2, ... 192 BOOL
stands for the
number of the in‐
put
n = 1, 2, ... 6 INT
stands for the
number of the dou‐
ble word (32 bit)
n = 1,2, ... 192 BOOL
stand for the No.
of the input
INT
stands for the
number of the dou‐
ble word (32 bit)
Connecting sensors and actuators
8.5 Safe programmable logic
Possible access for
Part program Synchronized action
r w r
x x
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w
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