Adapting The Size Of The Interpolation Buffer - Siemens SINUMERIK 828D Function Manual

K1: Mode group, channel, program operation, reset response
9.13 Program control
Activation
The 10 skip levels "/0" to "/9" are activated by the PLC setting the PLC → NCK interface signals.
The function is activated from the HMI via the "Program control" menu in the "Machine" operating area:
• for skip levels "/0" to "/7":
via the interface HMI → PLC DB21, ... DBB26 (skip block selected).
• for skip levels "/8" to "/9":
via interface HMI → PLC DB21, ... DBX27.0 to DBX27.1.
References:
Operating Manual
Note
The levels to be skipped can only be changed when the control is in the STOP/RESET state.
9.13.3

Adapting the size of the interpolation buffer

MD28060
The channel­specific interpolator executes prepared blocks from the interpolation buffer during the part program
run. The maximum number of blocks requiring space in the interpolation buffer at any given point in time is
defined by the memory configuring MD28060 $MM_IPO_BUFFER_SIZE (number of NC blocks in the IPO buffer
(DRAM)). For some applications it may be meaningful not to use the full buffer capacity in order to minimize the
"interval" between preparation and interpolation.
SD42990
The number of blocks in the interpolation buffer can be restricted dynamically to a smaller value than in MD28060
$MC_MM_IPO_BUFFER_SIZE (number of NC blocks in the IPO buffer (DRAM)), minimum 2 blocks, with the
setting data SD42990 $SC_MAX_BLOCKS_IN_IPOBUFFER (max. number of blocks in the IPO buffer).
Values of setting data SD42990 $SC_MAX_BLOCKS_IN_IPOBUFFER:
Value
< 0
or 1
< < MM_IPO_BUFFER_SIZE
>= MM_IPO_BUFFER_SIZE
616
Effect
No interpolation buffer limit active.
The max. possible interpolation buffer as set in MD 28060:
MM_IPO_BUFFER_SIZE is activated.
The minimum permissible interpolation buffer with 2 blocks is activated.
The interpolation buffer is activated with no more than the maximum specified
number of blocks.
The interpolation buffer is activated with the number of blocks specified in MD
28060: MM_IPO_BUFFER_SIZE.
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions