Siemens SINUMERIK 828D Function Manual page 1056

P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
• Feed override:
- 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.
- When the WCS is selected, the signals are transferred to the geo­axis interface of the parameterized
channel.
- When the system is switched between MCS and WCS, the active axes are generally deselected.
The handwheel selection signals from HMI 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.
The spindle direction (+, -) is not switched directly either, but made available as output parameter "SpindleDir".
permitting, for example, FC 18 to be parameterized. A spindle enable signal is also switched via parameter
"SpindleHold". One possible method of moving a spindle directly is to preselect it as an axis so that it can be
traversed via (axis) direction keys.
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 24 or FC 19, FC 25, 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 call in the 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. The activation for this specification is done via
the DB10.DBX57.0 (INC-inputs in BAG-area active) 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).
1056
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions