Siemens SINUMERIK 840D Description Of Functions page 223

11.03
36944 $MA_SAFE_REFP_POS_TOL
MD number Actual value comparison tolerance (referencing)
Default: 0.01 mm
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning The tolerance for the actual value check after referencing (with an incremental encoder)
or at POWER ON (with an absolute encoder) is set in this data.
A second absolute actual position is calculated from the last standstill position that was
saved prior to control power off and the distance traversed since POWER ON. The control
system checks the actual values after referencing on the basis of the two actual positions,
the traversed distance and this data.
The following factors must be taken into consideration when calculating tolerance values:
Backlash, leadscrew errors, compensation (max. compensation values for LEC, sag and
temperature compensation), temperature errors, torsion (2-encoder system), gear play for
selector gearboxes, lower resolution (2-encoder system), oscillating distance for selector
gearboxes.
Special cases, errors If these two actual positions deviate from one another by more than the value set in this
data with valid user agreement, then Alarm 27001 is displayed with error code 1003 and a
new user agreement is required for referencing.
36946 $MA_SAFE_VELO_X
MD number Speed limit n
Default: 20.0
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning This data defines limit speed n
Corresponds with ... MD 1346: $MD_SAFE_VELO_X
References Refer to Chapter 3, "SGA "n < n
36948 $MA_SAFE_STOP_VELO_TOL
MD number Actual speed tolerance for SBR
Default: 300.0
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning After the safe braking ramp has been activated, the actual speed plus the speed tolerance
set in this machine data are applied as a speed limit.
Corresponds with ... MD 1348: $MD_SAFE_STOP_VELO_TOL
References Refer to Chapter 2, "Safe braking ramp (SBR)"
(a recommended setting and setting formula are specified in this Chapter).
36949 $MA_SAFE_SLIP_VELO_TOL
MD number Speed tolerance slip
Default: 6.0
Change becomes effective after POWER ON:
Data type: DOUBLE
Meaning Speed difference that, for a 2–encoder system is tolerated between the drive and and
load sides without the crosswise data comparison between SIMODRIVE 611digital and
NCK signaling an error.
MD 36949 is only evaluated if MD $MA_SAFE_FUNCTION_ENABLE, bit 3 is set.
Corresponds with ... MD 1349: $MD_SAFE_SLIP_VELO_TOL
References Refer to Chapter 3.11.4, Actual value synchronization
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Min. input value: 0
Protection level (R/W) 7/2
Applies from SW 3.4
x
Min. input value: 0.0
Protection level (R/W) 7/2
Applies from SW 4.2
for SGA "n < n
x
" and "SG active""
x
Min. input value: 0.0
Protection level (R/W) 7/2
Applies from SW 4.2
Min. input value: 0.0
Protection level (R/W) 7/2
Applies from SW 5.2
4 Data Descriptions
4.1 Machine data
Max. input value:
1 mm or 36 degrees
Unit: mm, inches, degrees
Max. input value: 1 000.0
Unit: mm/min
inch/min, rev./min
".
x
Max. input value: 20 000.0
Unit: mm/min
inch/min, rev./min
Max. input value: 1000.0
Unit: mm/min
inch/min, rev./min
840D
840D
840D
840D
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