Siemens SINUMERIK 840D sl Function Manual page 834

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P3: Basic PLC program for SINUMERIK 840D sl

13.8 Coupling of the PLC CPU

NCK/PLC coupling on SINUMERIK 840D sl (integrated PLC)

Interface: NCK/PLC

The data exchange between NCK and PLC is organized by the basic program on the PLC

side. The status information, such as "Program running", stored by the NCK in the NCK/PLC

interface is copied to data blocks by the basic program at the beginning of the cycle (OB1) and

can then be accessed in the user program (user interface). The control signals for the NCK

(e.g. NC start) entered in the interface data block by the user are also written to the internal

DPR and transferred to the NCK at the start of the cycle.

Workpiece-program-specific auxiliary functions transferred to the PLC are first evaluated by

the basic program (interruptdriven) and then transferred to the user interface at the start of OB

1. If the relevant NC block contains auxiliary functions that require that NCK processing is

interrupted (e.g. M06 for tool change), the basic program stops the decoding of the NCK block

initially for one PLC cycle. The user can then use the "read disable" interface signal to halt the

block execution until the tool change has been completed. If, on the other hand, the relevant

NC block only contains auxiliary functions, which do not require interruption of the decoding

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

Basic Functions

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