Siemens SINUMERIK 840D sl Function Manual page 591

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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.

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

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.

N100 $SC_MAX_BLOCKS_IN_IPOBUFFER = 5

............

N200 $SC_MAX_BLOCKS_IN_IPOBUFFER = -1

............

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

K1: Mode group, channel, program operation, reset response

9.14 Program control

Limitation of IPO buffer to 5 NC

Cancellation of the IPO buffer

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