Siemens SINUMERIK 840D sl Function Manual page 1514

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 of the HMI are decoded and activated in the associated
machine-axis interface or geo axis interface of the relevant handwheel (only if FB 1
parameter "HWheelMMC": = TRUE").
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.
If the machine control panel fails, the signals it outputs are preset to zero; this also applies to
"FeedHold" and "SpindleHold" output signals.
Multiple calls of FC 25 or FC 19, FC 24, FC 26 are permitted in a single 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.
Flexible axis configuration
It is possible to be flexible in the assignment of axis selections or direction keys for machine
axis numbers.
Better support is now provided by the MCP blocks for the use of two MCPs, which are to run
in parallel, in particular for an application using two channels and two mode groups. The
module 2 call for the 2nd machine control panel in OB1 cycle must come after the call of the
1st MCP Note that the axis-numbers are also specified in the parameterized mode group
number of the MCP block in the axis tables of the relevant MCP.
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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 to the NC channel in addition to the "Rapid
traverse override" (DBB 5) interface byte if the "Feed override for rapid traverse
effective" HMI signal is set (exception: Switch setting "Zero"). "Rapid traverse override
effective" is also set with this HMI 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.
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0