Siemens SINUMERIK 840D sl Function Manual page 350

Data descriptions
9.1 Machine data for SINUMERIK 840D sl
20700
MD number
Default value TRUE
Change becomes effective after: RESET
Data type: BOOLEAN
Meaning:
corresponds with ...
Additional reference
28251
MD number
Default value: 0
Change becomes effective after: POWER ON
Data type: DWORD
Meaning:
corresponds with ...
Additional reference
36901
MD number
Default value: 0H
Change becomes effective after: POWER ON
Data type: DWORD
350
$MC_REFP_NC_START_LOCK
NC start inhibit without reference point
Min. input limit: -
0:
The NC/PLC interface signal (NC start) to start part programs or part program blocks (MDA
and save/overwrite) is effective, even if one or all axes of the channel has/have still not been
referenced. In order that the axes still reach the correct position after the NC start, the work‐
piece coordinate system (WCS) must be set to a correct value using other methods (scratch‐
ing, automatic work offset determination, etc.).
1:
Those axes, that were specified (in the application) as requiring to be referenced in the axis-
specific MD20700 $MA_REFP_CYCLE_NR (value > -1), must be referenced before an NC
start is permitted.
$MC_MM_NUM_SAFE_SYNC_ELEMENTS
Number of elements for expressions in safety synchronized actions
Min. input limit: 0
The expressions of motion synchronized actions are saved in storage elements in the control
system. A motion synchronizing action requires a minimum of 4 elements.
The assignments are as follows:
each operand in the condition: 1 element
each action: >= 1 element
each assignment: 2 elements
each additional operand in complex expressions: 1 element
See also: MD28250 $MC_MM_NUM_SYNC_ELEMENTS
$MA_SAFE_FUNCTION_ENABLE
Enables safety-related functions
Min. input limit: 0H
Protection level: 7/2
Protection level: 7/2
Protection level: 7/2
Max. input limit: 0x81FFFB
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Max. input limit: -
Unit: -
Max. input limit: 32000
Unit: -
Unit: -
Safety Integrated