Axis Permanently Assigned To The Plc - Siemens SINUMERIK Series Function Manual

K5: Mode groups, channels, axis interchange
5.4 Axis/spindle replacement
5.4.13

Axis permanently assigned to the PLC

Function
After the control has booted, the axis is in the "neutral axis" state and is controlled from the
NC channel. To traverse the axis as competing positioning axis (from the PLC via function
block FC18), the axis does not have to be explicitly requested from the PLC. Axis
interchange to the PLC is realized automatically using the traversing request via FC18. After
the traversing motion requested via FC18 has been completed, the axis again automatically
changes into the "neutral axis" state.
After the axis has been interchanged, and after the request from the PLC, the axis can also
be controlled from the PLC: "PLC axis" state.
Note
Per machine data, the axis interchange to the PLC can be exclusively restricted to axes that
are permanently assigned to the PLC: MD10722 $MN_AXCHANGE_MASK, Bit 3 = 1
Parameter assignment
Parameterizing an axis as axis that is permanently assigned to the PLC is realized using the
axis-specific machine data:
MD30460 $MA_BASE_FUNCTION_MASK, Bit 5 = 1
Control by the PLC or NC channel
The traversing behavior of an axis permanently assigned to the PLC can either be influenced
by the NC channel or by the PLC:
NC channel: Channel-specific NC/PLC interface signals (selection)
● DB21, ... DBXDBX7.1 (NC start)
● DB21, ... DBXDBX7.3 (NC stop)
● DB21, ... DBXDBX7.7 (reset)
PLC: Axial NC/PLC interface signals
● DB31, ... DBX28.1 (reset)
● DB31, ... DBX28.2 (continue)
● DB31, ... DBX28.6 (stop along braking ramp)
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Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Extended Functions