4 Data Descriptions
11.03
4.1 Machine data
© Siemens AG 2003 All Rights Reserved
4-220
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
36926
MD number
$MA_SAFE_ENC_FREQ_LIMIT
Encoder frequency for safe operation
840D
Default: 300000
Min. input value: 300000
Max. input value: 420000
Change becomes effective after POWER ON:
Protection level (R/W) 7/2
Unit: freq.
Data type: DWORD
Applies from SW 6.3
Meaning
Encoder frequency above which amplitude monitoring is disabled. A speed corresponding
to this frequency may not be exceeded in safe operation. If the encoder frequency is
exceeded in safe operation (SBH or SG), the stop response parameterized for the active
monitoring function is triggered.
For Performance-2 control modules, High Standard and High Performance, this frequency
can be set higher than 300 kHz.
Parameterization errors are flagged with Alarm 27033.
36930
MD number
$MA_SAFE_STANDSTILL_TOL
Standstill tolerance
840D
Default: 1 mm
Min. input value: 0
Max. input value: 100
Change becomes effective after POWER ON:
Protection level (R/W) 7/2
Unit: mm, inches, degrees
Data type: DOUBLE
Applies from SW 3.4
Meaning
The tolerance for the safe operating stop is set in this data.
If the difference between the position reference value and position actual value is greater
than the tolerance set here when safe operating stop is selected, then the control system
activates Alarm 27010 with STOP A or B.
Corresponds with …
MD 36956: $MA_SAFE_PULSE_DISABLE_DELAY
36931
MD number
$MA_SAFE_VELO_LIMIT[n]
Limit value for safely-reduced speed
840D
Default: 2 000 mm/min
Min. input value: 0
Max. input value: *
Change becomes effective after POWER ON:
Protection level (R/W) 7/2
Unit: mm/min
inch/min, rev./min
Data type: DOUBLE
Applies from SW 3.4
Meaning
The limit values for safely-reduced speeds 1, 2, 3 and 4 are set in this data.
When SG1, SG2, SG3 or SG4 is selected and the current speed exceeds the limit set
here, then the control system activates Alarm 27011 with the stop response configured in
$MA_SAFE_VELO_STOP_MODE.
n = 0, 1, 2, 3 stand for limit value of SG1, SG2, SG3, SG4
Special cases, errors
With active SBH/SG and a 1-encoder system, the speed is monitored on the basis of an
encoder limit frequency of 200kHz (300 kHz from SW 4.2). An appropriate alarm is output
when the limit is exceeded.
Corresponds with …
MD 36961: $MA_SAFE_VELO_STOP_MODE
36932
MD number
$MA_SAFE_VELO_OVR_FACTOR[n]
Override factor for SG
840D
Default: 100
Min. input value: 1
Max. input value: 100
Change becomes effective after POWER ON:
Protection level (R/W) 7/2
Unit: %
Data type: DWORD
Applies from SW 4.2
Meaning
Using SGEs it is possible to select overrides for safely-reduced speeds 2 and 4 and to set
the associated override value (percentage) in this machine data.
n = 0, 1, ... , 15 stand for overrides 0, 1, ... 15
Application $MA_SAFE_VELO_OVR_FACTOR[0]=30
(Override
0)
$MA_SAFE_VELO_OVR_FACTOR[1]=50 (Override
1)
$MA_SAFE_VELO_OVR_FACTOR[2]=80 (Override
2)
$MA_SAFE_VELO_OVR_FACTOR[3]=100 (Override
3)
Depending on whether override 0, 1, 2 or 3 is selected, safely-reduced speeds 2 and 4
are monitored for 30, 50, 80 or 100% of the set limit value.
Special cases, errors
•
The "Override for safely-reduced speed" function is enabled via MD 36901
(MD 1301):
•
This override is not applied to the limit values for safely-reduced speeds 1 and 3.
Corresponds with …
MD 36978: $MA_SAFE_OVR_INPUT
[
n
]
MD 36931: $MA_SAFE_VELO_LIMIT
[
n
]
References
Refer to Chapter 3, "Override for safely-reduced speed"
