Siemens SINUMERIK 840D sl Function Manual page 776

P2: Positioning axes
11.3 Motion behavior and interpolation functions
4. NCK executes an axial RESET in accordance with use case 4 "Reset axis/spindle" by
5. NCK confirms the takeover and transfers the axis status to the PLC via the axial VDI
6. The channel now has control over the axis/spindle.
Alternatives
The NCK confirms the transfer and internally sets the "stopped" channel status for the
axis/spindle if it detects that:
● the axis-control channel is in the "interrupted" status owing to a stop signal,
● a stop alarm is active for the channel or
● a stop alarm is active for the mode group.
Marginal conditions
The axis/spindle must be operating under PLC control.
The NCK confirms acceptance of an axis/spindle only if an axial alarm is not active. If an
axial alarm is active, alarm 26074 "Channel %1 Deactivation of PLC control of axis %2 in
current status not permitted" is generated.
Applications
An axis/spindle interpolated by the main run can be controlled by the PLC independently of
the NC program via the following VDI interface signals:
● Cancel operation:
● Stop axis/spindle:
776
reading and activating the required reset machine data for RESET for a single axis.
interface with the NC/PLC-interface signals:
DB31, ... DBX63.1 (PLC controls axis) == 0
DB31, ... DBX63.2 (Axis stop active) == 0
DB31, ... DBX63.0 (AXRESET DONE) == 0
Axis status active with system variable $AA_SNGLAX_STAT == 0.
DB21, ... DBX6.2 (delete distance-to-go)
DB31, ... DBX28.6 (AxStop, stop)
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions