Setting The Nc-Plc Interface; Commencing Start-Up - Siemens SINUMERIK 840D Function Manual

9.8.2

Setting the NC-PLC interface

Introduction
An automatic synchronization process when referencing axes must be disabled initially to
prevent damaging/destroying grouping axes that are misaligned.
Disabling of automatic synchronization
The PLC user program sets the following for the axis data block of axis 1:
DB31, ... DBX29.4 = 0 (do not start gantry synchronization)
DB31, ... DBX29.5 = 1 (no automatic synchronization process)
The NC sets the following as a confirmation in the axis block of axis 1:
DB31, ... DBB101.4 = 0 (synchronization process not ready to start)
DB31, ... DBB101.6 = 1 (leading axis LA)
DB31, ... DBB101.7 = 1 (gantry axis)
The PLC user program sets for the axis data block of axis 3:
DB31, ... DBX29.4 = 0 (do not start gantry synchronization)
The NC sets the following as a confirmation in the axis block of axis 3:
DB31, ... DBB101.4 = 0 (synchronization process not ready to start)
DB31, ... DBB101.6 = 0 (synchronized axis GA)
DB31, ... DBB101.7 = 1 (gantry axis)
9.8.3

Commencing start-up

Referencing
The following steps must be taken:
● Select "REF" operating mode
● Start referencing for axis 1 (master axis)
● Wait until message "10654 Channel 1 Waiting for synchronization start" appears.
At this point in time, the NC has prepared axis 1 for synchronization and registers this at the
interface signal:
DB31 DB31, ... DBB101.4 = 1 (synchronization process ready to start)
DB31, ... DBB101.6 = 1 (leading axis LA)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
G1: Gantry axes
9.8 Examples
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