Siemens SINUMERIK 840D sl Function Manual page 196

Connecting Sensors/Actuators
7.1 Safety–related input/output signals
Example
It must be possible to change over between the "safe software limit switches" 1 or
2 for axes 1, 2 and 3 as a group using an internal NCK–SPL output (OUTSI x).
The machine data must be parameterized as follows:
Axis 1: MD 36973: $MA_SAFE_POS_SELECT_INPUT = OUTSI x
Axis 2: MD 36973: $MA_SAFE_POS_SELECT_INPUT = OUTSI x
Axis 3: MD 36973: $MA_SAFE_POS_SELECT_INPUT = OUTSI x
Processing the NCK–SGA for 840D sl (multiple assignment)
Axis–specific/spindle–specific machine data is used to define which SGA from
which axis/spindle must be assigned to which NCK–SPL input. It is possible to im-
plement a multiple assignment (SGA from several axes are assigned to 1 input)
provided that certain axes/spindles belong to the same safety group. The SGA are
then ANDed and the result output at the NCK–SPL input. In addition, when an
NCK output is selected via an MD, it is also possible to define whether the signal is
to be output in an inverted form before it is ANDed.
NCK–SPL
INSI
Input 1
Input 2
Input x
...
...
...
...
...
Input n
Fig. 7-9
7-196
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Multiple
assignment
&
Multiple assignment for NCK–SGA
NCK
Inversion
SGE/SGA
interface
...
...
...
SGA
Yes/no
... ...
... ...
Yes/no
SGA ...
... ...
...
...
...
SGA
Yes/no
...
... ...
© Siemens AG 2008 All Rights Reserved
05.08
Monitoring
comparators
for axis 1
for axis 2
for axis 3