Axis Interchange For Leading Axes (Gantry); State Diagram - Siemens SINUMERIK 840D sl Function Manual

6.2.13

Axis interchange for leading axes (gantry)

Function
A closed gantry grouping is treated regarding its axes always as a unit regarding axis
interchange. This is the reason why for an axis interchange of the leading axis, an axis
interchange is simultaneously made for all synchronous axes of the gantry grouping. In addition
to the preconditions for the leading axis described in the previous chapters, the appropriate
preconditions must also be fulfilled for all synchronous axes of the gantry grouping.
Axial machine data
For an axis interchange, the following axial machine data must be set the same for all axes of
a closed gantry group:
● MD30460 $MA_BASE_FUNCTION_MASK, Bit 4 (control executing components)
● MD30460 $MA_BASE_FUNCTION_MASK, Bit 5 (assignment to components)
Axial NC/PLC interface signals
Within the scope of the axis interchange function, the following axial NC/PLC interface signals
always have the same values for all axes of a closed gantry grouping:
● DB31, ... DBX63.0 (reset executed)
● DB31, ... DBX63.1 (PLC controlled axis)
● DB31, ... DBX63.2 (axis stop active)
Axial system variable
Within the scope of the axis interchange function, the following axial system variables always
have the same values for all axes of a closed gantry group:
● $AA_AXCHANGE_TYP (axis type regarding axis interchange)
● $AA_AXCHANGE_STAT (axis status regarding axis interchange)
● $AA_SNGLAX_STAT (axis type of the individual axis)
6.2.14

State diagram

The following figure shows the states, events, actions, and state transitions for an axis for
channel 1 in relation to the "axis replacement" function.
For channel 2, the sub-states "neutral axis" and "PLC axis" are not shown for clarity's sake.
Assumption: The axis is assigned to channel 1 by default:
MD30550 $MA_AXCONF_ASSIGN_MASTER_CHAN[<axis>] = 1
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
K5: Channel synchronization, axis interchange
6.2 Axis replacement
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