Siemens SINUMERIK 828D Function Manual page 617

Hide thumbs Also See for SINUMERIK 828D:

Table of Contents

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 RESET.

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, 09/2011, 6FC5397-0BP40-2BA0

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

Limitation of IPO buffer to 5 NC

Cancellation of the IPO buffer

9.13 Program control

Sinumerik 840d sl