Axis Permanently Assigned To The Plc - Siemens SINUMERIK 840D sl Function Manual

K5: Channel synchronization, axis interchange
6.2 Axis replacement
Possible traversing functions
The following traversing functions are possible for axes exclusively controlled from the PLC:
1. Traversing in the JOG mode using the traversing keys and handwheel
2. Referencing the axis
3. Traversing as command axis via static synchronized actions
4. Traversing as asynchronous oscillating axis
5. Traversing as competing positioning axis from the PLC via FC18
After traversing functions 1. to 4. have been completed, the axis automatically goes back into
the "neutral axis" state. After traversing function 5. from the PLC has been completed, the axis
remains in the state "PLC axis". The axis only changes into the "Neutral axis" state after having
been explicitly released by the PLC.
6.2.10

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:
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions