Siemens SINUMERIK 840D Description Of Functions page 262

4 Data Descriptions
4.3 Interface signals
Fig. 4-2
Application Only when the spindle has stopped (SGA "n < n
example, controlled.
The limit speed n
Defining limit speed n
x
For 840D
For 611 digital
Description of the The SGAs "SG active bit 1, 0" display which safely reduced speed and
SGAs therefore which speed limit value is actively monitored. The SGAs are only
"SG active bit 1, 0" updated when the function "SBH/SG" is enabled and SG is active (SGE
"SBH/SG de-selection" = 0 and "SBH de-selection" = 1).
(840D from SW 4.2)
Table 4-7
4-262
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
n
n
x
1
SGA "n < n "
x
0
Signal n < n
is defined using the following machine data:
x
MD 36946: $MA_SAFE_VELO_X
MD 1346: $MD_SAFE_VELO_X
Note
If the axis/spindle runs at n
x,
channels of the SGA can cause the SGA "n < n
This must be taken into account in the safe further processing of the SGA.
Display of the active safely-reduced speed
SGA
SG SG SBH/
active active SG
Bit 1 Bit 0 active
= 0 = 0 1
= 0 = 0 1
= 0 = 1 1
= 1 = 0 1
= 1 =1 1
= 0 = 0 0
Note:
State "SG active Bit 1, 0" = "0" has two different meanings. An unambiguous
interpretation can be obtained by additionally evaluating the SGAs "SBH active" and
"SBH/SG active".
, depending on the speed characteristic
x
" = 0) is the chuck, for
x
changes in the actual value in both monitoring
" to have different states.
x
SBH Meaning
active
1 SBH is active (no safely-reduced speed active)
0 Speed limit value for SG1 active
0 Speed limit value for SG2 active
0 Speed limit value for SG3 active
0 Speed limit value for SG4 active
0 Neither SBH nor SG is active
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11.03
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