Block Change Delay; Data Lists; Machine Data; General Machine Data - Siemens SINUMERIK 840D sl Function Manual

4.9.2

Block change delay

Even if all path axes and special axes traversing in the part program block have satisfied their
specific block transition criteria, the block change can still be delayed due to other unsatisfied
conditions and/or active functions:
Examples:
● Missing auxiliary function acknowledgement by the PLC
● Non-existent following blocks
● Active function "Empty buffer"
Effects
If a block change cannot be executed in continuous path mode, all axes programmed in this
part program block (except cross-block traversing special axes) are stopped. In this case,
contour errors do not occur.
The stopping of path axes during machining can cause undercuts on the workpiece surface.
4.10

Data lists

4.10.1

Machine data

4.10.1.1

General machine data

Number Identifier: $MN_
10110 PLC_CYCLE_TIME_AVERAGE
10680 MIN_CONTOUR_SAMPLING_TIME
10682 CONTOUR_SAMPLING_FACTOR
10712 NC_USER_CODE_CONF_NAME_TAB
12030 OVR_FACTOR_FEEDRATE
12100 OVR_FACTOR_LIMIT_BIN
18360 MM_EXT_PROG_BUFFER_SIZE
4.10.1.2

Channelspecific machine data

Number Identifier: $MC_
20150 GCODE_RESET_VALUES
20170 COMPRESS_BLOCK_PATH_LIMIT
20172 COMPRESS_VELO_TOL
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
B1: Continuous-path mode, Exact stop, Look Ahead
Description
Average PLC acknowledgment time
Minimum contour sampling time
Contour sampling factor
List of reconfigured NC commands
Evaluation of the path feed override switch
Limit for binarycoded override switch
FIFO buffer size for execution from external source
(DRAM)
Description
Initial setting of the groups
Maximum traversing length of NC block for compres‐
sion
Maximum permissible deviation from path feed for com‐
pression
4.10 Data lists
239