Siemens SINUMERIK 840Di Function Manual page 1152

Detailed description
2.12 Block descriptions
The following specifications apply to the feed override, axis travel keys and INC keys
depending on the active mode or on the coordinate system selected:
• Feed override:
• Machine functions for INC and axis travel keys:
The handwheel selection signals from the MMC are decoded and activated in the
(machine) axis or the Geo axis interface of the handwheel selected (only if parameter
"HWheelMMC := TRUE" in FB 1).
The associated LEDs of the machine control panel are derived from the acknowledgments
from the relevant selections.
Feedrate and spindle Start/Stop are not transferred to the interface, but output modally as a
"FeedHold" or "SpindleHold" signal. The user can link these signals to other signals leading
to a feed or spindle stop (this can be implemented, e.g., using the appropriate input signals
in FC 10: AL_MSG). The associated LEDs are activated at the same time.
In the case of machine control panel failure, the signals it supplies are set to zero.
With SW V4 and higher, multiple calls of FC 25 or FC 19 are permitted within the same PLC
cycle. In this case, the first call in the cycle drives the LED displays. Furthermore, all actions
of the parameterized block are carried out in the first call. In the following calls, only a
reduced level of processing of the channel and mode group interface takes place. The
geometry axes are supplied with directional data only in the first block call in the cycle.
Single block processing can be selected/deselected only in the first cycle.
The second machine control panel can be processed if parameter ModeGroupNo has been
increased by B#16#10. When parameterizing, the HHU number is contained in the lower
nibble (lower 4 bits).
BAGNo = 0 or B#16#10 means that the mode group signals are not processed.
ChanNo = 0 means that the channel signals are not processed.
With SW 5 and higher, the INC selections of the override switch are only transferred to the
BAG group. This results in runtime improvements. The activation for this command is
performed by this block once after powerup via DB10.DBX 57.0. Machine control panels can
still be handled in parallel by this module. Support for of two MCPs is still provided within
certain restrictions in the control panel blocks (the standard software does not support axis
numbers 10 to 31, mutual interlocking of axis with two MCPs).
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– The feed override is transferred to the interface of the selected channel and to the
interface of the axes.
– The feed override signals are transferred in addition to interface byte "Rapid traverse"
override (DBB 5) to the NC channel if MMC signal "Feed override for rapid traverse
effective" is set (exception: Switch setting "Zero"). "Rapid traverse override effective" is
also set with this MMC signal.
– When the MCS is selected, the signals are transferred to the interface of the selected
machine axis.
– When the WCS is selected, the signals are transferred to the geoaxis interface of the
parameterized channel.
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0