Description Of The System Variables - Siemens Sinumerik 840D sl Function Manual

Data Description
8.7 System variables
Table 8-9 Overview of system variables, continued
$VA_SAFE_TYPE[ Information about the active
axis] safety operating mode of this axis
Note:
r - - > read, w - -> write
An implicit preliminary stop is generated
only permitted in the commissioning phase
1)
The number of these system variables depends on the option SI Basic, SI Comfort or SI High- -Feature.
SI Basic 4I/4O
SI Comfort 64I/64O
SI High- -Feature 192I/192O
8.7.2

Description of the system variables

System variable $VA_IS
The safe actual value, used by SI, can be read and further processed by the NC
part program for every axis/spindle.
Example:
When an NC part program is started, Safety Integrated checks whether axis X
would move into the vicinity of shutdown limits as a result of the zero offsets when
a program is processed. The part program can be programmed as follows, for
example:
IF ($VA_IS[X] < 10000) GOTOF POS_OK
MESG ("Axis has nearly reached limit switch!") ;
POS_OK:
...
The variable can also be used in synchronous actions in order to reduce the
override when the axis is nearly at the limit switch.
8-536
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
[0, 1, 2] INT
; if the actual value is too high,
then message,
; otherwise, continue here
© Siemens AG 2015 All Rights Reserved
10/15
r w r w
x x