Siemens SINUMERIK 840D sl Function Manual page 1517

Transfer of HMI signals to the interface can be deactivated by setting the value of the
parameter "MMCToIF" to "FALSE" in FB 1 (DB 7).
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:
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 LEDs on the machine control panel derived from the selections in the acknowledgment.
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.
Multiple calls of FC 26 or FC 19, FC 24, FC 25 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.
The INC selections are transferred to the mode group interface. This specification is
activated via the DB10, ... DBX 57.0 through this block once after power-up. Furthermore,
two machine control panels can be handled in parallel by this block. The module 2 call for
the 2nd machine control panel in OB1 cycle must come after the call of the 1st MCP Support
for two MCPs is provided in the control panel blocks up to certain limits (support is not
provided as standard for mutual interlocking of axis selections with identical assignments on
two MCPs).
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
– 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.
Machine functions for INC and axis travel keys:
– When the MCS is selected, the signals are transferred to the interface of the selected
machine axis (for 6 axes).
– When the WCS is selected, the signals of the first three axes are transferred to the
Geo axis interface of the parameterized channel. The remaining three axes are
transferred to the interface of the selected machine axis.
Detailed description
2.12 Block descriptions
243