11.03
4 Data Descriptions
4.2 Machine data for SIMODRIVE 611 digital
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
4-247
If the difference between the position actual values is greater than the tolerance
window, the drive initiates an alarm (STOP F) and shuts down if at least one
monitoring function is active.
1344
$MD_SAFE_REFP_POS_TOL
611 digital
Actual value tolerance safe axis position
Relevant for:
FD/MSD
Unit:
µm or
mdegrees
Default:
10
Minimum value:
0
Maximum value:
36 000
Data type:
long integer
Becomes
effective:
POWER ON
Tolerance threshold for the actual value monitoring after referencing. A second
absolute actual position is calculated from the last standstill position that is
saved before the encoder is powered down and the distance traversed since
POWER ON. These two actual positions must be within the tolerance window
or else the axis cannot be referenced without a "user agreement". If the user
agreement is not present, alarm "axis not safely referenced" is output with error
code.
The following factors must be taken into consideration when calculating
tolerance values:
Backlash, leadscrew errors, temperature errors, torsion for 2-encoder systems,
gear play for selector gearboxes, lower resolution for 2-encoder systems,
oscillating travel for selector gearboxes.
1346
$MD_SAFE_VELO_X
611 digital
Speed limit nx
Relevant for:
FD/MSD
Valid from:
SW4.2 for 840D
Unit:
mm/min, rpm
Default:
20
Minimum value:
0
Maximum value:
1 000
Data type:
float
Becomes
effective:
POWER ON
This data defines the speed limit n
x
for SGA "n < n
x
".
Setting 0 means: n < n
x
is not active.
1348
$MD_SAFE_STOP_VELO_TOL
611 digital
Actual speed tolerance for SBR
Relevant for:
FD/MSD
Valid from:
SW4.2 for 840D
Unit:
mm/min,
inch/min, rpm
Default:
300
Minimum value:
0
Maximum value:
20 000
Data type:
float
Becomes
effective:
POWER ON
After activating the safe braking ramp (SBR), the actual speed plus the speed
tolerance, specified using this machine data, is activated as speed limit. If a
value > 0 is specified in this MD, a value, converted to the internal format, is
limited to >= 1.
Recommended settings: Refer to Chapter 3 "Safe braking ramp"
1349
$MD_SAFE__SLIP_VELO_TOL
611 digital
Tolerance 2-encoder drift / slip
Relevant for:
FD/MSD
Valid from:
SW5.2 for 840D
Unit:
mm/min,
inch/min, rpm
Default:
6
Minimum value:
0
Maximum value:
1000
Data type:
float
Becomes
effective:
POWER ON
The tolerance specified in this MD is used as the maximum permissible speed
difference between the NC and drive if the function in bit 3 of MD 1301 "Enable
actual value synchronization" is selected. The tolerance in this MD is then used
for the crosswise data comparison instead of the parameterized tolerance in
