Safety-Related Output "N<Nx - Siemens SINUMERIK 840D sl Function Manual

05.08
6.6 Safety–related output "n<n
The function safety–related output "n<nx" (SGA "n<n
speed range of a drive. The speed range detection is evaluated on a user–for–user
basis, e.g. in so much that a protective door can only be re–enabled if a spindle
that is running–down has fallen below a certain speed.
SGA "n < n
Fig. 6-14
Description
This function is for each axis and is implemented through 2 channels. One channel
is activated in the NCK, the other directly in the drive.
One velocity comparison value n
If the actual speed n of the drive falls below the velocity comparison value n
an associated SGA "n<n
By further processing the SGAs "n<n
– then, for example it can be evaluated as to whether a drive is in a non–hazard-
ous speed range.
Defining n
x
The limit speed n
for 840D sl:
MD 36946 $MA_SAFE_VELO_X
for SINAMICS S120:
p9546 SI motion SSM (SGA n < nx) speed limit n_x (CU)
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
n
n
x
1
"
x
0
Signal n < n , dependent on the speed characteristic
x
x
" switches. Contrary to SG, no other response is initiated.
x
is defined using the following MD/following parameters:
x
Safety Functions Integrated in the System/Drive
6.6 Safety–related output "n<nx"
"
x
") is used to safely detect the
x
can be defined in the machine data.
" – e.g. using safe programmable logic (SPL)
x
t
, then
x
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