Siemens SINUMERIK 840Di Function Manual page 662

Detailed Description
2.9 Program control
With modulo axes, the programmed value, which may be outside the modulo range, is
displayed in the basic block display.
Configure basic block display
The basic block display can be configured via the following machine data:
NCK machine data for basic block display
MD28400 $MC_MM_ABSBLOCK
MD28402
$MC_MM_ABSBLOCK_BUFFER_CONF[2]
Display of machine data
MD9004 $MM_DISPLAY_RESOLUTION
MD9011 $MM_DISPLAY_RESOLUTION_INCH
MD9010 $MM_SPIND_DISPLAY_RESOLUTION
MD9424 $MM_MA_COORDINATE_SYSTEM
These display machine data are copied to NCK machine data
MD17200 $MN_GMMC_INFO_UNIT[0] to MD17200 $MN_GMMC_INFO_UNIT[3] allowing
them to be accessed from the NCK.
Activation
The basic block display is activated by MD 28400 $MC_MM_ABSBLOCK by means of
Power On. If MD28400 $MC_MM_ABSBLOCK is set to 1, a channelspecific display buffer
(FIFO) is created during power-up.
Size of display buffer (FIFO) = (MD28060 $MC_MM_IPO_BUFFER_SIZE + MD28070
$MC_MM_NUM_BLOCKS_IN_PREP) multiplied by 128 bytes. This corresponds to a size of
6KB in the machine data default setting.
Optimizing the size of the display buffer
The memory requirement can be optimized by entering a value between 128 and 512. The
display blocks preprocessed in the display buffer are transferred to the HMI via a
configurable upload buffer.
Maximum size of upload buffer is obtained by multiplying
(MD28402 $MC_MM_ABSBLOCK_BUFFER_CONF[0] +
MD28402 $MC_MM_ABSBLOCK_BUFFER_CONF[1] + 1) by the block length configured in
MD28400 $MC_MM_ABSBLOCK.
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Note
As a basic rule the positions are represented in the WCS or the SZS.
The basic block display can be activated or deactivated with setting data
SD42750 $SC_ABSBLOCK_ENABLE.
Meaning:
Activate basic block display
Size of display buffer
Position values to be set:
For metric measurements
For inch measurements
Settable coordinate system for spindle display
resolution
For actual value display in WCS or SZS
Mode Group, Channel, Program Operation, Reset Response (K1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0