Detailed Description
2.9 Program control
Mode Group, Channel, Program Operation, Reset Response (K1)
2-124 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
SD42990
Setting data SD42990 $SC_MAX_BLOCKS_IN_IPOBUFFER can be used to dynamically
limit the number of blocks in the interpolation buffer to a smaller value than that in
MD28060 $MC_MM_IPO_BUFFER_SIZE; the minimum number is 2 blocks.
Values of setting data SD42990 $SC_MAX_BLOCKS_IN_IPOBUFFER:
Value Effect
< 0 No interpolation buffer limit active.
The max. possible interpolation buffer as set in MD 28060:
MM_IPO_BUFFER_SIZE is activated.
or 1 The minimum permissible interpolation buffer with 2 blocks is activated.
< MM_IPO_BUFFER_SIZE The interpolation buffer is activated with no more than the maximum specified
number of blocks.
>= MM_IPO_BUFFER_SIZE The interpolation buffer is activated with the number of blocks specified in MD
28060: MM_IPO_BUFFER_SIZE.
Note
If SD42990 $SC_MAX_BLOCKS_IN_IPOBUFFER is set in the part program, the
interpolation buffer limitation takes effect immediately if the block with the SD is being
preprocessed by the interpreter.
This means that the limitation of the IPO buffer may take effect a few blocks before the
intended limitation (see also MD 28070 $MC_MM_NUM_BLOCKS_IN_PREP).
To avoid premature activation and to make the limitation of the IPO buffer take effect in
synchronism with the block, a STOPRE (preprocessing stop) must be programmed before
the SD is set in the part program.
Validity
SD42990 $SC_MAX_BLOCK_IN_IPOBUFFER has global, channel-specific validity and can
also be modified in a part program. This modified value is maintained at program end. If this
setting data is to be reset again on defined events, a so-called event-driven program must be
created to do this. For example, this setting data could always be set to a predefined value
on RESET.
Application
The IPO buffer limitation can be used whenever the number of blocks between block
preparation and interpolation must be minimized, e.g., when actual positions in the part
program must be read and processed for other purposes.
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