Siemens SINUMERIK 840D sl Function Manual page 319

10089
MD number
Default value: 0.0
Change becomes effective after: POWER ON
Data type: DOUBLE
Meaning:
Special cases, errors,...
corresponds with..
10090
MD number
Default value: 3
Change becomes effective after: POWER ON
Data type: DWORD
Meaning:
Special cases, errors,...
corresponds with..
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
$MN_SAFE_PULSE_DIS_TIME_BUSFALL
Wait time pulse cancellation when the bus fails
Min. input limit: 0.0
Time after which a communication failure to the drive occurs the pulses are safely canceled.
During this time it is still possible to implement a response that is executed independently in
the drive (refer to extended stop and retract).
In the following cases, the system does not wait for this time up to pulse cancellation to expire:
● When selecting an external STOP A, a test stop
● When SBH is active or SBH is selected
● For an active SG stage or when selecting an SG stage for which immediate pulse
cancellation is parameterized in MD36961 $MA_SAFE_VELO_STOP_MODE or MD36963
$MA_SAFE_VELO_STOP_REACTION.
Note:
This value is is transferred to drive parameter p9580 using the copy function of SI-MD and
compared in a crosswise data comparison.
This general machine data is included in the axis-specific checksum calculation of the safety-
related machine data (MD36998 $MA_SAFE_ACT_CHECKSUM, MD36999
$MA_SAFE_DES_CHECKSUM).
$MN_SAFETY_SYSCLOCK_TIME_RATIO
Factor for monitoring clock cycle
Min. input limit: 1
Ratio between the monitoring and system basic clock cycle. The monitoring clock cycle is the
product of this data and MD10050 $MN_SYSCLOCK_CYCLE_TIME.
The monitoring clock cycle is checked when powering up:
● It must be an integer multiple of the position control clock cycle
● It must be < 25 ms
If these conditions are not fulfilled, the factor is rounded-off to the next possible value. The
monitoring cycle that is actually set is displayed using MD10091 $MN_INFO_SAFETY_CY‐
CLE_TIME.
Further, the value for the crosswise data comparison clock cycle that is displayed using
MD10092 $MN_INFO_CROSSCHECK_CYCLE_TIME also changes.
Note:
The monitoring clock cycle defines the response time of the monitoring functions. It should be
noted that a short monitoring clock cycle time increases the load on the CPU.
MD10050 $MN_SYSCLOCK_CYCLE_TIME
MD10091 $MN_INFO_SAFETY_CYCLE_TIME
MD10092 $MN_INFO_CROSSCHECK_CYCLE_TIME
9.1 Machine data for SINUMERIK 840D sl
Protection level: 7/2
Protection level: 7/1
Data descriptions
Max. input limit: 0.8
Unit: s
Max. input limit: 50
Unit: -
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