Siemens SINUMERIK 840C Installation Instructions Manual page 200

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When "Working from external" or from the hard disk, the part program is read into a circular

buffer which executes the program at the same time. The circular buffer is part of the part

program memory. The size of the circular buffer is defined in NC MD 30 as number sectors

(1 sector = 507 bytes).

If the specified sectors are not available to the circular buffer on NC Start (either occupied by

part programs or part program memory too small), the circular buffer is reduced to the

maximum possible number of sectors by the control.

Additional machine data: (MD 130*, MD 5148-5152, option bit)

If processing is to take place from more than 1 interface, an appropriate area is reserved for

each of these interfaces.

SINUMERIK 840C (IA)

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Number of Execution Memory Sectors

Default value

Lower input value

External mass

Active RS232C (V.24) or Sinec H1

Sinumerik 840C

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6 NC Machine Data (NC MD), NC Setting Data (NC SD)

Upper input value

Block pointer for reading in

Unassigned circular buffer

Block pointer for execute

Full circular buffer

6FC5197- AA50

6.2 General machine data (general data)

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