Siemens SINUMERIK Series Function Manual page 55

Extended functions

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Data exchange

The data exchange with the PROFIBUS I/O is performed via an NCK-internal PROFIBUS-

communication interface. The following options of data exchange with the PROFIBUS I/O

are available to the NCK user:

● Reading/writing of NCK system variables ($A_DPx_IN[n,m] or $A_DPx_OUT[n,m]) via

● Read in / output of the data blocks via the compile-cycle interface (data consistency for

Parallel data access

A parallel read access through compile cycles and part programs / synchronized actions on

data of the same I/O range is possible, as long as the corresponding I/O range has been

configured for this. One must ensure that the read accesses have access to the different

mappings of the PROFIBUS I/O data. The data consistency within these mappings is

ensured. However, the data equality between these mappings cannot be ensured during an

A parallel write access through compile cycles and part programs / synchronized actions on

data of the same I/O range is not possible. While configuring the NCK it must be determined,

whether a specific I/O range of the PROFIBUS I/O is allocated to the system variables or to

the compile cycles.

The function is activated during the NCK run-up.

Extended Functions

Function Manual, 03/2013, 6FC5397-1BP40-3BA1

part programs / synchronized actions in the IPO cycle (data consistency). The

PROFIBUS I/O data to be written is output at the PROFIBUS I/O only after the

corresponding IPO cycle.

See "Communication via part programs/synchronous actions (Page 58)".

servo cycle).

See "Communication via compile cycles (Page 61)".

A4: Digital and analog NCK I/Os for SINUMERIK 840D sl

1.3 Access via PROFIBUS

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