Siemens SINUMERIK 840D sl Function Manual page 368

Data descriptions
9.1 Machine data for SINUMERIK 840D sl
36949
MD number
Default value: 6 - for mm/min, inch/min
default value: 1. for rpm
Change becomes effective after: POWER ON
Data type: DOUBLE
Meaning:
corresponds with ...
Additional references
36950
MD number
Default value: 0.5
Change becomes effective after: POWER ON
Data type: DOUBLE
Meaning:
Special cases, errors,...
Additional reference
36951
MD number
Default value: 0.1
Change becomes effective after: POWER ON
Data type: DOUBLE
368
$MA_SAFE_SLIP_VELO_TOL
Speed tolerance, slip
Min. input limit: 0
min. Input limit: 0
Speed/velocity difference that, for a 2-encoder system, is tolerated between the motor and
load sides without the crosswise data comparison between the drive and NCK signaling an
error.
MD36949 $MA_SAFE_SLIP_VELO_TOL is only evaluated, if MD36901 $MA_SAFE_FUNC‐
TION_ENABLE, bit 3 is set.
/FBSIsl/ see Chapter "Actual value synchronization (slip for 2-encoder systems) (Page 96)"
$MA_SAFE_MODE_SWITCH_TIME
Tolerance time for SGE changeover
Min. input limit: 0.0
SGE changeover operations do not take effect simultaneously owing to variations in run times
(propagation times) for SGE data transfer in the two monitoring channels. A crosswise data
comparison would, in this case, output an error message.
This data is used to specify the period of time after SGE changeover operations during which
no crosswise comparison of actual values and monitoring results is carried out (machine data
is still compared!). The selected monitoring functions continue to operate unhindered in both
monitoring channels.
A safety-related function is immediately activated in a monitoring channel if selection or
changeover is detected in this channel.
The different run time (propagation time) is mainly caused by the PLC cycle time.
System-related minimum tolerance time: 2 x PLC cycle time (maximum cycle) + 1 x IPO cycle
time.
The variations in the run times in the external circuitry (e.g. relay operating times) must also
be taken into account.
/FBSIsl/ see Chapter "Safety-related input/output signals (Page 171)"
$MA_SAFE_VELO_SWITCH_DELAY
Delay time, speed changeover
Min. input limit: 0.0
Protection level: 7/2
Protection level: 7/2
Protection level: 7/2
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Max. input limit: 1000
max. Input limit: 1000.
Unit: mm, inches, degrees
Max. input limit: 10
Unit: s
Max. input limit: 600.
Unit: s
Safety Integrated